Passing a 2d array to a function, using the pointer to a 2D array Hi, I am trying to make a program, a read from the keyboard a 2d array and print his elements. The image below depicts a two-dimensional array. sizeof(T[n]) is equivalent to n * sizeof(T). 1. However, You can pass a pointer to an array by specifying the array's name without an index. This post is an extension of How to dynamically allocate a 2D array in C? I'm new to C and I'm learning pointers. The last program deals with an array of fixed sizes. An array type is represented as T[n], where T represents the element type and n represents the array's positive size, or the total number of elements, like: The element type and size are products of the array type. There are three ways to pass a 2D array to a function Specify the size of columns of 2D array void processArr (int a [] [10]) { // Do something } Pass array containing pointers We have learned that in chapter Two Dimensional Array in C that when a 2-D is passed to a function it is optional to specify the size of the left most dimensions. 4) Using a single pointer In this method, we must typecast the 2D array when passing to function. float calculateSum(float num []) { . If you don't know typedef see this article, application of typedef. Home > C++ > Pass 2D Array to Function in C++. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Fundamentals of Java Collection Framework, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam. Second answer now that you have dug a bit. By using a pointer, an array can be passed to the function if it has a variable size and if the size is known during the compile time. I would recommend to not use a C-style array in this particular case and use std::array instead. Expand | Select | Wrap | Line Numbers #include <stdio.h> void print (int *arr, int m, int n) { int i, j; for (i = 0; i < m; i++) And, also we can return arrays from a function. Import library package iostream and define the namspace as std. Hence we can also declare a function where the formal argument is of type pointer to an array. Note that the printing code reverses the order of the subscripts compared to your code. The below example demonstrates the same. Inside the main function, a two-dimensional array arr1 is created and initialized with some key pair values. We have learned that in chapter Two Dimensional Array in C that when a 2-D is passed to a function it is optional to specify the size of the left most dimensions. Passing a 2D Array as a Function Parameter in C and C++ | by Shriya Madan | The Startup | Medium Write Sign up Sign In 500 Apologies, but something went wrong on our end. Hence let us see how to access a two dimensional array through pointer. 2 3 4 5 6 We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. void printMatriz(int (*matriz)[TAM][TAM]). For Static Array Passing 2D array to function using pointer 0.00/5 (No votes) See more: C++ Hi I am getting and error while passing 2d array to function. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. A one dimensional array can be easily passed as a pointer, but syntax for passing a 2D array to a function can be difficult to remember. Even though we do not create a reference variable, the compiler passes the pointer to the array, making the original array available for the called function's use. Algorithm Begin The 2D array n[][] passed to the function show(). Here is my code C# Expand The parenthesis in the type int(*)[8] are vital if you are unfamiliar with the C declarator syntax: Inside the method, the contents of the array are printed using a for loop inside a while loop. These are declared only once in the program, eliminating the risk of dimension checks. Ready to optimize your JavaScript with Rust? Let's create a program that decays the array to pass its information. Thats the only way we can improve. Before venturing toward the program, let's first understand what is a decaying pointer. Inside the main function, a two-dimensional array is created with the same dimension as the one in the func method. Refresh the. For example, an array of two rows and 3 columns is technically a one-dimensional array of two elements, where each element is a one-dimensional 3 elements array. Note: An array is not a pointer, thus declaring it needs a little know-how for the programmer. To pass a 2D array to a function proceed as follows 1. The examples will also describe ways to remove extensions as well if such needs arise. Thanks for contributing an answer to Stack Overflow! Not sure if it was just me or something she sent to the whole team. 12345 If compiler is not C99 compatible, then we can use one of the following methods to pass a variable sized 2D array.4) Using a single pointerIn this method, we must typecast the 2D array when passing to function. The following program answers this question. A 2-D array is actually a 1-D array in which each element is itself a 1-D array. So the base type of my_arr is a pointer to int or (int *).Hence the formal argument of a function can be also be declared as pointer to . Let us know if you liked the post. It is hoped that this article helped in your learning journey. It can be of any type like integer, character, float, etc. Now that I did it, it keeps displaying the warning, here is the code now, i put void printMatriz(int (*matriz)[TAM][TAM]) and it still keeps displaying the warning, though it's working as well. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? Ways to Pass a 2D Array to function in C++ How to insert an item into an array at a specific index (JavaScript), Sort array of objects by string property value. Passing arrays to functions in C/C++ are passed by reference. Table of ContentsAccuracy V/S Precision in Counting Decimal Places in C++ ProgramsHow to Count Decimal Places in C++Example 1: Use String Functions to Find Precise Number of Decimal PlacesExample 2: Count Decimal Places Accurately for a NumberExample 3: Create a Program that divides two numbers and returns their decimal placesExample 4: Find the Number of [], Table of ContentsWays to Check if String Is Empty in C++Using Empty() methodUsing the Equality OperatorUsing length() methodUsing size() methodConclusion A String is a combination of characters that can store both alphabets and numbers together. Pass 2D array to a function as a parameter in C This post will discuss how to pass a 2D array to a function as a parameter in C. In the previous post, we have discussed how to allocate memory for a 2D array dynamically. If compiler is not C99 compatible, then we can use one of the following methods to pass a variable sized 2D array. Call function show() function, the array n (n) is traversed using a nested for loop. By using this site, you agree to the use of cookies, our policies, copyright terms and other conditions. Inside the method, the method name and the contents of the array are printed. as others have stated, your function is defined as taking an argument of a 2d array of pointers to integers int * matrix [] [], and since the name of the array is itself a pointer to the beginning of that array, the function wants a pointer to a pointer (remember the first element of int * matrix [] [] will be a pointer to an int) but then you This post will discuss how to pass a 2D array to a function as a parameter in C. In the previous post, we have discussed how to allocate memory for a 2D array dynamically. It works, but i am not so sure is very good, because when i compile, take a while and it finish with a delay. The program does not lose its dimension because the reference of the array gets passed to the method. You can, however, pass a pointer to an array without an index by specifying the array's name. If we know the array bounds at compile-time, we can pass a static 2D array to a function in C, as shown below: Output: Why is the eastern United States green if the wind moves from west to east? Passing array of objects as parameter in C++, Difference between Argument and Parameter in C/C++ with Examples. This post will discuss how we can pass a 2D array to a C programming language function. No need to mark it as a pointer. Whats difference between array and &array for int array[5] ? Array can be passed to function in C using pointers, and because they are passed by reference, changes made on an array will also be reflected on the original array outside the function scope. depending on the initialization. How do I check if an array includes a value in JavaScript? How can I remove a specific item from an array? 34567 Essentially in all the three cases discussed the type of the variable a is a pointer to an array of 3 integers, they differ only in the way they are represented. As others have stated, your function is defined as taking an argument of a 2D array of pointers to integers int * matrix[][], and since the name of the array is itself a pointer to the beginning of that array, the function wants a pointer to a pointer (remember the first element of int * matrix[][] will be a pointer to an int) but then you pass . How to deallocate memory without using free() in C? 5) Using the concept of pointer to an array, References:http://www.eskimo.com/~scs/cclass/int/sx9a.htmlThis article is contributed by Abhay Rathi. This website uses cookies. Submitted by IncludeHelp, on March 22, 2018 Given a two dimensional array and we have to pass it to the function in C. Read our, // Here the parameter is a static 2D array, // Program to pass the 2D array to a function in C, // Here, the parameter is an array of pointers, // dynamically create an array of pointers of size `m`, // dynamically allocate memory of size `n` for each row, // Here, the parameter is a dynamic 1D array, // Here, the parameter is a pointer to a pointer, // dynamically allocate memory of size `mn` and let *arr point to it, // position allocated memory across `m` pointers. This post is an extension of How to dynamically allocate a 2D array in C? These 2D matrices cannot be passed directly to functions like single-dimension arrays. You can pass a pointer to the first element of the 2D array and access all the elements using that pointer like so: In your main function you would do something like this: I managed to make it work, but I still get the following warning: Your warnings are stemming from a misunderstanding of how you defined your function and then what you passed it. C++ C #include <iostream> using namespace std; Two-dimensional arrays have rows and columns, storing data inside this matrix. this pointer ptr points to the starting block of the array A. You can, however, pass the address of the first element to a function, or use an intermediary "row array". Passing 2d array to function in C using pointers: The first element of the multi-dimensional array is another array, so here, when we will pass a 2D array then it would be split into a pointer to the array. 1 2 3 4 5 To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The second (and any subsequent) dimensions must be given1) When both dimensions are available globally (either as a macro or as a global constant). Making statements based on opinion; back them up with references or personal experience. When do we pass arguments by reference or pointer? So if we have an array of 2 rows and 3 dimensions then it can be passed to a function in the following two ways: 1 2 3 4 int two_d[2] [3] = { {99,44,11}, {4,66,9} }; 1st way: 1 2 3 4 How to dynamically allocate a 2D array in C? C Programming - Passing a multi-dimensional array to a function Watch on In C, a two-dimensional array is a one-dimensional array of one-dimensional arrays. But before we study this, I want to make a few points clear. Okay let's get back to our original discussion - Why the changes made by the function effect the original array? Re: Passing a 2d array to a function, using the pointer to a 2D array Posted 11 June 2021 - 05:04 AM Your parameter: int (*piData) [ARRAY_ROW] [ARRAY_COL] should just be: int rgnData [ARRAY_ROW] [ARRAY_COL] The an array already automatically devolves into a pointer. The reader after going through this article will easily create programs that pass two dimensional arrays to its methods. If it's a problem, reinstate the variable definitions outside the loops. C program to pass two dimensional array (Two-D array) to a function Here, we have a C program, in which we are demonstrating an example of passing two dimensional arrays to a function. 0 1 2 3 4 The program needs to follow some required rules. A whole array cannot be passed as an argument to a function in C++. Also, the name of the array i.e A just returns a pointer to the first element of the array. How to make voltage plus/minus signs bolder? Import package iostream and define namespace as std. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. The pointer to the entire array points to an array of six integers(depicted as a large box), whereas the pointer to the first element only points to a single integer (seen as a little box). We are sorry that this post was not useful for you! What is if __name__ == '__main__' in Python ? Do NOT follow this link or you will be banned from the site. Lets create a program that passes the array by passing its pointer. Subscribe now. This method provides some safety as passing an incorrect value of rows will cause the compiler to flag the values. This post will discuss how we can pass a 2D array to a C programming language function. How to pass a 2D array as a parameter in C? So, I need some help. Hebrews 1:3 What is the Relationship Between Jesus and The Word of His Power? It actually works because, AFAIK, a statically allocated 2D array is a single contiguous memory region. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? These 2D matrices cannot be passed directly to functions like single-dimension arrays. A two-dimensional array in C++ is the simplest form of a multi-dimensional array. There are two ways to pass dynamic 2D array to a function: 1) Passing array as pointer to pointer( int **arr) Using new operator we can dynamically allocate memory at runtime for the array. 4 5 6 7 8. The above method is fine if second dimension is fixed and is not user specified. The only "connection" between T[n] and T[m] is that both types can implicitly be transformed to T*, with the result being a pointer to the array's first element. Despite being completely different types, a pointer to an object and a pointer to its first data member has the same value (the same location). 01234 Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above, Data Structures & Algorithms- Self Paced Course. In this program, a function func is created having a single parameter int(*array)[3][3] which is a pointer to a two-dimensional array having three rows and three columns each. Be the first to rate this post. Note: It is not mandatory to specify the number of rows in the array. The declaration int(*arr)[4] can also be written as int array[][4]. Just like a 1-D array, when a 2-D array is passed to a function, the changes made by function effect the original array. I managed to make it work, but I still get the following warning: First Answer Now that you have struggled Difference Between malloc() and calloc() with Examples, Dynamic Memory Allocation in C using malloc(), calloc(), free() and realloc(). This conversion, referred to as "array-to-pointer decay," removes the value inside the first index of the array, which stores the address. Passing Array to a Function we can pass arrays as an argument to a function just like we pass variables as argument. array::front() and array::back() in C++ STL. When the array bounds are not known until runtime, we can dynamically create an array of pointers and dynamically allocate memory for each row. This article explains the various method to pass a 2D matrix to a method in C++. Find centralized, trusted content and collaborate around the technologies you use most. If the a [] was dynamically allocated, though, your code can easily crash. When reading such definitions start on the deepest name and spiral out starting up and to the right, honoring precedence. 23456 With arrays, why is it the case that a[5] == 5[a]? For example, If int aiData [3] [3], is a 2D array of integers, it would be split into a pointer to the array of 3 integers (int (*) [3]). By using our site, you The function takes a two dimensional array, int n [] [2] as its argument and prints the elements of the array. That's an array of one-dimensional arrays. Enter your email address to subscribe to new posts. Since the array's size is no longer a component of the type (T*), it is lost during this procedure. Counterexamples to differentiation under integral sign, revisited, name matriz is (spiraling out within parentheses) a pointer to. Installing GoAccess (A Real-time web log analyzer). While calling the function, we only pass the name of the two dimensional array as the function argument display (num). To pass an entire array to a function, only the name of the array is passed as an argument. Get Filename From Path in C++ Finding [], In this post, we will see how to escape percent sign in printf Method in C++. To access nth element of array using pointer we use * (array_ptr + n) (where array_ptr points to 0th element of array, n is the nth element to access and nth element starts from 0). The below ASCII diagram explains how the compiler differentiates between index and pointers. The following methods handle cases when second dimension can also change.3) If compiler is C99 compatibleFrom C99, C language supports variable sized arrays to be passed simply by specifying the variable dimensions (See this for an example run). It seems like you are treating your 2D array as a 1D array and using index conversion from a 2D access pattern to a 1D one. Passing 2D array to function via pointer of pointer I have been using a pointer of pointer to dynamically allocate memory for a 2D array but my question is whether I then pass a 2D array to function using a pointer of pointer representation of this array? New operator returns the address of the space allocated .This method Passes array reference as double pointer to the function along with rows and columns. 45678. It can be visualized as an array of arrays. Working from inside out, starting with name: Hoping there is not too much sleep in my eyes. The object interaction becomes more interesting when we add runtime polymorphism to it. The while loop iterates three times and for each iteration of i, the for loop iterates three times. End Example Code. In the case of a 2-D array, 0th element is an array. Lastly, the function func_decay_pointer is called by passing the array and the value of row as an argument. That's not a 2-dimensional matrix. This will only work if the array is passed after the indices to the function. Did the apostolic or early church fathers acknowledge Papal infallibility? for example, In C, when we pass an array to a function say fun (), it is always treated as a pointer by fun (). In C++, this drawback [], Table of ContentsGet Filename From Path in C++Using find_last_of and substr methodsUsing TemplatesUsing filesysystem library [ C++ 17 ]Conclusion This article explains the various ways to get filename from path using C++ programs. Does balls to the wall mean full speed ahead or full speed ahead and nosedive? In C, there was no concept of string as a datatype so character arrays were used. Disconnect vertical tab connector from PCB. There is a way to pass stack-based arrays of a known size "by reference" accepting a certain size: void MyFunc (int (&theArray) [4]); This only accepts a size 4 array. One important thing for passing multidimensional arrays is, first array dimension does not have to be specified. To make it a pointer you need to enclosed it within parentheses. The size of the array remains fixed throughout the program unlike the dynamic arrays, and thus does not requires the compiler to check for dimension mismatch. Now we know two dimensional array is array of one dimensional array. In the previous chapter, we have already discussed that the name of a 1-D array is a constant pointer to the 0th element. Not the answer you're looking for? Your email address will not be published. So arr is an array of 3 elements where each element is a 1-D array of 4 integers. [], Table of ContentsWhy Should We Determine the Type of Object in C++: Dynamic DispatchingGet Type of Object in C++Conclusion C++ is an object-oriented language where we often interact with objects of different types. Your array is of type int [2] [2] ("array of 2 array of 2 int") and its name will decay to a pointer to its first element which would be of type int (*) [2] ("pointer to array of 2 int"). 3 4 5 6 7 2D Array Representation A two-dimensional array is also called a matrix. This can be done both statically and dynamically, as shown below: If the function parameter is a pointer to a pointer, we can do something like: Thats all about passing a 2D array to a function as a parameter in C. Pass 2D array as a function parameter in C++. Thus, if the function modifies the array, it will be reflected back to the original array. Arrays can be returned from functions in C using a pointer pointing to the base address of the array or by creating a user-defined data type using struct. The syntax is non-obvious. Since the size is a component of the type, array types with different sizes are incompatible and unrelated to one another. Japanese girlfriend visiting me in Canada - questions at border control? It gives me following error error C2664: cannot convert parameter 1 from int [3] [4] to int* I am not able to figure out where i am making mistake. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? To learn more, see our tips on writing great answers. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Why are you claiming that the function receives a matrix of, i forgot to declare it as a pointer. And If you're using C++ and don't really need to use a char**, you just . Decaying a pointer is useful when the programmer forgets the dimension and can decay it to point to its first element, but at the same time, its size is lost in the process. If he had met some scary fish, he would immediately return to the surface, Received a 'behavior reminder' from manager. Let's create a program that passes the array to its method by passing the reference. Using the latter statement is legal but can confuse programmers as some may take it as a two-dimensional array whereas it is still a single-pointer integer array having 4 elements. An array-like int arr[5] represented in an ASCII diagram looks like this: Suppose two arrays T[m] and T[n] are created. The name of the method and the contents of the array are printed using nested for loops, simmilar to what we did in previous program. In the next section, we will directly pass an array using a concept called decayed array pointers. Access 2d array using a pointer to an array We can easily access a 2D array with the help of a pointer to the array. C++ does not allow to pass an entire array as an argument to a function. This way an array can be directly passed to the function without the need to pass its address but doing so will force the compiler to decay it into a pointer and delete its 0th index. Can virent/viret mean "green" in an adjectival sense? If you are passing a two dimensional array to a function, you should either use square bracket syntax or pointer to an array syntax but not double pointer. rev2022.12.9.43105. Is it appropriate to ignore emails from a student asking obvious questions? To combat it, we need to pass the number of rows as a separate argument. Better way to check if an element only exists in one array. Therefore, from this discussion, we can conclude that two_d is a pointer to an array of 3 integers. And it's a hugely inefficient way to allocate an array. Pass a 2D Array to a Function in C++ Without Size by Passing Its Reference Conclusion Two-dimensional arrays have rows and columns, storing data inside this matrix. We can even use a 1D array to allocate memory for a 2D array. A function func_decay_pointer is created which has two parameters a single pointer integer array arr of size 4 and another variable rows of type size_t. Core Java Tutorial with Examples for Beginners & Experienced, A pointer to an array of 6 elements is denoted by . Asking for help, clarification, or responding to other answers. This article explains how to pass two dimensional array to a function using three different method. .. } This informs the compiler that you are passing a one-dimensional array to the function. Ways to Pass a 2D Array to function in C++, Pass a 2D Array to a Function by Passing Its Pointer, Pass 2D array to fiunction using pointers, Pass an Array to the Function by Decaying the Pointer to the Array, // int is Type of array and 10 is the size, // Value of row is passed as an argument along with the array, Pass a 2D Array to a Function in C++ Without Size by Passing Its Reference. 2) When only second dimension is available globally (either as a macro or as a global constant). This program uses two individual variables for rows and columns of the 2D array and then uses those variables for the size of the array. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Get quality tutorials to your inbox. When I make debug I obtain a segmentation fault. Understanding volatile qualifier in C | Set 2 (Examples), Left Shift and Right Shift Operators in C/C++, http://www.eskimo.com/~scs/cclass/int/sx9a.html. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Output. Then we can pass the array of pointers to a function, as shown below: Output: Two nested for loops print the contents, where the first loop iterates up to the value of variable rows and the second loop iterates for the number of columns. In our case my_arr is a pointer to 0th element of the array, in other words, my_arr points to the address of element 11. Result = 162.50. How to print size of array parameter in C++? In this program, we will perform to display the elements of the 2 dimensional array by passing it to a function. The reason to use a separate variable for rows instead of using a 2D array is that the compiler will decay the first index when this array will get passed. The runtime polymorphism, also known as, dynamic dispatch of [], Your email address will not be published. To avoid losing size, we store the size of rows separately. One important thing for passing multidimensional arrays is, first array dimension does not have to be specified. result = calculateSum (num); However, notice the use of [] in the function definition. Passing 2D Array to Function in C Language using Pointer Notation - C Programming Tutorial 113 - YouTube 0:00 / 36:56 C Programming Tutorials Passing 2D Array to. Extended my answer now that you dug a little into the code. Having no size(fixed size) eliminates the risk of dimension mismatch and the dimensions are provided right at the compile time. So if we have an array of 2 rows and 3 dimensions then it can be passed to a function in the following two ways:if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'overiq_com-medrectangle-3','ezslot_3',149,'0','0'])};__ez_fad_position('div-gpt-ad-overiq_com-medrectangle-3-0'); Recall that 2-D arrays are stored in row-major order i.e first row 0 is stored, then next to it row 1 is stored and so on. In the chapter Pointers and 1-D arrays, we have also learned that name of the array is a constant pointer to the 0th element of the array. In the case, of a 2-D array, 0th element is a 1-D array. You can afford to use far fewer asterisks, like this. Passing an array to a function will decay the array to a pointer to the first element of the array--in the case of a 2d array it decays to a pointer to the first row because in C arrays are sorted row-first. So, I want to pass the pointer of a 2d array. When all of the array's dimensions are fixed and known at compile time, use this approach because the compiler flags dimensions in events of mismatch. As discussed earlier in this section that two_d and arr are of type pointer to an array of 3 integers. In this tutorial, we will learn how to pass a single-dimensional and multidimensional array as a function parameter in C++ with the help of examples. With the pointer declared we can use pointer arithmetic and dereferencing to access the address and elements of the array. In other words, you can use a T[n] whenever a T* is needed, and the compiler will quietly provide that pointer. Therefore in C, a 2-D array is actually a 1-D array in which each element is itself a 1-D array. Note: The first two programs deal with an array of varied sizes, which means the scope of these arrays is localized and needs to be declared more than once and the compiler has to check them for dimension mismatch. Are there breakers which can be triggered by an external signal and have to be reset by hand? If we dont know the array bounds at compile-time, we need to pass the array bounds to the function, as shown below. Live Demo Note that this uses C99 notation for the for loops, avoiding the need for the variables i and j outside the loops. The program needs to follow some required rules. Connect and share knowledge within a single location that is structured and easy to search. Now both two_d and arr points to the same 2-D array, as a result, changes made inside the function will be visible in the function main().if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'overiq_com-medrectangle-4','ezslot_6',136,'0','0'])};__ez_fad_position('div-gpt-ad-overiq_com-medrectangle-4-0'); // signal to operating system everything works fine, Operator Precedence and Associativity in C, Conditional Operator, Comma operator and sizeof() operator in C, Returning more than one value from function in C, Character Array and Character Pointer in C, Machine Learning Experts You Should Be Following Online, 4 Ways to Prepare for the AP Computer Science A Exam, Finance Assignment Online Help for the Busy and Tired Students: Get Help from Experts, Top 9 Machine Learning Algorithms for Data Scientists, Data Science Learning Path or Steps to become a data scientist Final, Enable Edit Button in Shutter In Linux Mint 19 and Ubuntu 18.04, Installing MySQL (Windows, Linux and Mac). Passing 2d array to a function in C with pointers. It should be. Vector of Vectors in C++ STL with Examples, Sort in C++ Standard Template Library (STL). Escape percent sign in Printf Method in C++ printf() method uses percent sign(%) as prefix of format specifier. If you really want to use pointers to matrices, you could use either of these two variants of your code: Note the different notations needed in the last example in the call (like in your original code) and in the use of the matrix. Save my name, email, and website in this browser for the next time I comment. As coder777 says, you can pass a 1-dimensional array, even though you can't pass a 2D array via a double pointer. Lastly, this array is passed to the function. We have seen how the passing pointer of the array can pass an array to a function. Arrays can be passed to a function as an argument. Passing 2-D array to a function seems tricky when you think it to pass as a pointer because a pointer to an array and pointer to a pointer (double pointer) are two different things. First, we need to define a new type for the 2d array using the typedef that helps you to avoid the complex syntax. For example: To use number in prinf() method, we use %d, but what if you actually want to use percent sign [], Table of ContentsWays to Remove Last Element from Vector in C++Using the vector::pop_back() function to remove last element from vector in C++Using the vector::resize() Function to Remove Last Element from Vector in C++Using the vector::rrase() Function to Remove Last Element from Vector in C++Conclusion Learn about how to remove last element from Vector in C++. So your func needs to take an argument of this type: void func (int (*ptr) [2]); // equivalently: // void func (int ptr [] [2]); As others have stated, your function is defined as taking an argument of a 2D array of pointers to integers int * matrix[][], and since the name of the array is itself a pointer to the beginning of that array, the function wants a pointer to a pointer (remember the first element of int * matrix[][] will be a pointer to an int) but then you pass it &matrix which is int * (a pointer to an int) because the first element of the 2D array matrix is an int. 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