Is there any way of passing 2D array to a function without knowing any of its dimensions?

Is there any way of passing 2D array to a function without knowing any of its dimensions?

You can’t have a 2D array with unspecified dimensions. However, it seems that you have a C99+ compiler and therefore can use a variable-length array.

How do you pass a 2D array size in a function?

int n = 5;

1. int *arr = (int *)malloc(m * n * sizeof(*arr));
2. assign(arr, m, n);
3. // print 2D array. for (int i = 0; i < m; i++)
4. for (int j = 0; j < n; j++) { printf(“=”, arr[i * n + j]);

How do you pass a 2D array to a function in C++?

There are three ways to pass a 2D array to a function:

1. The parameter is a 2D array int array[10][10]; void passFunc(int a[][10]) { //
2. The parameter is an array containing pointers int *array[10]; for(int i = 0; i < 10; i++) array[i] = new int[10]; void passFunc(int *a[10]) //Array containing pointers { // …

Can we declare 2D array without size?

Is it possible to initialize a multi dimensional array without first initializing its size? => No, it is not possible. The thing possible is that you take the size of the array and then allocate memory using calloc.

How do you declare a 2D array?

To declare a 2D array, specify the type of elements that will be stored in the array, then ( [][] ) to show that it is a 2D array of that type, then at least one space, and then a name for the array. Note that the declarations below just name the variable and say what type of array it will reference.

How do you initialize a 2D array using memset?

If the 2D array has automatic storage duration, then you can use an array initializer list to set all members to zero. int arr[10][20] = {0}; // easier way // this does the same memset(arr, 0, sizeof arr); If you allocate your array dynamically, then you can use memset to set all bytes to zero.

How to pass a 2D array as a parameter in C?

If compiler is not C99 compatible, then we can use one of the following methods to pass a variable sized 2D array. In this method, we must typecast the 2D array when passing to function. This article is contributed by Abhay Rathi.

When do you need to pass multidimensional arrays?

One important thing for passing multidimensional arrays is, first array dimension does not have to be specified. The second (and any subsequent) dimensions must be given 1) When both dimensions are available globally (either as a macro or as a global constant).

How to pass an array to a function?

The way to pass such arrays to a function depends on the way used to simulate the multiple dimensions: 1) Use an array of arrays. This can only be used if your array bounds are fully determined at compile time, or if your compiler supports VLA’s:

When to use second dimension as a parameter?

2) When only second dimension is available globally (either as a macro or as a global constant). The above method is fine if second dimension is fixed and is not user specified. The following methods handle cases when second dimension can also change.