Passing 2D int array from one function to another in c

Question

For example, I have two functions: first one gets height and width from main() and reads 2D int array

int read_price (int height, int width) { 
  int i, j;
  int array[height][width];

  printf("Enter your values:\n");

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      scanf("%d", &array[i][j]); 
    }
  }
}

Second function gets values from the first and prints it.

void print_array () {
  int i, j;
  for (i = 0; i < h; i++) {
    for (j = 0; j < w; j++) {
      printf("%d ", array[i][j]);
    }
    printf("\n");
  }
}

And - the question! How should I call second function inside the first (with which arguments)? And which arguments should I write beetween brackets in the name of second function.

I tried to call in this (and some another) way(s), but I get errors.

print_array (array[height][width]);

Marian · Accepted Answer · 2016-11-28 14:38:59Z

5

In C99 you can use array with a variable length. In your case the definition of the function print_array will look like:

void print_array (int height, int width, int array[height][width]) {
  int i, j;
  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
        printf("%d ", array[i][j]);
    }
    printf("\n");
  }
}

and you will call it as:

print_array(height, width, array);

Because in C you are not sending arrays, just pointers, the previous definition is equal to a definition when you send a pointer (to an array of width integers) which you can define as:

void print_array (int height, int width, int (*array)[width]) {
   ...
}

edited Nov 28, 2016 at 14:38

answered Nov 28, 2016 at 14:30

Marian

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3 Comments

Dmytro O Over a year ago

Ok, but how should I pass args from the first function? print_array(height, width, array[][]); ? It throws error

Dmytro O Over a year ago

It seems to be a last question. I edited it, like it is in your answer, but firstly I similarly get errors. Then I tried to compile it in the terminal with gcc, but as .c file. It worked. Before that I compiled my code in Clion as .cpp. Is it normal?

Marian Over a year ago

I think that variable length arrays are not part of C++.

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