#include <stdio.h>

// Elements in a row are consecutive
// But compiler needs to know how many columns there are per row, 
// so it knows how to skip to the i th row
void modify(int rows, int cols, int c[][cols]) {

  int i,j;

  for (i=0; i < rows; i++) {
    for (j=0; j < cols; j++) {
      c[i][j] = 10*i+j;
    }
  }

}


int main() {

  int rows = 3;
  int cols = 3;
  int c[rows][cols];
  int i,j;

  for (i=0; i < rows; i++) {
    for (j=0; j < cols; j++) {
      c[i][j] = 0;
    }
  }

  modify(i,j,c);

  for (i=0; i < rows; i++) {
    for (j=0; j < cols; j++) {
      printf("%4d ", c[i][j]);
    }
    printf("\n");
  }

  return 0;
}