#include <stdio.h>
 **
int a[4][5] = {             // array of 4 arrays of 5 ints each, a 4x5 matrix
    { 1, 2, 3, 4, 5 },      // row 0 initialized to 1, 2, 3, 4, 5
    { 6, 7, 8, 9, 10 },     // row 1 initialized to 6, 7, 8, 9 ...
};                          // rows 2 onwards  initialized to zeros
 **
int main() {
  int *p = a;
  for(int i=0; i < 20; i++)
    printf("%d, ", *p++);
  printf("\b\b \n");       // erasing the trailing comma and adding a newline
  return 0;
}