#include <stdio.h>
#define M 2
#define N 3
int main() {
  int a[M][N] = {{16, 8, -3}, {5, 10, 2}};
  int b[M][N] = {{4, -7, 3}, {4, 5, 113}};
  int c[M][N];
  int i, j;
  for (i = 0; i < M; i++) {
    for (j = 0; j < N; j++) {
      c[i][j] = a[i][j] - b[i][j];
    }
  }
  printf("a = \n");
  for (i = 0; i < M; i++) {
    for (j = 0; j < N; j++) {
      printf("%2d ", a[i][j]);
    }
    putchar('\n');
  }
  putchar('\n');
  printf("b = \n");
  for (i = 0; i < M; i++) {
    for (j = 0; j < N; j++) {
      printf("%2d ", b[i][j]);
    }
    putchar('\n');
  }
  putchar('\n');
  printf("c = \n");
  for (i = 0; i < M; i++) {
    for (j = 0; j < N; j++) {
      printf("%2d ", c[i][j]);
    }
    putchar('\n');
  }
  putchar('\n');
  return 0;
}
/* end */

a = 
16  8 -3 
 5 10  2 

b = 
 4 -7  3 
 4  5 113 

c = 
12 15 -6 
 1  5 -111