/* Example demonstrating using multi-dimensional arrays.
 * Shows how functions that pass arrays are pass-by-reference.
 * Note: bad programming style: duplicate code for printing matrix.
 * (Part of next lab.)
 * CISC105  07.11.05
 * mod_matrix.c
 */

#include<stdio.h>

#define SIZE 5

void modArray( int a[], int size ) {
  a[3] = 100;
}

void modMatrix( int a[][SIZE], int size ) {
  a[1][2] = -99;
}

int main() {
  int i, j;
  int matrix[SIZE][SIZE] = {0};

  printf("Matrix before modification: \n");
  for( i=0; i < SIZE; i++ ) {
    for( j=0; j < SIZE; j++ ) {
      printf("%4d", matrix[i][j]);
    }
    printf("\n");
  }

  modMatrix( matrix, SIZE );

  printf("Matrix after matrix modification: \n");
  for( i=0; i < SIZE; i++ ) {
    for( j=0; j < SIZE; j++ ) {
      printf("%4d", matrix[i][j]);
    }
    printf("\n");
  }

  modArray( matrix[2], SIZE );

  printf("Matrix after array modification: \n");
  for( i=0; i < SIZE; i++ ) {
    for( j=0; j < SIZE; j++ ) {
      printf("%4d", matrix[i][j]);
    }
    printf("\n");
  }
  
  return 0;
}