/* Define a 2-dimensional array and show modification of an element in the array 
   by pass by value and pass by reference
   Emad Arasteh
   November 15, 2018
*/

#include <stdio.h>

int find_min(int m[][5]);
int find_max(int m[][5]);
void modify_pv(int p, int update);
void modify_pr(int p[][5], int r, int c, int update);

int find_min(int m[][5]) {
  int min = m[0][0];
  int r, c;

  for (r = 0; r < 4; r++) {
    for (c = 0; c < 5; c++) {
      if (m[r][c] < min) {
	min = m[r][c];
      }
    }
  }
  return min;
}

int find_max(int m[][5]) {
  int max = m[0][0];
  int r, c;

  for (r = 0; r < 4; r++) {
    for (c = 0; c < 5; c++) {
      if (m[r][c] > max) {
	max = m[r][c];
      }
    }
  }
  return max;
}

void update_pv(int p, int update) {
  printf("The original value of p is %d \n", p);
  p = update;
  printf("The updated value of p is %d \n", p);
}

void update_pr(int p[][5], int r, int c, int update) {
  printf("The original value of p[%d][%d] is %d \n", r, c, p[r][c]);
  p[r][c] = update;
  printf("The updated value of p[%d][%d] is %d \n", r, c, p[r][c]);
}

int main() {
  int matrix[4][5] = {{10, 20, 30, 40, 50}, {0, -1, 20, 50, 5}, {24, 41, 55, 88, 56}, {32, 3, 10, 4, 2}};
  int r, c;
  int min, max;

  for (r = 0; r < 4; r++) {
    for (c = 0; c < 5; c++) {
      printf("matrix[%d][%d]: %d \n", r, c, matrix[r][c]);
    }
  }

  min = find_min(matrix);
  max = find_max(matrix);

  printf("The min value in the matrix is %d \n", min);
  printf("The max value in the matrix is %d \n", max);

  /* Update content of the matrix[1][1] by pass by value */
  printf("The value of matrix[1][1] before update is %d \n", matrix[1][1]);
  update_pv(matrix[1][1], 100);
  printf("The value of matrix[1][1] after update is %d \n", matrix[1][1]);

  /* Update content of the matrix[1][1] by pass by reference */
  printf("The value of matrix[%d][%d] before update is %d \n", 1, 1, matrix[1][1]);
  update_pr(matrix, 1, 1, 100);
  printf("The value of matrix[%d][%d] after update is %d \n", 1, 1, matrix[1][1]);

  return 0;
}