/*array.c						*/
/*an multi-dimensional array example			*/
/*Author: Weiwei Chen					*/
/*Date: Nov. 7. 2010					*/

#include <stdio.h>

int findmax(int p[3][2]);
int findmin(int p[3][2]);
void modify_pv(int p, int newvalue);
void modify_pr(int p[3][2], int i, int j, int newvalue);

int main()
{
	int i, j, max, min;

	int ma[3][2] = {{1, 2}, {3, 4}, {5, 6}};


	/* display the content of the array */

	for(i = 0; i < 3; i ++)
	{
		for(j = 0; j < 2; j ++)
		{
			printf("ma[%d][%d] = %d \n", i, j, ma[i][j]);
		}
	}	

	/* find the maximum and minimum value in the array*/
	max = findmax(ma);
	min = findmin(ma);
	printf("the maximum value is: %d \n", max);
	printf("the minimum value is: %d \n", min);

	/* modify the content of the element ma[1][1] by passing as value*/
	printf("the value of ma[%d][%d] before modification is %d \n", 1, 1, ma[1][1]);
	modify_pv(ma[1][1], 100);	
	printf("the value of ma[%d][%d] after modification is %d \n", 1, 1, ma[1][1]);


	/* modify the content of the element ma[1][1] by passing as referenc*/
	printf("the value of ma[%d][%d] before modification is %d \n", 1, 1, ma[1][1]);
	modify_pr(ma, 1, 1, 100);	
	printf("the value of ma[%d][%d] after modification is %d \n", 1, 1, ma[1][1]);

	return 0;

}

int findmax(int p[3][2])
{
	int max = p[0][0];
	int i, j;

	for(i = 0; i < 3; i ++)
	{
		for(j = 0; j < 2; j ++)
		{
			if(max < p[i][j])
			{
				max = p[i][j];
			}
		}
	}
	return max;
}


int findmin(int p[3][2])
{
	int min = p[0][0];
	int i, j;

	for(i = 0; i < 3; i ++)
	{
		for(j = 0; j < 2; j ++)
		{
			if(min > p[i][j])
			{
				min = p[i][j];
			}
		}
	}
	return min;
}

void modify_pv(int p, int newvalue)
{
	printf("the original value of p is %d \n", p);
	p = newvalue;
	printf("the new value of p is %d \n", p);
}


void modify_pr(int p[3][2], int i, int j, int newvalue)
{
	printf("the original value of p[%d][%d] is %d \n", i, j, p[i][j]);
	p[i][j] = newvalue;
	printf("the new value of p[%d][%d] is %d \n", i, j, p[i][j]);
}