#include <stdio.h>
#define NUM 3

// prototype
void AddArrays(int [], int [], int []);

int main(void)
{
	// arrays
	int nAArray[NUM] = {1, 2, 3};
	int nBArray[NUM] = {4, 5, 6};
	int nSumArray[NUM] = {0, 0, 0};
	// counter and a nPtr that pointing to the first
	// element of nSumArray array
	int nCounter, *nPtr=nSumArray;

	// call AddArrays function
	AddArrays(nAArray, nBArray, nSumArray);

	printf("\nIn main():\n");
	// the nPtr pointer which pointed to nSumArray, having
	// new values, we reprint it
	printf("Sum of two arrays' elements is : { ");
	for(nCounter = 0; nCounter < NUM; nCounter++)
	{
		printf("%d ", *nPtr++);
	}
	printf("}\n");
	return 0;
}

// the arrays passed and modified by AddArrays() function
void AddArrays(int *nXArray, int *nYArray, int *nSumArrayArg)
{ 
	int nLocalCtr = 0;

	printf("In AddArrays() function:\n");
	for(;nLocalCtr<NUM; nLocalCtr++)
	{
		// add two arrays' elements and store result in nSumArrayArg array
		nSumArrayArg[nLocalCtr] = nXArray[nLocalCtr] + nYArray[nLocalCtr];
		// print some info
		printf("nXArray[%d] + nYArray[%d] = nSumArrayArg[%d]\n", nLocalCtr, nLocalCtr, nLocalCtr);
		printf("%d + %d = %d\n", nXArray[nLocalCtr], nYArray[nLocalCtr], nSumArrayArg[nLocalCtr]);
	}
}