#include <stdio.h>
 
int sum(int a, int b); //함수원형
void swap(int *p, int *q);
 
int main(void)
{
	int a, b, total;
	printf("input two integers: ");
	scanf("%d%d", &a, &b);
	printf("a:%d, b:%d \n", a, b);
	total = sum(a, b);
	printf("**sum function call**\n");
	printf("%d+%d=%d\n", a, b, total);
	swap(&a,&b);
	printf("**swap function call**\n");
	printf("a:%d, b:%d \n", a, b);
	return 0;
}
 
int sum(int a, int b)
{
	int total;
	total = a + b;
	return total;
}
 
void swap(int *p, int *q)
{
	int temp;
	temp = *p;
	*p = *q;
	*q = temp;
}

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