利用指针交换两数

#define _CRT_SECURE_NO_WARNINGS 1 
#include <stdio.h>
#include<string.h>

void swap(int*pa, int*pb)
{
	int z = 0;
	z = *pa;
	*pa = *pb;
	*pb = z;
}

int main()
{
	int a = 10;
	int b = 20;
	printf("交换前：a=%d b=%d\n", a, b);
	swap(&a,&b);
	printf("交换后：a=%d b=%d\n", a, b);
	return 0;
}