C语言使用函数使两个数互换

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int fun(int x, int y) {
	int tmp = 0;
	tmp = x;
	x = y;
	y = tmp;
	printf("%d,%d", x, y);
	printf("\n");

	return 0;
}
int main() {
	printf("请输入两个数字实现交换：\n");
	int a = 0; int b = 0;
	scanf("%d%d", &a, &b);
	fun(a,b);
	system("pause");
	return 0;
}