#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

#include<string.h>

int main()

{

int a = 10;

int b = 20;

int tmp = 0;

printf("a=%d  b=%d\n", a, b);

tmp = a;

a = b;

b = tmp;

printf("a=%d  b=%d\n", a, b);

return 0;

}