允许创建临时变量
#include<stdio.h>

int main()
{
int a = 2,b = 5;
int temp = 0;
temp = a;
a = b;
b = temp;
printf("%d,%d\n",a,b);
return 0;
}

 

2.不允许创建临时变量
①.加法实现
#include<stdio.h>

int main()
{

int a,b;
printf("请输入两个数:");
scanf("%d,%d",&a,&b);
a = a + b;
b = a - b;
a = a - b;
printf("%d,%d\n",a,b);

return 0;
}

 

②.乘法实现
#include<stdio.h>

int main()
{

int a,b;
printf("请输入两个数:");
scanf("%d,%d",&a,&b);
a = a * b;
b = a / b;
a = a / b;
printf("%d,%d\n",a,b);

return 0;
}

 

③.逻辑“^”即“异或”(转化为二进制)
#include<stdio.h>

int main()
{

int a,b;
printf("请输入两个数:");
scanf("%d,%d",&a,&b);
a = a ^ b;
b = a ^ b;
a = a ^ b;
printf("%d,%d\n",a,b);

return 0;
}