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;
}
