交换两个变量的内容

 1 #include<studio.h>
 2 int main()
 3 {
 4     int a=5;
 5     int b=6;
 6     printf("a=%d b=%d\n",a,b);
 7     int t;
 8     t=a;
 9     a=b;
10     b=t;
11     printf("a=%d b=%d\n",a,b);
12     return 0;
13 }