C语言实现两数交换

 1 #include <stdio.h>
 2 int main()
 3 {
 4     int a ,b,c;
 5     printf("请输入第一个数字");
 6     scanf("%d",&a);
 7     printf("请输入第二个数字");
 8     scanf("%d",&b);
 9     printf("交换之前a=%d\tb=%d",a,b);
10     printf("\n");
11     a = a + b;
12     b = a - b;
13     a = a - b;
14     printf("交换之后a=%d\tb=%d",a,b);
15     printf("\n");
16     printf("---------------------------------");
17     printf("\n");
18     printf("交换之前a=%d\tb=%d",a,b);
19     printf("\n");
20     a = a - b;
21     b = a + b;
22     a = b - a;
23     printf("交换之后a=%d\tb=%d",a,b);
24     printf("\n");
25     printf("---------------------------------");
26     printf("\n");
27     printf("交换之前a=%d\tb=%d",a,b);
28     printf("\n");
29     c = a;
30     a = b;
31     b = c;
32     printf("交换之后a=%d\tb=%d",a,b);
33     printf("\n");
34 }