C語言實現兩數交換

 1 #include <stdio.h> 2 int main() 3 { 4     int a ,b,c; 5     printf("請輸入第一個數字"); 6     scanf("%d",&a); 7     printf("請輸入第二個數字"); 8     scanf("%d",&b); 9     printf("交換之前a=%d\tb=%d",a,b);10     printf("\n");11     a = a + b;12     b = a - b;13     a = a - b;14     printf("交換之後a=%d\tb=%d",a,b);15     printf("\n");16     printf("---------------------------------");17     printf("\n");18     printf("交換之前a=%d\tb=%d",a,b);19     printf("\n");20     a = a - b;21     b = a + b;22     a = b - a;23     printf("交換之後a=%d\tb=%d",a,b);24     printf("\n");25     printf("---------------------------------");26     printf("\n");27     printf("交換之前a=%d\tb=%d",a,b);28     printf("\n");29     c = a;30     a = b;31     b = c;32     printf("交換之後a=%d\tb=%d",a,b);33     printf("\n");34 }