编写程序交换两个数字而不使用第三个变量？

方法1（（使用算术运算符）：

 

 

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#include <stdio.h>   int main() {   int a = 10, b = 5;   // algo to swap 'a' and 'b'   a = a + b;  // a becomes 15   b = a - b;  // b becomes 10   a = a - b;  // fonally a becomes 5   printf("After Swapping the value of: a = %d, b = %d\n\n", a, b);   return 0; }

 

方法2（使用按位异或运算符）：

 

 

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#include <stdio.h>   int main() {   int a = 10, b = 5;   // algo to swap 'a' and 'b'   a = a ^ b;  // a becomes (a ^ b)   b = a ^ b;  // b = (a ^ b ^ b), b becomes a   a = a ^ b;  // a = (a ^ b ^ a), a becomes b   printf("After Swapping the value of: a = %d, b = %d\n\n", a, b);   return 0; }