第一种：使用中间变量
int a = 1, b = 2, c;
c = a;
a = b;
b = c;
printf(“%d,%d”, a, b);
第二种：
int a = 1, b = 2;
a = a + b;
b = a - b;
a = a - b;
printf(“%d%d”, a, b);
或者:
a = a ＊ b;
b = a / b;
a = a / b;
第三种：
int a = 1, b = 2;
a ^= b;
b ^= a;
a ^= b;
printf(“%d,%d”, a, b);
int a = 1, b = 2;
b = (_int64)((_int64) a << 32 | (a = b)) >> 32;
printf(“%d,%d”, a, b);
C语言交换变量值的几种方法
原文：http://www.cnblogs.com/songyan-Z221/p/5820077.html
