经典数值交换算法

1.借助中间量交换
 
int x = 10;
int y = 20;
int temp = x;
x = y;

y = temp;

2.数值相加减交换
 
int x = 10;
int y = 20;
x = x + y;
y = x - y;
x = x - y;

3.异或运算交换
 
int x = 10;
int y = 20;
x = x ^ y;
y = x ^ y;
x = x ^ y;