# Three ways to exchange two numbers

Source: Internet
Author: User

Remember when I first started to learn C + +, also did two number of exchanges, then only used the following first and the third method, today in the Reading of Wisdom Podcast Java Video tutorial, learned another two ways

Suppose a=10,b=20, swap the value of a A, b

Method one, using third-party variables, is also the most common method

`int c=a;a=b;b=a;`

Method Two, bitwise XOR OR operation

`A=a^b;b=a^b;    A^b^b=aa=a^b;    A^b^a=b`

`A=a+b;b=a-b;a=a-b;`

Method Four, a sentence to be done

`b= (a+b)-(A=B);`

The first method that is commonly used in the actual work

Three ways to exchange two numbers

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