# Several ways to swap the values in two variables

Source: Internet
Author: User

In the process of software development, it is often necessary to exchange the values of the two variables. There are three ways we can use the interchange method.

The first method:

`int a = 3, b = 4;int tmp;TMP = A;A = b;b = tmp;`

This approach is often used by the use of third variables.

The disadvantage is that the introduction of third-party variables, high memory consumption.

The second method:

`int a = 3, b = 4;A = a + B;   A = 7; The principle is to use two numbers and a + b = Sumb = a A; b = 7-4 = 3 B = sum-bA = a-B;  A = 7-3 = 4; A = Sum-b`

The drawback of this approach is that if the values of the two variables are very large, it will cause two variables and overflow.

The advantage is that no third-party variables are introduced to save memory.

The disadvantage is that there is a risk of data overflow, and the readability is not strong.

The third method:

int a = 3, b = 4;

A = a ^ b; The principle is to use the XOR operator

b = a ^ b; b = a ^ b ^ b = A A ^ a = 0, b ^ 0 = b

A = a ^ b; A = a ^ b ^ a = a ^ a ^ b

The advantages of this method are: No third-party variables are introduced, and memory space is saved;

There is no problem of data overflow;

Several ways to swap the values in two variables

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