How to use swap in c++

Usage of swap function in C

The swap function is a standard function in C, used to exchange the values ​​of two variables or expressions. The syntax is as follows:

<code class="cpp">void swap(T& x, T& y);</code>

Where:

• T is the data type participating in the exchange
• x and y is the variable or expression to be exchanged

Usage:

To use the swap function, simply pass it the two variables or expressions whose values ​​you want to swap as arguments:

<code class="cpp">int a = 5, b = 10;

// 交换 a 和 b 的值
swap(a, b);

// 现在，a 的值为 10，b 的值为 5</code>

Benefits:

Using the swap function is more concise and efficient than manually exchanging the values ​​of variables. It avoids the use of temporary variables or complex assignment operations, thus simplifying the code and improving readability.

Note:

• The swap function can only exchange variables or expressions of the same data type.
• swap function does not change the memory address of the variables or expressions involved in the exchange, only changes their values.
• For basic data types, the swap function is an inline function, which means that it is expanded at compile time rather than called at runtime.
• For class types, the swap function is usually declared as a member function and provides user-defined exchange logic.

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