What is the difference between ++x and x++ in c language

The difference between x and x in C language lies in the execution order and return value. x first increments the x value and then assigns it, the value after increment is returned; When using x you need to increment the after value, when using x you need to increment the before value.

The difference between x and x in C language

In C language, x and x are two operations symbol, used to increment the variable x. However, they have key differences in the order of execution and the values ​​returned.

Execution order

• x (prefix increment): First increment the value of x, and then assign the result to x.
• x (suffix increment): First assign the value of x to a temporary variable, then increment the value of x, and then assign the incremented result to x.

Return value

• x: Returns the incremented value.
• x : Return the original value before incrementing.

Example

<code class="c">int x = 5;
int y = ++x; // x 变为 6，y 为 6
int z = x++; // x 变为 7，z 为 6</code>

When to use which one

• Use x When you need to use increment immediately later value, or when the increment operation itself is not important.
• Use x when you need to use the original value of a variable before incrementing it, or when you need to know the original value before incrementing it.

Note

When using x and x, be sure to pay attention to the type and scope of the variable. If the incremented value exceeds the allowed range of the variable type, it results in undefined behavior or an overflow error.

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