What does !x mean in C language?

In C language, !x represents the logical NOT operation, which converts a Boolean value into its opposite value: if x is true, then !x is false; if x is false, then !x is true.

The meaning of !x in C language

In C language, ! operation symbol represents the logical NOT operation, which converts a Boolean value to its opposite value. Therefore, !x means:

If x is true, then !x is false; if x is false, then !x is true.

Operation rules:

• If x is 0 (logical false), then !x is 1 (logical true).
• If x is non-zero (logically true), then !x is 0 (logically false).

Example:

<code class="c">int x = 10;
if (!x) {
  // 这个分支永远不会执行，因为 x 不为 0
}</code>

<code class="c">int x = 0;
if (!x) {
  // 这个分支会执行，因为 x 为 0
}</code>

Usage:

Logical NOT operator! Often Used for:

• Convert true values ​​to false values ​​and vice versa.
• Check if the condition is false.
• Realize logic gate circuits, such as NOT gates.
• Invert a bit field or bit mask.

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