The difference between !x and x! in c language

In C language, !x represents logical NOT operation, converting true value to false value, and false value to true value; Processor macro implementation, only works with non-negative integers.

##!The difference between x and x! in C language

Direct answer:

Detailed explanation:

• Logical NOT operation (!x): It converts true values ​​into false values ​​and false values Convert to true value. For example:

<code class="c">int x = 0;
printf("%d\n", !x); // 输出 1 (真)</code>

• Factorial operation (x!): It calculates the factorial (repeated multiplication of natural numbers) of a specified number. For example:

<code class="c">int x = 5;
printf("%d\n", x!); // 输出 120 (5 x 4 x 3 x 2 x 1)</code>

Difference summary:

There is no built-in factorial operator in C language. The

syntax is implemented through preprocessor macros.
• The factorial operation only works on non-negative integers.

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