What does the wavy line mean in C language?

The purpose of the tilde (~) in C language: to negate the operand bitwise, changing 0 to 1 and 1 to 0. Commonly used to negate a binary number or create a two's complement representation.

The tilde (~) in C language

In C language, the tilde (~) operation symbol means bitwise negation. It inverts each binary bit in the operand from 0 to 1 and from 1 to 0.

Usage

The tilde operator is mainly used for:

• Invert a binary number
• Create a complement representation

Syntax

The syntax of the tilde operator is as follows:

<code class="c">~表达式</code>

Example

The following example demonstrates how the tilde operator works:

<code class="c">int a = 5; // 二进制表示：0101
int b = ~a; // 二进制表示：1010

printf("a = %d\n", a); // 输出：5
printf("b = %d\n", b); // 输出：-6</code>

In this example, the binary representation of a is 0101. After applying the tilde operator (~a), each binary bit is inverted, resulting in 1010, which is the complement representation of -6.

Note

The tilde operator is a bitwise operator, which operates on the binary bits in the operand one by one. Therefore, it can only be used with integer types (char, int, long, etc.).

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