The meaning of ~ in c language

~ is a logical NOT operator in C language, which performs a bit flip operation: if the expression is 0, it returns 1; if it is 1, it returns 0. Uses include: bit masking, bitwise negation, and logical negation.

The meaning of ~ in C language

In C language, the ～ symbol is A logical NOT operator. It performs a bit flip operation on a given expression, changing all bits in the expression from 0 to 1, or from 1 to 0.

Specifically, it does the following:

• If the expression is 0, it returns 1.
• If the expression is 1, return 0.

For example:

<code class="c">int x = 5;
int y = ~x;
printf("%d\n", y); // 输出：-6

int a = 0;
int b = ~a;
printf("%d\n", b); // 输出：1</code>

Usage:

～ operator is usually used The following scenarios:

• Bit Masking: It can be used to mask certain bits in an expression, thereby clearing or retaining these bits.
• Bitwise negation: It can be used to perform bitwise negation of an integer, which is useful in certain binary operations.
• Logical NOT: It can be used to check whether an expression is false (0) and thus used in conditional statements.

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