What does \0 mean in c language

In C language, '\0' represents an empty character, and its uses mainly include: 1. End string as the end flag of the string; 2. Terminate the character array and determine the length by '\0'; 3. Fill in unused memory; 4. In earlier versions, boolean values ​​should be represented, but the bool type should now be used.

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\0 Meaning in C

In C language, '\0' (ASCII value is 0) represents a null character. Its main uses are as follows:

End string

In C, a string is a character array with '\0' as the end flag. For example: "Hello" string is stored as:

 <code class="c">char str[] = "Hello\0";</code>

Each character in the string occupies an array element, and the last character is '\0'.

Terminate character array

The character array can be lengthed by '\0'. For example, the following code uses '\0' to determine the length of the array str:

 <code class="c">int len = 0; while (str[len] != '\0') { len ; }</code>

Other uses

'\0' can also be used for the following purposes:

• Fill unused memory : '\0' can be used to fill unused memory to prevent junk data from appearing.
• Represents Boolean : In earlier versions of C, '\0' was sometimes used to represent false, rather than 0 for true. However, the standard boolean type bool should be used now.

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