Does the string length include \0?

The length of the string includes the \0 character. In C language, the string is composed of a character array and ends with \0. This \0 character is used to indicate the end of the string. Therefore, the string The length of is the number of characters in the character array, including the last \0 character.

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#The operating environment of this article: Windows 10 system, C 20 version, dell g3 computer.

In C language, a string is composed of a character array and ends with \0 (null character). The \0 character is used to indicate the end of the string. Therefore, the length of the string is the number of characters in the character array, including the last \0 character.

For example, if there is a string "Hello", it actually consists of 5 characters ('H', 'e', ​​'l', 'l', 'o') and ends with \ Ending with 0 characters. Therefore, the length of this string is 5.

In C language, you can use the built-in strlen() function to get the length of a string. This function will start from the given character pointer and count the number of characters until it encounters the \0 character.

The following is a sample program that demonstrates how to calculate the length of a string:

#include <stdio.h>
#include <string.h>
int main() {
    char str[] = "Hello";
    int length = strlen(str);
    printf("字符串的长度为：%d\n", length);
    
    return 0;
}

This program will output:

The length of the string is: 5

So, the length of the string includes the \0 character.

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