Detailed explanation of strlen usage in C language

Detailed explanation of strlen usage in c language:

The function of strlen() function is to count the length of a given string.

Function prototype: unsigned int strlen(char *str);

Function: Count the number of characters in the string str, excluding '\0'

Return value: Return the number of characters

Example:

char *str1 = "abcdef";   // 定义一个字符指针
char str2[] = "abcdef";  // 定义一个字符数组
int len = strlen(str1);  // 统计str1字符的个数，结果为6
int len = strlen(str2);  // 统计str2字符的个数，结果为6

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