What does strlen mean in C language?

#What does strlen mean in C language?

The strlen function is a standard library function in C language. Its function is to calculate the length of a string, but does not include "\0".

Syntax and description

C library function size_t strlen(const char *str) calculates the length of the string str until the null terminating character, but does not include the null terminating character .

size_t strlen(const char *str)

Parameters

str -- The string whose length is to be calculated.

Return value

This function returns the length of the string.

Example

The following example demonstrates the usage of strlen() function.

#include <stdio.h>
#include <string.h>
int main ()
{
   char str[50];
   int len;
   strcpy(str, "This is php.cn");
   len = strlen(str);
   printf("|%s| 的长度是 |%d|\n", str, len);
   
   return(0);
}

Let us compile and run the above program, which will produce the following results:

|This is php.cn| 的长度是 |14|

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