How to use strlen() function in c language

The usage of strlen() function in C language is: [strlen(const char *str)]. This function is used to calculate the length of a string up to, but not including, the null terminating character and returns the length of the string.

Function introduction:

(Recommended tutorial: c language tutorial)

strlen() Function is used to calculate the length of a string up to, but not including, the null terminating character.

Syntax structure:

size_t strlen(const char *str)

Parameter description:

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

Return value:

This function returns the length of the string.

Code implementation:

#include <stdio.h>
#include <string.h>
int main (){
   char str[50];
   int len;

   strcpy(str, "This is phpphp.com");

   len = strlen(str);
   printf("|%s| 的长度是 |%d|\n", str, len);
   return(0);}

Output result:

|This is phpphp.com| 的长度是 |18|

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