strlen() — Determine String Length
Format
#include <string.h>
size_t strlen(const char *string);Language Level
ANSI
Threadsafe
Yes
Description
The strlen() function
determines the length of string excluding
the ending null character.
Return Value
The strlen() function
returns the length of string.
Example
This example determines the length
of the string that is passed to
main(). #include <stdio.h>
#include <string.h>
int main(int argc, char ** argv)
{
if ( argc != 2 )
printf( "Usage: %s string\n", argv[0] );
else
printf( "Input string has a length of %i\n", strlen( argv[1] ));
}
/****************** If the input is the string ***********************
*****************"How long is this string?", ******************
****************** then the expected output is: *****************
Input string has a length of 24
*/