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Compute the length of a string
#include <string.h>
size_t strlen( const char * s );
- s
- The string whose length you want to calculate.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The strlen() function computes
the length of the string pointed to by s.
The number of characters that precede the terminating null character.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main( void )
{
printf( "%d\n", strlen( "Howdy" ) );
printf( "%d\n", strlen( "Hello world\n" ) );
printf( "%d\n", strlen( "" ) );
return EXIT_SUCCESS;
}
produces the output:
5
12
0
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
wcslen()
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