cs24-20fa strlen

Introduction to Computing Systems (Fall 2020)

Name

strlen - calculate the length of a string

Synopsis

#include <string.h>

size_t strlen(const char *s);

Description

The strlen() function calculates the length of the string pointed to by s, excluding the terminating null byte (‘\0’). Note that strlen() stops counting characters as soon as it encounters a null byte.

Example

#include <assert.h>
#include <string.h>

int main() {
    char s[7] = "hello!";
    assert(strlen(s) == 6);
}

Return Value

Upon completion, the strlen() function returns the number of characters in the string pointed to by s.

See Also

strcpy(), strncpy(), strcmp()