strlen - calculate the length of a string
strlen - calculate the length of a string
#include <cs50.h>
#include <string.h>
int strlen(string s);
#include <string.h>
size_t strlen(const char *s);
This function calculates the length of s
.
The strlen() function calculates the length of the string pointed to by s
, excluding the terminating null byte ('\0').
This function returns the number of characters in s
, excluding the terminating NUL byte (i.e., '\0'
).
The strlen() function returns the number of bytes in the string pointed to by s
.
#include <cs50.h>
#include <stdio.h>
#include <string.h>
int main(void)
{
string s = get_string("Input: ");
printf("Output: ");
for (int i = 0, n = strlen(s); i < n; i++)
{
printf("%c", s[i]);
}
printf("\n");
}
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
strlen() | Thread safety | MT-Safe |
POSIX.1-2001, POSIX.1-2008, C89, C99, C11, SVr4, 4.3BSD.
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