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strlen

From cppreference.com
< c‎ | string‎ | byte
Defined in header <string.h>
size_t strlen( const char *str );

Returns the length of the given byte string.


The null character is excluded from the length.

Contents

[edit] Parameters

str - pointer to the null-terminated byte string to be examined

[edit] Return value

The length of the null-terminated string str.

[edit] Example

#include <string.h>
#include <stdio.h>
 
int main(void)
{
    const char str[] = "How many characters does this string contain?";
 
    printf("without null character: %zu\n", strlen(str));
    printf("with null character: %zu\n", sizeof(str));
 
    return 0;
}

Output:

without null character: 45
with null character: 46

[edit] See also