memcmp

10,000+ views

GPL — licence
Edit / fork this page
Contents
  1. INTERFACE
  2. DESCRIPTION
  3. RETURN VALUES
  4. SEE ALSO

compare byte string

You're viewing an older version of this page (#4057). View the current version.

Computing C String.h

View versions (3)

INTERFACE

#include <string.h>
int memcmp ( const void *b1, const void *b2, size_t len )

DESCRIPTION

The memcmp function compares byte string b1 against byte string b2. Both strings are assumed to be len bytes long.

Example 1
Workings

\code #include <stdio.h> #include <string.h> int main() { // define two identical arrays char u[5] = {1, 2, 3, 4, 5}, v[5] = {1, 2, 3, 4, 5}; if (!memcmp(u, v, 5*sizeof(char))) printf("The two arrays store the same elements.
"); else printf("The two arrays store different elements.
"); return 0; } \endcode

Solution

Output:

The two arrays store the same elements.

RETURN VALUES

The memcmp function returns zero if the two strings are identical, otherwise returns the difference between the first two differing bytes (treated as unsigned char values, so that '\\200' is greater than '\\0,' for example). Zero-length strings are always identical.

SEE ALSO

strcmp, strcoll