#include <string.h> int strncmp( const char *str1, const char *str2, size_t count );
The strncmp() function compares at most count characters of str1 and str2. The return value is as follows:
Return value Explanation
less than 0 str1 is less than str2
equal to 0 str1 is equal to str2
greater than 0 str1 is greater than str2
If there are less than count characters in either string, then the comparison will stop after the first null termination is encountered.
strcmp(), strnchr(), strncpy()