cppreference.com > Standard C String and Character > strcmp strcmp Syntax:
      #include <string.h>
      int strcmp( const char *str1, const char *str2 );
The function strcmp() compares str1 and str2, then returns:
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''
For example:
       printf( "Enter your name: " );
       scanf( "%s", name );
       if( strcmp( name, "Mary" ) == 0 )
         printf( "Hello, Dr. Mary!\n" );
Related topics: memcmp strcat strchr strcoll strcpy strlen strncmp strxfrm