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 strncmp()               Compare n Characters of Two Strings, Case Sensitive

 #include   <string.h>                   Required for declarations only

 int           strncmp(string1,string2,n);
 const char *string1;
 const char *string2;
 size_t  n; Number of characters to compare

    strncmp() performs a lexicographic comparison of up to the first 'n'
    characters of 'string1' and 'string2'.  Case is significant (i.e.,
    'A' != 'a').

    Returns:    A value indicating the relationship between the two
                strings:

                      Comparison          Returned

                'string1' <  'string2'      < 0
                'string1' == 'string2'        0
                'string1' >  'string2'      > 0

      Notes:    strncmp() expects to operate on null-terminated strings.
   -------------------------------- Example ---------------------------------
 The following statements compare two strings up to the length of the first
 string.
           #include <string.h>
           #include <stdio.h>

           char str1[20] = "eucalyptus trees";
           char str2[20] = "Eucalyptus trees";
           int rslt;

           main()
           {
               if((rslt = strncmp(str1,str2,strlen(str1))) == 0)
                     printf("strings are equivalent");

               else
                    printf("strings are not equivalent");
           }