strncmp will test at most 'n' characters in s1 to s2 for equallity.
Library:   string.h
Prototype: int strncmp(const char *s1, const char *s2, int n);
Syntax:	   char string1[]="red dwarf";
	   char string2[]="red";
           strncmp(string1, string2, 3);
Returns :
           < 0 if s1 is less than s2
	     0 if s1 == s2
	   > 0 id s1 > s2
Could do with more explanation....
 strcmp
strcmp
 strcasecmp  Compare strings, ignoring case.
strcasecmp  Compare strings, ignoring case.
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