int strcmp(string string1, string string2)

int stricmp(string string1, string string2)

int strncmp(string string1, string string2, int length)

int strnicmp(string string1, string string2, int length)

•These functions compare two strings and return a comparison value. The function returns a value of zero, less than zero, or greater than zero if string1 is equal to, less than, or greater than string2, respectively.

•strcmp() and strncmp() perform a case-sensitive compare

•stricmp() and strnicmp() perform a case-insensitive compare

•Functions with a length parameter only compare up to the first length characters.