Another frequently-used standard string function is strlen(), which returns the length of the string pointed to by its argument, not including the terminating null character.
The strcmp() function accepts two character pointers as its arguments and returns either 0 if the strings pointed to are equal, a positive integer if the first string is greater than the second, or a negative integer if the second string is greater than the first.
The strstr() function returns a pointer to the first occurrence of the string pointed to by its second argument within the string pointed to by its first argument (disregarding the null terminator of the second string) or the NULL pointer if no match is found.
There are several other standard string functions for concatenating strings, converting strings of digits to integer or double values, etc.
