“strlen(s1) - strlen(s2)” is never less than zero

Question

I am currently writing a C program that requires frequent comparisons of string lengths so I wrote the following helper function:

int strlonger(char *s1, cha         


        

Answer 1

strlen returns a size_t which is a typedef for an unsigned type.

So,

(unsigned) 4 - (unsigned) 7 == (unsigned) - 3

All unsigned values are greater than or equal to 0. Try converting the variables returned by strlen to long int.