Csapp: Unsigned number of possible program bugs

From Csapp Exercise 2.26

size_t strlen (constChar *s); int strloner (char *s,char *t) {    return strlen (s)-strlen (t);}

At first glance there is no problem, but size_t is defined as unsigned int, then when the s string length is less than t string, the result is negative, for the unsigned number is both a large unsigned number, so that the result is 1, the result is wrong

Correction can be calculated by avoiding the unsigned number of the following code, suitable for the calculation of length difference

int strlonger (char *s,char *t) {    return (int) strlen (s)-( int) strlen (t) >0;}

Of course, this problem as long as the length, can be changed to the following code, do not introduce calculations on the line

int strlonger (char *s,char *t) {    return strlen (s) > strlen (t);}

Csapp: Unsigned number of possible program bugs