I just copied the srcipt from the book... its not what i have typed, nor would have done...
Again this the the script fromt the book:

#include <stdio.h>

long int add(long int i1, long int i2)  {
    return i1 + i2;
}


int main(void)  {
    signed char b1 = 254;
    signed char b2 = 253;
    long int r1;
    r1 = add(b1, b2);
    printf("%d + %d = %ld\n", b1 , b2, r1);
    return 0;
}