I'm having some code reading issues

Question

I'm studying for C test soon, and I will appreciate your help with a few code reading I can't figure out myself, the first one is:

main()
{
    char *p = "Hello", *q = "world!";
    while (*p * *q)
        p++, ++q;
    printf("%c", *q - *p);
}

If you guys can help me understand the output and what is going on there that will help me a lot.

`while(*p * *q)` should probably be changed to `while(*p && *q)`. — Micha Wiedenmann, Feb 10 '16 at 10:35
Another question please, if there is a statement : if(a & 0x8) and a is 15. how do I know if the "If" is true or false ? — Natezone, Feb 10 '16 at 16:55

score 0 · Answer 1 · edited May 23 '17 at 12:23

The code you posted seems wrong to me.

main()

should probably be int main() (Declare main prototype).

{
    char *p = "Hello", *q = "world!";

    while (*p * *q)

while the value pointed to by p multiplied with the value pointed to by q is different from zero

        p++, ++q;

increment both p and q.

    printf("%c", *q - *p);

It is that the printf is not part of the while loop. In any case it prints the arithmetic difference of the values pointed to.

1 Answers1