Question

here is code.

   int main(int argc, const char * argv[])
    {

        @autoreleasepool {

            int x,y;
            //BOOL divsibleYESOrNo;

            NSLog(@"enter two number for test it\n");
            scanf("%i %i",&x,&y);

            if ( x%y ==0 ) {

                NSLog(@"YES,it can be");
            }

            else if (x%y !=0) {
                NSLog(@"no there cant.");
            }
            else 
                NSLog(@"zero is not allow");
        }
        return 0;
    }

this code can not detect if the user input two zero.
how can I modify this code that can detect the input values are zero?

Thanks

Answer 1

Anything % 0 is undefined, so you’ll need to add a check for y == 0 before your other if statements. It has to be the first if statement in order to make sure it gets evaluated; otherwise one of your other statements will catch it erroneously first.

if ( y == 0 ) {
    NSLog(@"zero is not allowed.");
}
else if ( x%y == 0 ) {
    NSLog(@"YES,it can be");
}
else {
    NSLog(@"no there cant.");
}