Question

I have a problem with my iPhone application, i am trying to connect to my PHP script to get information about something.

I have this code that takes the respone from PHP Link(total tables) and puts it into responseRandomID.

But when i try and use it in a Random function, it comes up with an error when i try and run it?

connectionDidReciveData:

if(connection == connectionRandomID) {
        NSString *temp = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        responseRandomID = [temp intValue];
    }

connectionDidFinishLoading:

if(connection == connectionRandomID) {
        randomid = (int)1 + arc4random() % (1-responseRandomID+1);
    }

EDIT: This only happends when i have only 1 row in my database? But when i have 2 it crashes?

Answer 1

randomid = (int)1 + arc4random() % (1-responseRandomID+1);

can lead to / by 0 if responseRandomId == 2

if hardcoded e.g. 2 % 0 – the compiler catches it

if given via variable (as in your case) :

Exception Type:  EXC_ARITHMETIC (SIGFPE)
Exception Codes: EXC_I386_DIV (divide by zero)