Thread: Random number generation problem to generate co-ordinates in a range

Hello,

I am woking on a program which requires the generation of two random numbers to be used as X and Y co-ordinates within a certain range. I have found a random number generator for this:

Code:

int randLim (int min, int max){
    
    int randNo;
    srand(time(NULL));

    randNo = (rand() % (max - min + 1) + min);
    
    return randNo;
}

And I use it here:

Code:

        int randomX = randLim(1,mapX);
        //Sometimes put a Sleep(); command in here
        int randomY = randLim(1,mapY);

The problem I am having is that most of the time the two numbers are the same, and even if I put in a slight delay to make them different they end up looping through the same numbers over and over (usually going up in 3's or 4's)

I was wondering if anyone had any better ideas to use for a random number generator or if I am going about this wrong.

Many thanks in advance.

Wow, not only does it work it is also a lot faster!

How exactly does it work better this way?

Although this is working better, I'm not sure it has fixed the skipping numbers problem.

I.e certain co-ordinate combinations may never be generated

I'm running it at the moment and its 20x20 and sometimes it does not complete, however this may be an error in other parts of the code. I am looking through as I type this and shall update this thread after I have had a good scour.

Thanks for all your help so far though =)

In which purpose u r making this bro!.. Is this a graphic based programme!