I have never seen this error before

[fire child]

The error is
"Unhandled exception at 0x00415360 in grid.exe: 0xC0000094: Integer division by zero."

what I'm trying to do is find a random number on a grid.
the grid has already been assigned with numbers

int number; // just any number
int randnum; // number assigned to the grid
int randlong; // random point along x axis
int randhigh; // random point along y axis
int height; // height of the grid
int length; // length of the grid

randhigh = rand() % height;
randlong = rand() % length;

randnum = countgrid[randhigh][randlong];
// randnum > 0

// here is the error
number = rand() % randnum;

[Duthomhas]

It means exactly what it says: you cannot divide by zero. (Mathematically, such a thing is undefined -- so it makes no sense to try it.) Hence:

int a = 7;
int b = 0;
int c = a % b;

Produces a hardware interrupt which you get as "Good grief you tried to divide by zero."

Hope this helps.

[vince510]

I dont know how you grab random numbers because i'm a beginner, but maybe it is grabbing a 0. so just check to make sure it doesnt grab a 0 before performing the operation. And int the rand() % something; part of your code it looks like ur using modulus operator and maybe returning 0?

[fire child]

Ok I've found where my problem is
How do I set randnum to the number in countgrid at point randhigh, randlong?

randnum = countgrid[randhigh][randlong];

randnum = 0 even though countgrid[randhigh][randlong] = 3