I have defined the color black like this: class Color { public: float r,g,b; Color (float argr, float argg, float argb) { r = argr; b = argb; g = argg; } }; Color black = Color(0.0,0.0,0.0); and somewhere else in my code I have this: "printf("black = %f %f %f\n",black.r,black.g,black.b);" but printf does not display the color black. It displays (0.0,0.17,0.0); which is some ugly green. No where in my code do I have something like "black = ". I'm pretty sure there is some collision of memory. Like 2 variables that use the same memory space. I also think that a 2dimensional array is involved. The array is = "galaxygridtile galaxygrid[10][10];" where: " class galaxygridtile { public: int race; double chance; };" Once I fill up the galaxygrid with values, the color black changes from black to ugly green. How can such collisions occur? And how can I remove them?

Okay more code =)

This is the line causing the bug. If I disable it then no bug occurs:
fillgalaxygridforrace(1,20);
After this line is run the color black changes from real black to ugly green.

The only thing fillgalaxygridforrace really does it loop a lot of times; create a lot of local variables; and set the values of galaxygrid.
This is the function:
void fillgalaxygridforrace(int race,int maxcount) {
int count = 0;
int xcor;
int ycor;

while (count < maxcount) {
//printf("loopingwhile\n");
//xcor = getRandomCor();
//ycor = getRandomCor();
xcor = 0;
ycor = 0;
if (race==2){
xcor = 10-xcor;
}
else if (race==3){
ycor = 10-ycor;
}

///*
if (galaxygrid[xcor][ycor].race != 0){
int side = 0, id = 0, rad = 1;
int xbase = xcor, ybase = ycor;
while (((xcor<10) && (ycor<10))&&(galaxygrid[xcor][ycor].race != 0)){
totalshit+=1;
printf("totalshit = %d\n",totalshit);
int length = rad*2;
switch (side){
case 0: xcor = xbase-rad;
ycor = ybase-rad+id;
break;
case 1: xcor = xbase-rad+id;
ycor = ybase+rad;
break;
case 2: xcor = xbase+rad;
ycor = ybase+rad-id;
break;
case 3: xcor = xbase+rad-id;
ycor = ybase-rad;
break;
}
id += 1;
if (id>length){
id = 0;
side+=1;
if (side>3){
side=0;
rad+=1;
}
}
}
}
//*/
galaxygrid[xcor][ycor].race = race;
//double chance = max(0.0,1.0-sqrt((sqr(xcor/4.5-1.0) + sqr(ycor/4.5-1.0))/2.0));
//galaxygrid[xcor][ycor].chance = chance;
galaxygrid[xcor][ycor].chance = 0.5;
count = count+1;
}
}

Another note: the program also has crashes when running fillgalaxygrid.
I get "Process terminated with status -1073741819 (0 minutes, 22 seconds)"

When 2 or 3 is passed in race, xcor or ycor will be 10, causing an out of bounds write to the array.

egh you're right.
I'm such an idiot =D

Couple of other things:

In your while loop you check for validity of xcor and ycor, so there's a good change, xcor and ycor are out of bounds after the loop. But yet, you use those values again, without checking.

I would also recommend to define a constant for the size of the grid (10 at the moment). Otherwise it'll be a pain to change the size of the grid later.