gistfile1.cpp

const unsigned gWidth = 3;
const unsigned gHeight = 3;

for(unsigned y = 0; y<gHeight; y++){
	for(unsigned x = 0; x<gWidth; x++){
		// Stuff in here is done once for each x. 
		// But, it's done gHeight number of times, since this loop is performed inside
		// the outer loop!
		
		// So, stuff in here is done gHeight*gWidth times. x and y look like this:
		
		// y,  x
		// 0   0
		// 0   1
		// 0   2
		// 1   0
		// 1   1
		// 1   2
		// 2   0
		//...
	}
	
	// Stuff here is done during each of the outer loop's
	// iterations, after all the stuff in the inner loop is done.

}