Write an expression that returns a random number between -5 and 5 inclusive.

solution:

	rand() % 11 - 5

explanation:

	The expression (rand() % 11) returns a random number between and
	including 0 and 10. Subtract 5 from this range and you get a random 
	number from -5 to 5.

	The general formula for finding a random number between a range	of low 
	number to high number is:

		rand() % (high - low + 1) + low