pseudocode

Displaymenu int& choice:
	const string menu = string that contains the menu
	output menu
	input >> choice

IsPosNeg int value:
	if value == 0:
		output neither
	else if value < 0:
		output negative
	else:
		output positive

FindNumDigits int value:
	int digits
	digits = log(value)
	output digits

DisplayAdditionTable:
	for i = 0; i <= 12; i++:
		for j = 0; j <= 12 j++:
			output i + j
		output \n