import token

def calculate_results(tokens):
	
	return 0

def peek_list(tokens):
    if tokens:
        return tokens[-1]
    else:
        raise IndexError("The token list is empty.", tokens)

def operate(n1, n2, tokenType):
	if tokenType == token.TokenType.add:
		print("Adding %d and %d to get %d." %(n1, n2, n1 + n2))
	elif tokenType == token.TokenType.subtract:
		print("Subtracting %d and %d to get %d." %(n1, n2, n1 - n2))
	elif tokenType == token.TokenType.multiply:
		print("Multiplying %d and %d to get %d" %(n1, n2, n1 * n2))
	elif tokenType == token.TokenType.divide:
		print("Dividing %d and %d to get %d" %(n1, n2, n1 / n2))
	elif tokenType == token.TokenType.power:
		print("Raising %d to the power of %d to get %d" %(n1, n2, n1**n2))
	else:
		raise TypeError("Invalid operator value " + str(tokenType) + ".", tokenType)