#This is a text based calculator written for the Unit 5 programming assignment.

#Prompting the user for input. Their input will be assigned to the first operand.
#The users unput is cast to the float data type to allow for more presice evaluations.
#This is consistent throughout the entire program.
print("Please enter your first operand")
first_number = float(input())
while first_number == 0:
    print("Please enter a number greater than or less than zero")
    first_number = float(input())
    continue

#Prompting the user for input. Their input will be assigned and used
#as the operator.
print("Please enter your operator")
operator = raw_input()
while operator != "*" or "/" or "+" or "-":
    print("Please use /,*,+, or + for your operator")
    operator = raw_input()
    continue

#Prompting the user for input. Their input will be assigned to the second operand
print("Please enter your second operand")
second_number = float(input())
while second_number == 0:
    print("Please enter a number greater than or less than zero")
    second_number = float(input())
    continue

#This function utilizes the operand variable to elect which variant of
#expression will be evaluated.
def evaluation(a, b):
    if operator == "*":
        calculaton = a * b
    elif operator == "/":
        calculaton = a / b
    elif operator == "+":
        calculaton = a + b
    else:
        calculaton = a - b

    print("Your soluton is: " + str(calculaton))

#Calling the evaluation function on the users defined variables to print a solution.
evaluation(first_number, second_number)