'''
This is a currency exchanger between Japanese Yen and US dollars.
The exchanger works both ways.
Asks which way the user would like to exchange, then the amount of money they have, and finally the code prints out the value of that amount of money.
'''
usd = 1
yen = 111.44
numbers = ['1','2','3','4','5','6','7','8','9','0']
print("Welcome to the Japanese Yen to United States' Dollar Currency Exchanger.\n")
way = input("Would you like to change Japanese yen into US dollars, or the other way around? \nPlease type a 1, for Yen to US dollars, and a 2 for US dollars into Yen. ")
print("")
if way.lower() != "1" or "2":
    while way.lower() != "1" or way.lower() != "2":
        if way.lower() == "1" or way.lower() == "2":
            break
        way = input("Please type a 1, for Yen to US dollars, and a 2 for US dollars into Yen. ")

money = input("How much money do you have? ")
def checkMoney(money):
    '''
    (str) -> (str)

    Checks to make sure that there are no weird characters.
    '''
    for x in money:
        if x not in numbers:
            money = input("How much money do you have? ")
            checkMoney(money);

checkMoney(money);
print(money)
money = float(money)

def ytd(money):
    '''
    (float) -> (float)

    Turns Japanese Yen into United States' Dollars.
    '''
    amount = money / yen
    amount *= 100
    amount = int(amount)
    amount /= 100
    print(amount)

def dty(money):
    '''
    (float) -> (float)

    Turns United States' Dollars into Japanese Yen.
    '''
    amount = money * yen
    amount = int(amount)
    print(amount)

if way.lower() == "1":
    ytd(money);

elif way.lower() == "2":
    dty(money);

else:
    print("error")