Question

print("enter start() to start the program")

def start():
    print("This script converts GBP into any currency based on the exchange rate...")
    print(" ") #enters a line
    exchangeRate = int(input("Enter the exchange rate (Eg: 0.80)"))
    print("how much would you like to convert???")                       
    gpb = int(input())
    print(gpb*exchangeRate)

If I put the exchange-rate at 0.81 and I enter £1 it always returns 0.

Answer 1

Use float() instead of int() with your input() call. I.e.,

    gpb = float(input())

otherwise if the user enters 0.81, int() will truncate this to 0 during the conversion.

By using float() you’ll keep the decimal value supplied as input and your computation should yield the result you expect.