2024-08-02: 6. Calculator
My simple calculator.
# def calculator function
def add(n1, n2):
return n1 + n2
def subtract(n1, n2):
return n1 - n2
def multiply(n1, n2):
return n1 * n2
def divide(n1, n2):
return n1 / n2
# create a dictionary contains =-*/ operations
operations = {
'+': add,
'-': subtract,
'*': multiply,
'/': divide
}
# start build this calculator
def calculator():
# input 1st number
num1 = float(input("What's the 1st number: "))
yesno = True
# start while loop
while yesno:
# print operation symbols(+-*/) for choose
for key in operations:
print(key)
# choose operation
symbol = input("pick a operation from symbols list above: ")
# input 2nd number
num2 = float(input("What's the next number: "))
# calculation
answer = operations[symbol](num1, num2)
# print answer
print(f"{num1} {symbol} {num2} = {answer}")
# let user choose if continue with the answer
if input(f"Input 'y' if you want continue with {answer}; or 'n' if you want start freshly.\n") == "y":
# assign the answer value to num1
num1 = answer
else:
# jump out from while loop
yesno = False
# call calculator itself
calculator()
# start run this calculator
calculator()