Why does my calculator not work?

Question

can someone tell me whats wrong?

while true:
user_input=input()
if user_input=="quit"
break
elif user_input=="add"
num1=float(input("Enter a number:"))
num2=float(input("Enter another number:"))
result=str(num1+num2)
print("The answer is"+result)
elif user_input=='substract'
num1=float(input("Enter a number:"))
num2=float(input("Enter another number:"))
result=str(num1-num2)
print("The answer is"+result)

(also wrote the codes for division and multiple,too much to type though)

else:
print("Unknown input")

Answer 1

Incorrect Code:
while true: #true is a variable, use True (bool)
user_input=input()
if user_input=="quit" #colon missing.
break
elif user_input=="add"
num1=float(input("Enter a number:"))
num2=float(input("Enter another number:"))
result=str(num1+num2)
print("The answer is"+result)
elif user_input=='substract'
num1=float(input("Enter a number:"))
num2=float(input("Enter another number:"))
result=str(num1-num2)
print("The answer is"+result)
Corrected Code:

while True:
user_input=input("Input")
if user_input=="quit":
break
elif user_input=="add":
num1=float(input("Enter a number:"))
num2=float(input("Enter another number:"))
result=str(num1+num2)
print("The answer is"+result)
elif user_input=='substract':
num1=float(input("Enter a number:"))
num2=float(input("Enter another number:"))
result=str(num1-num2)
print("The answer is"+result)

So in-short:
Remember:
a) Indentation is NOT for beauty, it just has to be done in order for python to be able to interpret it
b)colon after a statement is important
c)don't get confused between a Boolean Literal and a variable.

And please let me know if you have any querries. and never lose faith in the power of python.

Regards
Aditya Shukla

Answer 2

you are making too much mess . python is for simplicity . true is invalided . use True

Answer 3

That's literally the first I tried with python, could you explain with more detail please?

Answer 4

Not to be Offensive, but this Python Code is Messy.
Use indents by TAB'ing in appropiate places, to make easy readability.

Also, consider the appropiate spelling of Python Functions.
Remember: Python is a CaSe SeNsItIvE Language!

Good Luck.

Answer 5

see my latest Basic Calculator code its the easiest for a calculator and least messy
and the function which I used is really known to a very little people