Can please anybody show me the bug in the code

Question

I am trying to create a menu based calculator but the code keeps bring an error
This part of code it us not yet finished.
Here is the code.

result = 0
def main():
print("1. Basic Math")
print("2. Advanced Math")
choice = input("enter choice: ")
if choice == "1":
result = mat()
elif choice == "2":
result = advanced()

result = main()

def mat():
print("1. Addition")
print("2. Subtraction")
print("3. Multplication")
print("4. Remainder")
print("5. Division")
choice2= input("enter choice: ")
if choice2 == "1":
result = add()
elif choice2 ==" 2":
result = sub()
elif choice2 == "3":
result = mult()
elif choice2 == "4":
result = rem()
elif choice2 == "5":
result = div()

result = mat()

def add():
num1 = int(input("Enter no 1: "))
num2 = int(input("Enter no 2: "))
print(num1 + num2)
result = add()

Answer 1

add() is not a built-in function of Python. I think he is thinking of the magic method __add__() which belongs to an object.
Your issue is that you're calling function prior to them being defined. Python files are read by the interpreter from left to right top down. Your calling main() prior to the rest of the functions being defined, likewise with the add function. You can either rearrange your code so that the functions are above main() or you can move the function call below the point in which is subsequent function call is made so that they are all defined in the file first. You don't need to be setting any of the function calls to a variable, as none of your functions return any values. Keeping the call to main() as the last line will fix the issue.

Example code;

https://code.sololearn.com/csW9YLCYMcM9/?ref=app

Answer 2

U should define the function before calling or using it
And u should put else in your code and complete it

Answer 3

Muhammad
Thanks for your help.
Let me try and see.

Answer 4

You're welcome

Answer 5

ChaoticDawg
Thanks for your help
The code now works properly.

Answer 6

It looks like you are calling matovu before you have defined it. If you move the def matovu () block above the def main () block, you should be fine.

Answer 7

Muhammad
I have changed the code but now it brings an error that matovu is not defined

result = 0
def main():
print("1. Basic Math")
print("2. Advanced Math")
choice =int( input("enter choice: "))
if choice == 1:
matovu()
elif choice == 2:
result = advanced()

result = main()

def matovu():
print("1. Addition")
print("2. Subtraction")
print("3. Multplication")
print("4. Remainder")
print("5. Division")
choice2= int(input("enter choice: "))
if choice2 == 1:
result = new()
elif choice2 == 2 :
result = sub()
elif choice2 == 3:
result = mult()
elif choice2 == 4:
result = rem()
elif choice2 == 5:
result = div()

result = matovu()

def new():
num1 = int(input("Enter no 1: "))
num2 = int(input("Enter no 2: "))
print(num1 + num2)
result = new()

Answer 8

Luke Morrison
Thanks for notifying it