Please when I input a number in this code it stil tells me "That is not a valid number". What could be wrong? I am a beginner.

Question

https://code.sololearn.com/cxUJ6jenJPY1/?ref=app
https://code.sololearn.com/cxUJ6jenJPY1/?ref=app

Answer 1

Change

radius = input("Enter radius: ")

to

radius = int(input("Enter radius: "))

- When you use input(), what is stored in the variable is of 'str' datatype, not 'int'. Casting the variable to an int first will do the trick.

Answer 2

Use isdigit() first to check if the string only contains digits, then convert it to an int:

import math

radius = input("Enter radius: ")

if radius.isdigit():
area= math.pi * int(radius) ** 2
print("The area of your circle is:", area)
else:
print("That is not a valid number")

Answer 3

Thank you people for your responses. I appreciate. I have a learnt something from your answers. I also discovered another way to do it.

import math

while True:
try:
radius = int(input("Enter radius"))
break
except:
print("That is not a valid number")

area = math.pi * radius ** 2
print("The area of your circle is: ")

Answer 4

Jericho Arcelao Thank you for response. However I stil get the same error when I change input type to int like you suggested. What I am trying to do is to make sure the user inputs an integer otherwise they would get a message telling them the character entered is not a valid number

Answer 5

Jan Markus thank you but I am still having the same issue.

Answer 6

import math

radius = int(input("Enter radius: "))
if type(radius) is int:
area= math.pi * radius ** 2
print("The area of your circle is:", area)
else:
print("That is not a valid number")

Answer 7

Thank you Jericho Arcelao. The isdigit function worked.

Answer 8

Fery Ardiansyah thanks for your response. Your code works if user inputs an integer but gives a Traceback error when you enter anything else