Asking the user about the radius of the circle and will solve the area and the circumference

Question

I am making a class similar code to this but I don't know how I will make it into a input function.

How would I ask the user to input a radius of a circle?

class Circle:
    def __init__(self, r):
        self.radius = r
    def area(self):
        return 3.14 * (self.radius ** 2)
    def perimeter(self):
        return 2*3.14*self.radius
obj = Circle(3)
print("Area of circle:",obj.area())
print("Perimeter of circle:",obj.perimeter())

There is a function "input" (for Python 3.x) to retrieve input from the user. Or what exactly is the problem? — Michael Butscher, Feb 28 '22 at 16:22
Does this answer your question? [Example of Class with User Input](https://stackoverflow.com/questions/32721580/example-of-class-with-user-input) — Stefan, Feb 28 '22 at 16:22
thanks @kpie I am close to that actually, but I didn't know I can place the "Circle" there — Beginner to everything, Feb 28 '22 at 16:24

score 3 · Answer 1 · answered Feb 28 '22 at 16:26

3

You just have to replace the argument to an input function to take input from the user. So the code will be changed from

obj = Circle(3)

to

obj = Circle(int(input("Please Enter Radius:")))

The int() before the input function is to convert the input from string to an integer. To know more about taking input from user, please check out here.

answered Feb 28 '22 at 16:26

Adnan Taufique

379
1
9

1

You're welcome. Keep learning and have fun. :) – Adnan Taufique Feb 28 '22 at 16:35

score 1 · Answer 2 · answered Feb 28 '22 at 16:26

1

class Circle:
    def __init__(self, r):
        self.radius = r
    def area(self):
        return 3.14 * (self.radius ** 2)
    def perimeter(self):
        return 2*3.14*self.radius
obj = Circle(int(input("Enter Radius:")))
#obj = Circle()
print("Area of circle:",obj.area())
print("Perimeter of circle:",obj.perimeter())

answered Feb 28 '22 at 16:26

Beginner to everything

63
8

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Feb 28 '22 at 16:52

Asking the user about the radius of the circle and will solve the area and the circumference

2 Answers2