can't multiply sequence by non-int type 'float'-CodePudding

I'm trying to get this to work. The error I am getting is that I can't multiply sequence by non-int type 'float'.

import math

radius = input("hva er radiusen? ")
høyde = input("hva er høyden? ")

mOmkrets = (radius * math.tau)
Areal_sirkel = (math.pi * radius**2)


print("omkrets av høyden = ", (math.tau * {radius}))
print("Areal av sirkelen = ", math.pi * {radius}**2)
print("Areal av sylinderen = ", math.tau * {radius} * {høyde} 2 * {Areal_sirkel})

CodePudding user response：

By default, input() returns string. But, we can't use a string to arithmetic operations like addition, multiplication, etc. Hence, place holder variables {} is just used for complex variable substitutions and value formatting.
For example,

name = "James"
age = 20
print("my name is {name} my age is {age}".format(name=name, age=age))

Inorder to handle this problem, you can convert your input variables to integer or float using int() or float() and use the variables without curly braces.

import math

radius = float(input("hva er radiusen? "))
høyde = float(input("hva er høyden? "))

mOmkrets = (radius * math.tau)
Areal_sirkel = (math.pi * radius**2)


print("omkrets av høyden = ", math.tau * radius)
print("Areal av sirkelen = ", math.pi * radius**2)
print("Areal av sylinderen = ", math.tau * radius * høyde  2 * Areal_sirkel)

CodePudding user response：

Have you tried converting the variables to a common type? Try: float(radius) and float(høyde) Probably python assigns integer to the inputs if you enter integer values.