Python help with attempt

Question

I need help in solving the following in python:

Write a python script that inputs 3 decimal numbers, a, b and c from the user. Calculate the result of the following equation and display the result. The output should be formatted the same as the sample run below.

r= ((ab) + (bc) + (ca)) / (a+b+c))

Sample run:

Enter a: 2.6
Enter b: 4.5
Enter c: 1.8
The result of the calculation is 2.75

My attempt was:
a=str(input(‘Enter a: ‘))
b=str(input (‘Enter b: ‘))
c= str(input (‘Enter c: ‘))

print (“The result of the calculation is “ + ((a*b) + (b*c) + (c*a)) / (a+b+c))

(i keep on getting errors for the last print part and I dont know how to ask the program to take only 2 numbers after the decimal point for the result of the calculation).

Answer 1

A little formatting.

a=float(input('Enter a: '))
b=float(input ('Enter b: '))
c=float(input ('Enter c: '))
r=((a*b) + (b*c) + (c*a)) / (a+b+c)
print ("The result of the calculation is "+"{0:.2f}".format(r))

Answer 2

probably because you are multiplying a string by a string. the firat 3 lines in your attempt gets all the numbers, but turns them into strings. try:

a = float(input("Enter a: ")
...

Then you just need to round the answer. you could set that result equal to a variable, then by using round() or with some fancy formatting, you can drop off all the extra stuff after the decimal.

Answer 3

Convert input() to float with

float(input("Enter something:"))

You are converting input() to str.