Add Fractions

Problem

Add the fractions num1/den1 and num2/den2 and return the reduced result as [numerator, denominator] with a positive denominator.

Cross-multiply to add, then divide both parts by their greatest common divisor. A zero result is written as [0, 1].

Hint

gcd(0, x) is x, so the same reduction code handles a zero numerator.

case 1

in: [1,2,1,3]

expected: [5,6]

case 2

in: [1,4,1,4]

expected: [1,2]

case 3

in: [1,2,1,2]

expected: [1,1]

case 4

in: [0,5,1,5]

expected: [1,5]

case 5

in: [1,6,-1,6]

expected: [0,1]

Starter codePython

def add_fractions(num1, den1, num2, den2):
    # Your code here
    pass

5 test cases · run your code against them in the editor