planetMaker

print('1 (massAndDensity), 2 (gravityAndRadius), or 3 (massAndRadius)')

equation = input('choose equation input type: ')

equation = int(equation)

if equation == 3:

    print('you chose mass and radius.')

    mass = input('input mass in Earth masses: ')

    radius = input('input radius in Earth radii: ')

    mass = float(mass)

    radius = float(radius)

    gravity = mass / radius ** 2

    density = gravity / radius

    density = density * 5.513

    print ('gravity in Earth Gees: ',gravity)

    print ('density in g/cm^3: ', density)

if equation == 2:

    print('you chose gravity and radius.')

    gravity = input('input gravity in Earth Gees: ')

    radius = input('input radius in Earth radii: ')

    gravity = float(gravity)

    radius = float(radius)

    mass = gravity * radius ** 2

    density = gravity / radius

    density = density * 5.513

    print ('mass in Earth Masses: ', mass)

    print ('density in g/cm^3', density)

if equation == 1:

    print ('you chose mass and density')

    mass = input('input mass in Earth masses: ')

    density = input('input density in g/cm^3: ')

    mass = float(mass)

    density = float(density)

    density = density / 5.513

    import math

    radius = mass**(1/3) / density**(1/3)

    gravity = radius * density

    print ('radius in Earth radii: ', radius)

    print ('gravity in Earth Gees: ', gravity)