# Miller-Ranum non-animated class Planet
# (combined listings 10.1, 10.2, 10.3 and 10.6)

import math

class Planet:
    def __init__(self, iname, irad, im, idist):
        self.name = iname
        self.radius = irad
        self.mass = im
        self.distance = idist

    def getName(self):
        return self.name
    
    def getRadius(self):
        return self.radius
    
    def getMass(self):
        return self.mass

    def getDistance(self):
        return self.distance


    def getVolume(self):
        v = 4.0/3 * math.pi * self.radius**3
        return v
    
    def getSurfaceArea(self):
        sa = 4.0 * math.pi * self.radius**2
        return sa
    
    def getDensity(self):
        d = self.mass / self.getVolume()
        return d
        
    def __str__(self):
        return self.name
        
        
# sample session:
myplanet = Planet("X25",45,198,1000)

print("my planet: ", myplanet)

volume = myplanet.getVolume()
density = myplanet.getDensity()

print("volume: {:.2f}".format(volume))
print("density: {:e}".format(density))