Question

PYTHON WHILE Write a program that prompts for and reads the number ? of spheres to be processed. If ?≤0 your program must display an error message and terminate; otherwise it does the following for ? times:

• Write a program that prompts for and reads the number ?n of spheres to be processed. If ?≤0n≤0 your program must display an error message and terminate; otherwise it does the following for ?n times:
  • Prompts for and reads the volume of a sphere, it then displays the surface area of the sphere with that volume. Assume that each volume is in cubic centimeters.
• The program finally displays the average of the surface areas of the ?n spheres.
• Please note that
  • ?=3.14159π=3.14159.
  • volume =43??3=43πr3.
  • surface area =4??2=4πr2.
• The following are sample runs of the program.

Answer 1

#user input for number of spheres
noOfSpheres = int(input("How many spheres? "))

#if no of spheres is 0 or less it will terminate with error msg
if(noOfSpheres <= 0)  :
    print("Number of spheres must be 1 or more.")
    #to terminate program
    quit()
   
#to store volume of each sphere
volumeList = []

#user input of volume for each sphere
for i in range(noOfSpheres):
    
    #it will ask for volume and store it in volume variable
    volume = input("Enter Volume for shere " + str(i+1) + " in cubic centimeters : ")
    
    #add entered volume in volumeList
    volumeList.append(volume)

#to store area for each sphere    
areaList = []

#constant value of PI
PI = 3.14159

#to store average surface area
avg = 0

#to maintain sphere counter
i = 0

#find surface area for each sphere and calculate average surface area
for volume in volumeList :
    
    #to calculate radius
    radius = ((3 * float(volume))/(4 * PI))**(1/3)
    
    #to calculate area
    area = 4 * PI * (radius)**2
    
    #to calculate total sum of surface area
    avg = avg + area
    
    #sphere counter is increamented by 1
    i = i + 1
    
    #prints area of each sphere
    print("area for sphere " + str(i) + " is : " + str(area))
    
    #add area in areaList
    areaList.append(area)

#calculating final average sphere area value
avg = avg / noOfSpheres

#prints avearge sphere surface area
print("Average area for all spheres : " + str(avg))

Sample output :