python 计算 圆的面积 python计算圆的面积和体积

#!/usr/bin/env python
 #encoding=UTF-8import math
#正方形的面积
 def square_mianji(x):
 return x*x#立方体的表面积
 def cube(x):
 return xx6#立方体的体积
 def square_volume(x):
 return pow(x,3)#圆的面积
 def circle®:
 return math.pirr
 #球的表面积
 def ball_area®:
 return 4rr*math.pi#球的体积
 def ball_volume®:
 return (4math.pirrr)/3if name"main":
 a=input(“please input 1 to calculate square’s area,input 2 to calculate cube’s area and volume,input 3 to calculate circle’s area,input 4 to calculate ball’s area and volume:”)
 a=int(a)
 if a1:
 b=input(“please input the square’s length of side:”)
 print(“the square’s area is {}”.format(square_mianji(int(b))))
 elif a2:
 b=input(“please input the cube’s length of side:”)
 print(“the cube’s area is {},the volume is {}”.format(cube(int(b)),square_volume(int(b))))
 elif a3:
 b=input(“please input the circle’s radius:”)
 print(“the circle’s area is {}”.format(circle(int(b))))
 elif a==4:
 b=input(“please input the ball’s radius:”)
 print(“the ball’s area is {},the volume is {}”.format(ball_area(int(b)),ball_volume(int(b))))
 else:
 print(“your input is wrong”)