1.写出程序的运行结果
class P1:
def foo(self):
print('callable P1-foo')
class P2:
def foo(self):
print('callable P2-foo')
def bar(self):
print('callable P2-bar')
class C1(P1,P2):
pass
class C2(P1,P2):
def bar(self):
print('callable C2-bar()')
class GC(C1,C2):
pass
gc=GC()
gc.foo()
gc.bar()
3.写出程序的运行结果
import math
class Circle:
def __init__(self, radius):
self.radius=radius
def getRadius(self):
return self.radius
def getArea(self):
return math.pi*self.radius*self.radius
def main():
c1=Circle(10)
print(c1.getRadius())
print('{:7.2f}'.format(c1.getArea()))
if __name__=='__main__':
main()
4.定义一个 Circle 类,根据圆的半径求周长和面积。再由 Circle 类创建两个 圆对象,其半径分别为 5 和 10,要求输出各自的周长和面积。请补充程序
import math
class Circle:
def __init__(self,radius=5): #完成构造函数
self.radius=radius
def getPerimeter(self):
return 2*math.pi*self.radius
def getArea(self):
return math.pi*self.radius*self.radius
c1=Circle()
c2=Circle(10) #向构造函数传递新的参数
print(c1.radius, c1.getPerimeter(), c1.getArea())
print(c2.radius, c2.getPerimeter(), c2.getArea())
4.利用面向对象方法求 n!,并输出 10!的值
class Factorial:
def fac (self,num):
factorial = 1
for i in range(1,num+1):
factorial *= i
return factorial
if __name__ == '__main__':
factorial = Factorial()
n=int(input('请输入n:'))
print(n,'!=',factorial.fac(n))
5.定义 change 类,用以实现角度和弧度之间的转换
class Change:
import math
def rad_to_ang(self,radian):
return radian*180/math.pi
def ang_to_rad(self,angle):
return angle*math.pi/180
if __name__ == '__main__':
import math
change=Change()
print('{0}弧度 = {1}°'.format(math.pi,change.rad_to_ang(math.pi)))
print('{0}° = {1}弧度'.format(90,change.ang_to_rad(90)))
6.设计点类,并为这个点类设置一个方法来计算两点之间的距离
class Point:
def cal_distance (self,p1,p2):
import math
return math.sqrt(math.pow((p2[0] - p1[0]), 2) + math.pow((p2[1] - p1[1]), 2))
if __name__ == '__main__':
point=Point()
p1=[0,0]
p2=[1,1]
print('点{0}与点{1}之间的距离是{2}'.format(p1,p2,point.cal_distance(p1,p2)))
7.设计长方形类,并用其成员函数计算两个给定的长方形的周长和面积
class Rectangle:
def get_perimeter(self,length,width):
return 2*(length+width)
def get_area(self,length,width):
return length*width
if __name__ == '__main__':
rectangle=Rectangle()
print('长{0}宽{1}的长方形:周长={2},面积={3}'.format(3,4,rectangle.get_perimeter(3,4),rectangle.get_area(3,4)))
print('长{0}宽{1}的长方形:周长={2},面积={3}'.format(11,11,rectangle.get_perimeter(3,4),rectangle.get_area(3,4)))
8.已有若干个学生数据,这些数据包括学号,姓名,程序设计基础成绩,高等 数学成绩和英语成绩,要求定义学生类,并用其成员函数求各门课程的平均分
class Student:
def __init__(self,id,name,program,math,english):
self.id=id
self.name=name
self.program=program
self.math=math
self.english=english
@staticmethod
def get_avg(*students):
program_total=0
math_total=0
english_total=0
for i in range(len(students)):
program_total += students[i].program
math_total += students[i].math
english_total += students[i].english
return [program_total/len(students),math_total/len(students),english_total/len(students)]
if __name__ == '__main__':
student1=Student('001','张三',55,55,55)
student2=Student('002','李四',66,66,66)
student3=Student('003','王五',77,77,77)
students=[student1,student2,student3]
print('平均分\n程序设计基础:{0},高等数学:{1},英语:{2}'.format(Student.get_avg(*students)[0],Student.get_avg(*students)[1],Student.get_avg(*students)[2]))