4.22

所花时间：4小时

代码量：43

博客篇：1

python

设计异常处理类Cexception，并基于异常处理类设计并实现日期类Date

【题目描述】

【题目描述】

定义一个异常类Cexception解决日期类实现中的自定义异常处理。设计的日期类应包含以下内容：

①  有三个成员数据：年、月、日；

②  有设置日期的成员函数；

③  有用格式"月/日/年"输出日期的成员函数；

④  要求在日期设置及有参构造函数中添加异常处理。

【源代码程序】

class Cexception :
    def __init__(self,year,month,day):
        if Cexception.judge(year,month,day) :
            self.year = year
            self.month = month
            self.day = day
        else:
            self.year = -1
            self.month = -1
            self.day = -1
            print("日期有误")
    def setTime(self,year,month,day):
        if Cexception.judge(year,month,day) :
            self.year = year
            self.month = month
            self.day = day
        else:
            self.year = -1
            self.month = -1
            self.day = -1
            print("日期有误")
    def display(self):
        if self.month ==-1 or  self.year == -1 or self.day == -1:
            print("",end="")
        else:
            print(str(self.month)+"/"+str(self.day)+"/"+str(self.year))
    def judge(year,month,day):
        leap = False
        legal = False
        if year>0:
            if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:
                leap = True
            if month in [1, 3, 5, 7, 8, 10, 12]:
                if 1 <= day <= 31:
                    legal = True
            elif month in [4, 6, 9, 11]:
                if 1 <= day <= 30:
                    legal = True
            elif month == 2:
                if not leap and 1 <= day <= 28:
                    legal = True
                elif leap and 1 <= day <= 29:
                    legal = True
        else:
            legal = False
        return legal

c = Cexception(-1,11,2)
c.display()
c = Cexception(2019,11,2)
c.display()
c = Cexception(2019,2,29)
c.display()
c = Cexception(2020,2,29)
c.display()

设计并实现平面点类Point

【题目描述】

定义一个平面点类Point，对其重载运算符关系运算符，关系运算以距离坐标原点的远近作为基准，远的为大。程序完成对其的测试。

【源代码程序】

import math
class Point():
    def __init__(self,x,y):
        self.x = x
        self.y = y
    def __lt__(self, other):
        l1 = math.sqrt(self.x**2+self.y**2)
        l2 = math.sqrt(other.x**2+other.y**2)
        return l1<l2
    def __le__(self, other):
        l1 = math.sqrt(self.x**2+self.y**2)
        l2 = math.sqrt(other.x**2+other.y**2)
        return l1<=l2
    def __gt__(self, other):
        l1 = math.sqrt(self.x**2+self.y**2)
        l2 = math.sqrt(other.x**2+other.y**2)
        return l1>l2
    def __ge__(self, other):
        l1 = math.sqrt(self.x**2+self.y**2)
        l2 = math.sqrt(other.x**2+other.y**2)
        return l1>=l2
    def __eq__(self, other):
        l1 = math.sqrt(self.x**2+self.y**2)
        l2 = math.sqrt(other.x**2+other.y**2)
        return l1==l2
    def __ne__(self, other):
        l1 = math.sqrt(self.x**2+self.y**2)
        l2 = math.sqrt(other.x**2+other.y**2)
        return l1!=l2

p1 = Point(1,2)
p2 = Point(3,4)
p=p1<p2
print(p)
p=p1<=p2
print(p)
p=p1>p2
print(p)
p=p1>=p2
print(p)
p=p1==p2
print(p)
p=p1!=p2
print(p)