[实验任务四]：****电子钟
设计一款电子钟类，用于显示时、分、秒
实验要求：
\1. 含有形参有默认值的默认构造函数；
\2. 重载 前缀++ 和 后缀—用于调整时间，每次调整均对秒进行调整，若秒满60，则分加1，若分满60则时加1，时满24，则清零重新开始；
\3. 重载插入运算符 >> 用于输入（设定）时间；
\4. 重载插入运算符 << 用于输出时间。
#include<iostream>
using namespace std;
class Clock
{
friend ostream& operator<<(ostream& out, Clock &c);
friend istream& operator>>(istream& in, Clock& c);
public:
Clock(int h=0,int m=0,int s=0):hour(h),minute(m),second(s){}
Clock& operator++();
Clock& operator--(int);
private:
int hour, minute, second;
};
Clock& Clock::operator++()
{
second++;
return *this;
}
Clock& Clock::operator--(int)
{
Clock temp = (*this);
second--;
return temp;
}
ostream& operator<<(ostream& out, Clock &c)
{
if (c.second >= 60)
{
++c.minute;
c.second -= 60;
}
if (c.minute >= 60)
{
++c.hour;
c.minute -= 60;
}
if (c.hour == 24)
{
c.hour = 0;
}
if (c.second < 0)
{
--c.minute;
c.second += 60;
}
if (c.minute < 0)
{
--c.hour;
c.minute += 60;
}
if (c.hour < 0)
{
c.hour += 24;
}
out << c.hour << " 时 " << c.minute << " 分 " << c.second << " 秒 " << endl;
return out;
}
istream& operator>>(istream& in, Clock& c)
{
cout << "请输入时间：";
in >> c.hour >> c.minute >> c.second;
return in;
}
int main()
{
Clock c1;
cin >> c1;
cout << c1;
++c1;
cout << c1;
c1--;
cout << c1;
}
[实验任务五]：****分数类
定义一个分数类，包含分子、分母
实验要求：
\1. 含有无参的默认构造函数，并进行构造函数的重载；
\2. 重载分数的加法+、减法-、数乘*这三运算符；
\3. 重载分数的输入和输出运算符；
\4. 重载分数的关系运算符==，!=，>=，<=；
\5. 定义约简函数，使分子分母没有公因子。
#include<iostream>
using namespace std;
int big(int a, int b)
{
int t = (a > b) ? a : b;
while (1)
{
if ((t % a == 0) && (t % b == 0))
{
return t;
}
t++;
}
}
class Fen
{
friend Fen& operator+(Fen& f1, Fen& f2);
friend Fen& operator-(Fen& f1, Fen& f2);
friend Fen& operator*(Fen& f1, Fen& f2);
friend ostream& operator<<(ostream& out, Fen& f);
friend istream& operator>>(istream& in, Fen& f);
public:
Fen(){}
Fen(int m,int z):mu(m),zi(z){}
Fen& operator*(Fen& f)
{
zi *= f.zi;
mu *= f.mu;
return (*this);
}
bool operator==(Fen& f)
{
if (mu == f.mu && zi == f.zi)
{
return true;
}
else
{
return false;
}
}
bool operator!=(Fen& f)
{
if (mu != f.mu && zi != f.zi)
{
return true;
}
else
{
return false;
}
}
bool operator>=(Fen& f)
{
int temp = big(mu, f.mu);
if ((temp / mu) * zi >= (temp / f.mu) * f.zi)
{
return true;
}
else
{
return false;
}
}
bool operator<=(Fen& f)
{
int temp = big(mu, f.mu);
if ((temp / mu) * zi <= (temp / f.mu) * f.zi)
{
return true;
}
else
{
return false;
}
}
private:
int mu, zi;
};
Fen& operator+(Fen& f1,Fen &f2)
{
Fen temp;
if (f1.mu == f2.mu)
{
temp.zi = f1.zi + f2.zi;
temp.mu = f1.mu;
}
else
{
int temp1 = big(f1.mu, f2.mu);
temp.zi = (temp1 / f1.mu) * f1.zi + (temp1 / f2.mu) * f2.zi;
temp.mu = temp1;
}
return temp;
}
Fen& operator-(Fen& f1, Fen& f2)
{
Fen temp;
if (f1.mu == f2.mu)
{
temp.zi = f1.zi - f2.zi;
temp.mu = f1.mu;
}
else
{
int temp1 = big(f1.mu, f2.mu);
temp.zi = (temp1 / f1.mu) * f1.zi - (temp1 / f2.mu) * f2.zi;
temp.mu = temp1;
}
return temp;
}
Fen& operator*(Fen& f1, Fen& f2)
{
Fen temp;
temp.mu = f1.mu * f2.mu;
temp.zi = f1.zi * f2.zi;
return temp;
}
ostream& operator<<(ostream& out, Fen& f)
{
out << f.zi << "/" << f.mu << " ";
return out;
}
istream& operator>>(istream& in, Fen& f)
{
cout << "请依次输入分子分母: ";
in >> f.zi >> f.mu;
return in;
}
int main()
{
Fen f1, f2;
cin >> f1 >> f2;
if (f1 >= f2)
{
cout << "大于" << endl;
}
if (f1 <= f2)
{
cout << "小于" << endl;
}
if (f1 == f2)
{
cout << "相等" << endl;
}
if (f1 != f2)
{
cout << "不相等" << endl;
}
Fen f3 = f1 + f2;
Fen f4 = f1 - f2;
cout << f1;
cout << f2;
cout << f3;
cout << f4;
}
