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【c++】第十二周上机实践作业 项目 2

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/*
 *copyright(c) 2016,烟台大学计算机学院
 *All rights reserved
 *文件名称:test.cpp
 *作者:谭泽纯
 *版本:v6.0
 *
 *问题描述:



实现Time类中的运算符重载。

<code class="hljs cpp has-numbering"><span class="hljs-keyword">class</span> CTime
{
<span class="hljs-keyword">private</span>:
    <span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">short</span> <span class="hljs-keyword">int</span> hour;    <span class="hljs-comment">// 时</span>
    <span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">short</span> <span class="hljs-keyword">int</span> minute;  <span class="hljs-comment">// 分</span>
    <span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">short</span> <span class="hljs-keyword">int</span> second;  <span class="hljs-comment">// 秒</span>
<span class="hljs-keyword">public</span>:
    CTime(<span class="hljs-keyword">int</span> h=<span class="hljs-number">0</span>,<span class="hljs-keyword">int</span> m=<span class="hljs-number">0</span>,<span class="hljs-keyword">int</span> s=<span class="hljs-number">0</span>);
    <span class="hljs-keyword">void</span> setTime(<span class="hljs-keyword">int</span> h,<span class="hljs-keyword">int</span> m,<span class="hljs-keyword">int</span> s);
    <span class="hljs-keyword">void</span> display();
    <span class="hljs-comment">//二目的比较运算符重载</span>
    <span class="hljs-keyword">bool</span> <span class="hljs-keyword">operator</span> > (CTime &t);
    <span class="hljs-keyword">bool</span> <span class="hljs-keyword">operator</span> < (CTime &t);
    <span class="hljs-keyword">bool</span> <span class="hljs-keyword">operator</span> >= (CTime &t);
    <span class="hljs-keyword">bool</span> <span class="hljs-keyword">operator</span> <= (CTime &t);
    <span class="hljs-keyword">bool</span> <span class="hljs-keyword">operator</span> == (CTime &t);
    <span class="hljs-keyword">bool</span> <span class="hljs-keyword">operator</span> != (CTime &t);

    <span class="hljs-comment">//二目的加减运算符的重载</span>
    <span class="hljs-comment">//返回t规定的时、分、秒后的时间</span>
    <span class="hljs-comment">//例t1(8,20,25),t2(11,20,50),t1+t2为19:41:15</span>
    CTime <span class="hljs-keyword">operator</span>+(CTime &t);
    CTime <span class="hljs-keyword">operator</span>-(CTime &t);<span class="hljs-comment">//对照+理解</span>
    CTime <span class="hljs-keyword">operator</span>+(<span class="hljs-keyword">int</span> s);<span class="hljs-comment">//返回s秒后的时间</span>
    CTime <span class="hljs-keyword">operator</span>-(<span class="hljs-keyword">int</span> s);<span class="hljs-comment">//返回s秒前的时间</span>
    <span class="hljs-comment">//二目赋值运算符的重载</span>
    CTime &<span class="hljs-keyword">operator</span>+=(CTime &c);
    CTime &<span class="hljs-keyword">operator</span>-=(CTime &c);
    CTime &<span class="hljs-keyword">operator</span>+=(<span class="hljs-keyword">int</span> s);<span class="hljs-comment">//返回s秒后的时间</span>
    CTime &<span class="hljs-keyword">operator</span>-=(<span class="hljs-keyword">int</span> s);<span class="hljs-comment">//返回s秒前的时间</span>
    <span class="hljs-comment">//一目运算符的重载</span>
    CTime <span class="hljs-keyword">operator</span>++(<span class="hljs-keyword">int</span>);<span class="hljs-comment">//后置++,下一秒</span>
    CTime &<span class="hljs-keyword">operator</span>++();<span class="hljs-comment">//前置++,下一秒</span>
    CTime <span class="hljs-keyword">operator</span>--( <span class="hljs-keyword">int</span>);<span class="hljs-comment">//后置--,前一秒</span>
    CTime &<span class="hljs-keyword">operator</span>--();<span class="hljs-comment">//前置--,前一秒</span>
};</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li></ul><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li></ul>

  提示1:并不是所有比较运算重载函数都很复杂

<code class="hljs cs has-numbering"><span class="hljs-comment">//比较运算返回的是比较结果,是bool型的true或false</span>
<span class="hljs-comment">//可以直接使用已经重载了的运算实现新运算,例如果已经实现了 > ,则实现 <= 就可以很方便了……</span>
<span class="hljs-keyword">bool</span> CTime::<span class="hljs-keyword">operator</span> <= (CTime &t) <span class="hljs-comment">// 判断时间t1<=t2</span>
{
    <span class="hljs-keyword">if</span> (*<span class="hljs-keyword">this</span> > t) <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>;
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li></ul><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li></ul>

  甚至可以如下面的代码般简练:

<code class="hljs cs has-numbering"><span class="hljs-keyword">bool</span> CTime::<span class="hljs-keyword">operator</span> <= (CTime &t){<span class="hljs-keyword">return</span> !(*<span class="hljs-keyword">this</span> > t)}</code><ul style="" class="pre-numbering"><li>1</li></ul><ul style="" class="pre-numbering"><li>1</li></ul>

  提示2:并不是所有复合赋值运算重载函数都需要很复杂

<code class="hljs cs has-numbering"><span class="hljs-comment">//可以直接使用已经重载了的加减运算实现</span>
<span class="hljs-comment">//这种赋值, 例如 t1+=20,直接改变当前对象的值,所以在运算完成后,将*this作为返回值</span>
CTime &CTime::<span class="hljs-keyword">operator</span>+=(CTime &c)
{
    *<span class="hljs-keyword">this</span>=*<span class="hljs-keyword">this</span>+c;
    <span class="hljs-keyword">return</span> *<span class="hljs-keyword">this</span>;
}</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li></ul><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li></ul>

  提示3:请自行编制用于测试的main()函数,有些结果不必依赖display()函数,提倡用单步执行查看结果


*/



答案

#include <iostream>
using namespace std;
class CTime
{
private:
    unsigned short int hour;    // 时
    unsigned short int minute;  // 分
    unsigned short int second;  // 秒
public:
    CTime(int h=0,int m=0,int s=0);
    void setTime(int h,int m,int s);

    //输入输出运算的重载
    friend istream &operator>>(istream &in,CTime &t);
    friend ostream &operator<<(ostream &out,CTime t);
    //比较运算符(二目)的重载
    bool operator > (CTime &t);
    bool operator < (CTime &t);
    bool operator >= (CTime &t);
    bool operator <= (CTime &t);
    bool operator == (CTime &t);
    bool operator != (CTime &t);
    //二目运算符的重载
    CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间,例t1(8,20,25),t2(11,20,50),t1+t2为:41:15
    CTime operator-(CTime &c);//对照+理解
    CTime operator+(int s);//返回s秒后的时间
    CTime operator-(int s);//返回s秒前的时间
    //一目运算符的重载
    CTime operator++(int);//后置++,下一秒
    CTime &operator++();//前置++,下一秒
    CTime operator--(int);//后置--,前一秒
    CTime &operator--();//前置--,前一秒
    //赋值运算符的重载
    CTime &operator+=(CTime &c);
    CTime &operator-=(CTime &c);
    CTime &operator+=(int s);//返回s秒后的时间
    CTime &operator-=(int s);//返回s秒前的时间
};


CTime::CTime(int h,int m,int s)
{
    hour=h;
    minute=m;
    second=s;
}

void CTime::setTime(int h,int m,int s)
{
    hour=h;
    minute=m;
    second=s;
}




//!!!
ostream &operator<<(ostream &out,CTime t)
{
    out<<t.hour<<‘:‘<<t.minute<<‘:‘<<t.second;
    return out;
}



bool CTime::operator > (CTime &t)
{
    if (hour>t.hour) return true;
    if (hour<t.hour) return false;
    if (minute>t.minute) return true;
    if (minute<t.minute) return false;
    if (second>t.second) return true;
    return false;
}

bool CTime::operator < (CTime &t)
{
    if (hour<t.hour) return true;
    if (hour>t.hour) return false;
    if (minute<t.minute) return true;
    if (minute>t.minute) return false;
    if (second<t.second) return true;
    return false;
}

bool CTime::operator == (CTime &t)
{
    if (*this<t || *this>t)
        return false;
    return true;
}

bool CTime::operator != (CTime &t)
{
    if (*this==t) return false;
    return true;
}

bool CTime::operator >= (CTime &t)
{
    if (*this<t) return false;
    return true;
}

bool CTime::operator <= (CTime &t)
{
    if (*this>t) return false;
    return true;
}


CTime CTime::operator + (CTime &t)
{

    int h,m,s;
    s=second+t.second;
    m=minute+t.minute;
    h=hour+t.hour;
    if (s>59)
    {
        s-=60;
        m++;
    }
    if (m>59)
    {
        m-=60;
        h++;
    }
    while (h>23) h-=24;
    CTime t0(h,m,s);
    return t0;
}


CTime CTime::operator+(int s)
{
    int ss=s%60;
    int mm=(s/60)%60;
    int hh=s/3600;
    CTime t0(hh,mm,ss);
    return *this+t0;
}


CTime CTime::operator - (CTime &t)
{
    int h,m,s;
    s=second-t.second;
    m=minute-t.minute;
    h=hour-t.hour;
    if (s<0)
    {
        s+=60;
        m--;
    }
    if (m<0)
    {
        m+=60;
        h--;
    }
    while (h<0) h+=24;
    CTime t0(h,m,s);
    return t0;
}

 /////////////////////////老师方法更妙
CTime CTime::operator-(int s)
{
    int ss=s%60;
    int mm=(s/60)%60;
    int hh=s/3600;
    CTime t0(hh,mm,ss);
    return *this-t0;
}

////////////////////区分引用和非引用。   一个是返回自己,一个是重新返回一个类
CTime CTime::operator++(int)
{
    CTime t=*this;
    *this=*this+1;
    return t;
}

CTime &CTime::operator++()
{
    *this=*this+1;
    return *this;
}

CTime CTime::operator--(int)
{
    CTime t=*this;
    *this=*this-1;
    return t;
}

CTime &CTime::operator--()
{
    *this=*this-1;
    return *this;
}


CTime &CTime::operator+=(CTime &c)
{
    *this=*this+c;
    return *this;
}
CTime &CTime::operator-=(CTime &c)
{
    *this=*this-c;
    return *this;
}
CTime &CTime::operator+=(int s)
{
    *this=*this+s;
    return *this;
}
CTime &CTime::operator-=(int s)
{
    *this=*this-s;
    return *this;
}

////////////使用老师的进行测试(》》运载符没用)
int main()
{
    CTime t1,t2,t;

    cout<<"t1为:";
    CTime t1(1,2,3);
    cout<<"t2为:";
     CTime t2(4,5,6);
    cout<<"下面比较两个时间大小:\n";
    if (t1>t2) cout<<"t1>t2"<<endl;
    if (t1<t2) cout<<"t1<t2"<<endl;
    if (t1==t2) cout<<"t1=t2"<<endl;
    if (t1!=t2) cout<<"t1≠t2"<<endl;
    if (t1>=t2) cout<<"t1≥t2"<<endl;
    if (t1<=t2) cout<<"t1≤t2"<<endl;
    cout<<endl;
    cout<<"t1= "<<t1<<endl;
    cout<<"t2= "<<t2<<endl;

    cout<<"t=t1++"<<endl;
    t=t1++;
    cout<<"t= "<<t<<"    t1= "<<t1<<endl;

    cout<<"t=++t1"<<endl;
    t=++t1;
    cout<<"t= "<<t<<"    t1= "<<t1<<endl;

    cout<<"t1+t2= "<<t1+t2<<endl;
    cout<<"t1-t2= "<<t1-t2<<endl;
    cout<<"t1+2000= "<<t1+2000<<endl;
    cout<<"t1-5000= "<<t1-5000<<endl;
    return 0;
}



    ostream & operator<<(ostream &out,CTime t)
    {
        out<<t.hour<<"  "<<t.minute<<"  "<<t.second;
        return out;
    }

 
    //二目的比较运算符重载
    bool CTime::operator > (CTime &t)
    {
    if (hour>t.hour) return true;
    if (hour<t.hour) return false;
    if (minute>t.minute) return true;
    if (minute<t.minute) return false;
    if (second>t.second) return true;
    return false;
    }
    bool CTime::operator < (CTime &t)
    {
    if (hour<t.hour) return true;
    if (hour>t.hour) return false;
    if (minute<t.minute) return true;
    if (minute>t.minute) return false;
    if (second<t.second) return true;
    return false;
    }
     bool CTime::operator == (CTime &t)
    {
        if(hour==t.hour&&minute==t.minute&&second==t.second)
            return true;
        else
            return false;
    }
    bool CTime::operator >= (CTime &t)
    {
        if(*this<t)
            return false;
        else
            return true;
    }
    bool CTime::operator <= (CTime &t)
    {
        if(*this>t)
            return false;
        else
            return true;
    }
 
    bool CTime::operator != (CTime &t)
    {
        if(*this!=t)
            return true;
        else
            return false;
    }

    //二目的加减运算符的重载
    //返回t规定的时、分、秒后的时间
    //例t1(8,20,25),t2(11,20,50),t1+t2为19:41:15
    CTime CTime::operator+(CTime &t)
    {
        int h,m,s,qw;
        h=hour+t.hour;
        m=minute+t.minute;
        s=second+t.second;
        if(s>=60)
        {
            qw=s/60;
            s=s%60;
            m=m+qw;
        }
        if(m>=60)
        {
            qw=m/60;
            m=m%60;
            h=h+qw;
        }
        if(h>23)
            h=h-24;
        return CTime(h,m,s);
    }

    CTime CTime::operator-(CTime &t)
    {
        int h,m,s;
        s=second-t.second;
        m=minute-t.minute;
         h=hour-t.hour;
          if (s<0)
          {
           s+=60;
            m--;
          }
         if (m<0)
         {
            m+=60;
            h--;
         }
         while (h<0) h+=24;
            CTime t0(h,m,s);
      return t0;
    }

    CTime CTime::operator+(int s) //!!!!用前面的
    {
        int ss=s%60;
        int mm=(s/60)%60;
        int hh=s/3600;
        CTime tt(hh,mm,ss);
        return *this+tt;
    }
        



               
            
    CTime CTime::operator-(int s)
    {
    int ss=s%60;
    int mm=(s/60)%60;
    int hh=s/3600;
    CTime tt(hh,mm,ss);
    return *this-tt;
    }
    
    CTime &CTime::operator+=(CTime &c)
    {
        *this=*this+c;
        return *this;
    }
    CTime &CTime::operator-=(CTime &c)
    {
    *this=*this-c;
    return *this;
}
    CTime &CTime::operator+=(int s)
        {
    *this=*this+s;
    return *this;
}
    CTime &CTime::operator-=(int s)
        {
    *this=*this-s;
    return *this;
}
   
    CTime CTime::operator++(int)
    {
         CTime t=*this;
         *this=*this+1;
         return t;
    }
    CTime &CTime::operator++()
    {
        *this=*this+1;
        return *this;
    }
    CTime CTime::operator--( int)
    {
         CTime t=*this;
         *this=*this-1;
         return t;
    }
    CTime &CTime::operator--()
    {
        *this=*this-1;
        return *this;
    }

int main()
{
    CTime t;

    cout<<"t1为:";
    CTime t1(1,2,3);
    cout<<"t2为:";
    CTime t2(4,5,6);
    cout<<"下面比较两个时间大小:\n";
    if (t1>t2) cout<<"t1>t2"<<endl;
    if (t1<t2) cout<<"t1<t2"<<endl;
    if (t1==t2) cout<<"t1=t2"<<endl;
    if (t1!=t2) cout<<"t1≠t2"<<endl;
    if (t1>=t2) cout<<"t1≥t2"<<endl;
    if (t1<=t2) cout<<"t1≤t2"<<endl;
    cout<<endl;
    cout<<"t1= "<<t1<<endl;
    cout<<"t2= "<<t2<<endl;

    cout<<"t=t1++"<<endl;
    t=t1++;
    cout<<"t= "<<t<<"    t1= "<<t1<<endl;

    cout<<"t=++t1"<<endl;
    t=++t1;
    cout<<"t= "<<t<<"    t1= "<<t1<<endl;

    cout<<"t1+t2= "<<t1+t2<<endl;
    cout<<"t1-t2= "<<t1-t2<<endl;
    cout<<"t1+2000= "<<t1+2000<<endl;
    cout<<"t1-5000= "<<t1-5000<<endl;
    return 0;
}



【c++】第十二周上机实践作业 项目 2

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原文地址:http://blog.csdn.net/little_boy_z/article/details/51383601

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