C++作业2

来源：互联网发布：bat软件测试招聘编辑：程序博客网时间：2024/06/07 23:48

一阅读、运行程序后，按要求增加类的功能

#include <iostream>  using namespace std;  class Time  {  public:      void add_a_sec();      void add_a_minute();      void add_an_hour();      void add_seconds(int);      void add_minutes(int);      void add_hours(int);      void set_time( );      void show_time( );     private:      bool is_time(int, int, int);   //这个成员函数设置为私有的，是合适的，请品味      int hour,minute,sec;      int t1,t2,t3;    };  void Time::add_a_sec()  {      t1=sec;      sec=sec+1;      t2=minute;      t3=hour;      if(sec==60)      {          minute=minute+1;          sec=00;          if(minute==60)          {              hour=hour+1;              minute=00;              if(hour==24)              {                  cout<<"<add_a_sec>无法显示"<<endl;              }              else cout<<"<add_a_sec>:"<<hour<<":"<<minute<<":"<<sec<<endl;          }      }      else cout<<"<add_a_sec>:"<<hour<<":"<<minute<<":"<<sec<<endl;  }  void Time::add_a_minute()  {      sec=t1;      minute=t2;      hour=t3;      minute=minute+1;      if(minute==60)      {          hour=hour+1;          minute=0;          if(hour==24)          {              cout<<"<add_a_minute>无法显示"<<endl;          }          else cout<<"<add_a_minute>:"<<hour<<":"<<minute<<":"<<sec<<endl;      }      else cout<<"<add_a_minute>:"<<hour<<":"<<minute<<":"<<sec<<endl;  }  void Time::add_an_hour()  {      sec=t1;      minute=t2;      hour=t3;      hour=hour+1;      if(hour==24)      {          cout<<"<add_an_hour>无法显示"<<endl;      }      else cout<<"<add_an_hour>:"<<hour<<":"<<minute<<":"<<sec<<endl;  }  void Time::add_seconds(int n)  {      sec=t1;      sec=sec+n;      minute=t2;      hour=t3;      if(sec>59)      {          minute=minute+sec/60;          sec=sec%60;          if(minute>59)          {              hour=hour+minute/60;              minute=minute%60;              if(hour==24)              {                  cout<<"<add_secs>无法显示"<<endl;              }              else cout<<"<add_secs>:"<<hour<<":"<<minute<<":"<<sec<<endl;          }          else cout<<"<add_secs>:"<<hour<<":"<<minute<<":"<<sec<<endl;      }      else cout<<"<add_secs>:"<<hour<<":"<<minute<<":"<<sec<<endl;  }  void Time::add_minutes(int n)  {      sec=t1;      minute=t2;      hour=t3;      minute=minute+n;      if(minute>=60)      {          hour=hour+minute/60;          minute=minute%60;          if(hour==24)          {              cout<<"<add_minutes>无法显示"<<endl;          }          else cout<<"<add_minutes>:"<<hour<<":"<<minute<<":"<<sec<<endl;      }      else cout<<"<add_minutes>:"<<hour<<":"<<minute<<":"<<sec<<endl;  }  void Time::add_hours(int n)  {      sec=t1;      minute=t2;      hour=t3;      hour=hour+n;      if(hour==24)      {          cout<<"<add_hours>无法显示"<<endl;      }      else cout<<"<add_hours>:"<<hour<<":"<<minute<<":"<<sec<<endl;  }  void Time::set_time( )  {      char c1,c2;      cout<<"请输入时间(格式hh:mm:ss)";      while(1)      {   cin>>hour>>c1>>minute>>c2>>sec;          if(c1!=':'||c2!=':')              cout<<"格式不正确，请重新输入"<<endl;          else if (!is_time(hour,minute,sec))              cout<<"时间非法，请重新输入"<<endl;          else              break;      }  }  void Time::show_time( )  {      cout<<hour<<":"<<minute<<":"<<sec<<endl;  }  bool Time::is_time(int h,int m, int s)  {      if (h<0 ||h>24 || m<0 ||m>60 || s<0 ||s>60)          return false;      return true;  }  int main()  {      Time t1;      t1.set_time();      t1.show_time();      t1.add_a_sec();      t1.add_a_minute();      t1.add_an_hour();      t1.add_seconds(40);      t1.add_minutes(40);      t1.add_hours(5);      return 0;  }

二、项目名称：正整数类

#include<iostream>  #include<cmath>  using namespace std;  class NaturalNumber  {private:      int n;  public:      void setValue (int x);//置数据成员n的值，要求判断是否是正整数      int getValue();  //返回私有数据成员n的值      bool isPrime();  //判断数据成员n是否为素数，是返回true，否则返回false      void printFactor();  //输出数据成员n的所有因子，包括1和n自身      bool isPerfect(); //判断数据成员n是否为完全数。若一个正整数n的所有小于n的因子之和等于n, 则称n为完全数, 如6=1+2+3是完全数。      bool isReverse(int x);//判断形式参数x是否为数据成员n的逆向数（例321是123的逆向数）。      bool isDaffodil(int x); //判断形式参数x是否是水仙花数。水仙花数的各位数字立方和等于该数，如153=1*1*1+5*5*5+3*3*3      void Daffodils(); //显示所有大于1，且小于数据成员n的水仙花数；  };  void NaturalNumber::setValue(int x)  {      n=x;      if(x>0)      {          cout<<n<<"是正整数"<<endl;      }      else cout<<n<<"不是正整数"<<endl;  }  int NaturalNumber::getValue()  {      return n;  }  bool NaturalNumber::isPrime()  {      int a,b;      for(a=2;a<n;a++)      {          b=n%a;          if(b==0)          break;      }      if(b==0)      return false;      else      return true;  }  void NaturalNumber::printFactor()  {      int a,b;      for(a=1;a<=n;a++)      {          b=n%a;          if(b==0)          cout<<a<<" ";      }      cout<<endl;  }  bool NaturalNumber::isPerfect()  {      int a,b,sum(0);      for(a=1;a<n;a++)      {          b=n%a;          if(b==0)          sum=sum+a;      }      if(sum==n)      return true;      else      return false;  }  bool NaturalNumber::isReverse(int x)  {      int a[80],i,j=0,sum=0;      for(i=0;n!=0;i++)      {          a[i]=n%10;          n=n/10;          j++;      }      for(i=0;i<j;i++)      {          sum=sum+pow(10,j-1-i)*a[i];      }      if(sum==x)      return true;      else      return false;  }  bool NaturalNumber::isDaffodil(int x)  {      int a[80],i,sum=0,t;      t=x;      for(i=0;x!=0;i++)      {          a[i]=x%10;          x=x/10;          sum=sum+a[i]*a[i]*a[i];      }      if(sum==t)      return true;      else      return false;  }  void NaturalNumber::Daffodils()  {      int j,t;      for(j=2;j<n;j++)      {          t=j;          int a[80],i,sum=0;          for(i=0;j!=0;i++)          {              a[i]=j%10;              j=j/10;              sum=sum+a[i]*a[i]*a[i];          }          j=t;          if(sum==t)          cout<<sum<<" ";      }  }  int main(void)  {      NaturalNumber nn;   //定义类的一个实例（对象）      nn.setValue (6);      cout<<nn.getValue()<<(nn.isPrime()?"是":"不是")<<"素数" <<endl;        nn.setValue (37);      cout<<nn.getValue()<<(nn.isPrime()?"是":"不是")<<"素数" <<endl;        nn.setValue (84);      cout<<nn.getValue()<<"的因子有:";      nn.printFactor();        nn.setValue(6);      cout<<nn.getValue()<<(nn.isPerfect()?"是":"不是")<<"完全数" <<endl;        nn.setValue(15);      cout<<nn.getValue()<<(nn.isPerfect()?"是":"不是")<<"完全数" <<endl;        nn.setValue(4321);      cout<<"1234"<<(nn.isReverse(1234)?"是":"不是")<<nn.getValue()<<"的逆向数" <<endl;        nn.setValue(4321);      cout<<"1111"<<(nn.isReverse(1111)?"是":"不是")<<nn.getValue()<<"的逆向数" <<endl;        cout<<"153"<<(nn.isDaffodil(153)?"是":"不是")<<"水仙花数" <<endl;      cout<<"244"<<(nn.isDaffodil(244)?"是":"不是")<<"水仙花数" <<endl;        nn.setValue(2048);      cout<<nn.getValue()<<"之内的水仙花数有:";      nn.Daffodils();  }

三、项目名称：Book类

#include <iostream>  #include<string>  using namespace std;  class Book  {  public:      void setBook(string n,string w,string p,float pri,int num,int N);      void borrow();      void restore();      int print();      void set_NO(int x);      int get_NO();  private:      int number,NO,t;      float price;      string name,writer,publicer;  };  void Book::setBook(string n,string w,string p,float pri,int num,int N)  {      name=n;      writer=w;      publicer=p;      price=pri;      number=num;      NO=N;      t=number;  }  int Book::print()  {      cout<<"Name:"<<name<<endl;      cout<<"Writer:"<<writer<<endl;      cout<<"Publicer:"<<publicer<<endl;      cout<<"Price:"<<price<<endl;      cout<<"Number:"<<number<<endl;      cout<<"NO:"<<NO<<endl;  }  void Book::set_NO(int x)  {      NO=x;  }  int Book::get_NO()  {      return NO;  }  void Book::borrow()  {      number=t;      number--;      cout<<"number after borrow:"<<number<<endl;  }  void Book::restore()  {      number=t;      number++;      cout<<"number after restore:"<<number<<endl;  }  int main()  {      Book bo;      bo.setBook("Echo","Echo","Bilibili",233.33,23,23333);      bo.print();      bo.set_NO(23333);      cout<<"NO:"<<bo.get_NO()<<endl;      bo.borrow();      bo.restore();      return 0;  }

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