实验一

2-28-（1）
#include<iostream>
using namespace std;
int main()
{
    char n;
    cout<<"Menu:A(dd) D(elect) S(ort) Q(uit),select one:";
    cin>>n;
    while (n!='Q')
    {
        if (n=='A')
          cout<<"The data has been added"<<endl;
        else if(n=='D')
          cout<<"The data has been delected"<<endl;
        else if(n=='S')
          cout<<"The data has been sorted"<<endl;
        else 
          cout<<"The data is wrong,please input again:"<<endl;
        cin>>n;
    }
    return 0;
 } 

 

 

2-28-(2)

#include<iostream>
using namespace std;
int main()
{
    char n;
    cout<<"Menu:A(dd) D(elect) S(ort) Q(uit),select one:";
    cin>>n;
    while (n!='Q')
    {
    switch(n)
    {
        case'A':
          cout<<"The data has been added"<<endl;break;
        case'D':
          cout<<"The data has been delected"<<endl;break;
        case'S':
          cout<<"The data has been sorted"<<endl;break;
        default:
          cout<<"The data is wrong,please input again:"<<endl;break;
    }
    cin>>n;        
    }
    return 0;
 } 

 

2-29-while

#include<iostream>
#include<cmath>
using namespace std;
int main ()
{
 int i=2,j,k;
 while(i<=100)
 {
     k=sqrt(i);
     for (j=2;j<=k;j++)
       if (i%j==0)
           break;
     if (j>k)
       cout<<i<<endl;
     i++;
    }
return 0;    
 } 

 

 

2-29-do...while
#include<iostream>
#include<cmath>
using namespace std;
int main ()
{
 int i=2,j,k;
 do
 {
     k=sqrt(i);
     for (j=2;j<=k;j++)
       if (i%j==0)
           break;
     if (j>k)
       cout<<i<<endl;
     i++;
    }while(i<=100);
return 0;    
 } 

 

 

2-29-for

#include<iostream>
#include<cmath>
using namespace std;
int main ()
{
 int i,j,k;
 for (i=2;i<=100;i++)
 {
     k=sqrt(i);
     for (j=2;j<=k;j++)
       if (i%j==0)
           break;
     if (j>k)
       cout<<i<<endl;
    }
return 0;    
 } 

 

 

2-32-while

#include <iostream>
#include <cstdlib>
using namespace std;
int main ()
{
    int n;
    unsigned seed;
    cout<<"Please input the seed:";
    cin>>seed;
    srand (seed);
    n=rand()%100;
    int a;
    cout<<"Please guess the number:"<<endl;
    cin>>a;
    while (a>=0&&a<=100)
    {
        if (a>n)
        {
        cout<<"Bigger than the number,please guess again:"<<endl;
        cin>>a;    
        }
    
        else if (a<n)
        {
        cout<<"lower than the number,please guess again:"<<endl;
        cin>>a;    
        }
        else 
        {
        cout<<"Great!you guess the number"<<endl;
        break;    
        }
        
    }
return 0;    
}

2-32-do...while

#include <iostream>
#include <cstdlib>
using namespace std;
int main ()
{
    int n;
    unsigned seed;
    cout<<"Please input the seed:";
    cin>>seed;
    srand (seed);
    n=rand()%100;
    int a;
    cout<<"Please guess the number:"<<endl;
    cin>>a;
    do
    {
        if (a>n)
        {
        cout<<"Bigger than the number,please guess again:"<<endl;
        cin>>a;    
        }
    
        else if (a<n)
        {
        cout<<"lower than the number,please guess again:"<<endl;
        cin>>a;    
        }
        else 
        {
        cout<<"Great!you guess the number"<<endl;
        break;    
        }
        
    }while (a>=0&&a<=100);
return 0;    
}

 

 

 

3-34

#include <iostream>
#include<iomanip>
using namespace std;
enum Color{red,yellow,blue,white,black};
void colorput(int a)
{
    Color color;
    color=Color(a);
    switch (a)
    {
        case 0:cout<<setprecision(8)<<"red ";break;
        case 1:cout<<setprecision(8)<<"yellow ";break;
        case 2:cout<<setprecision(8)<<"blue ";break;
        case 3:cout<<setprecision(8)<<"white ";break;
        case 4:cout<<setprecision(8)<<"black ";break;
        
    }
 } 
int main ()
{
   int count=0;    
   int i,j,k;
   for (i=0;i<=4;i++)
      for (j=0;j<=4;j++)
         for (k=0;k<=4;k++)
         {
         if (i!=j&&i!=k&&j!=k)
              {
                  count++;
                  colorput(i);
                  colorput(j);
                  colorput(k);
                cout<<endl;
              }    
         }
         
   cout<<count<<endl;
   return 0;
   
}