实验1

#include <iostream>
using namespace std;
int main()
{char a;
 cout<<"Menu:A(add) D(elete) S(ort) Q(uit)"<<endl;
 cin>>a;
 while(a!='Q')
{ if(a=='A')
   { cout<<"数据已经增加"<<endl;}
  else if(a='D')
   { cout<<"数据已经删除"<<endl;}
  else if(a='S')
    {cout<<"数据已经排序"<<endl;}
   cin>>a;}
   return 0; 
}

#include <iostream>
using namespace std;
int main()
{ char a;
  cout<<"Menu:A(dd) D(elete) S(ort) Q(uit),select one:"<<endl;
  cin>>a;
  while(a!='Q')
  {switch(a)
    {
     case'A':{cout<<"数据已经增加"<<endl;break;}
     case'D':{cout<<"数据已经删除"<<endl;break;}
     case'S':{cout<<"数据已经排序"<<endl;break;}
    }
  cin>>a;
  }
  return 0;
 } 

#include <iostream>
using namespace std;
int main()
{int n,m,i,j;
 n=2;
 while(n<=100)
 {j=1;i=n/2;m=2;
  while(m<=i)
  {if(n%m==0)
   {j=0;break;}
   m++;
  }
  if(j)
  {
  cout<<n<<" ";}
  n++;
 }
}

#include <iostream>
using namespace std;
int main()
{int n,m,i,j;
 n=2;
  do
 {j=1;i=n/2;m=2;
  while(m<=i)
  {if(n%m==0)
   {j=0;break;}
   m++;
  }
  if(j)
  {
  cout<<n<<" ";}
  n++;
 }
  while(n<=100);
}

#include <iostream>
using namespace std;
int main()
{int n,m,i,j;
 n=2;
 for(;n<=100;n++)
 {j=1;i=n/2;m=2;
  for(;m<=i;m++)
  {if(n%m==0)
   {j=0;break;}
   m++;
  }
  if(j)
  {
  cout<<n<<" ";}
 }
}

#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
int main()
{int m,n;
 cout<<"输入1~100以内的数："<<endl; 
 srand((unsigned)time(0));
 m=rand()%(100)+1;
  cin>>n;
  while(m!=n)
  {if(m<n)
   cout<<"The number is bigger."<<endl;
   if(m>n)
   cout<<"The number is lower."<<endl;
   cin>>n; 
  }
  cout<<"You are right."<<endl;
  } 

#include <ctime>
#include <cstdlib>
using namespace std;
int main()
{int m,n;
 cout<<"输入1~100以内的数："<<endl; 
 srand((unsigned)time(0));
 m=rand()%(100)+1;
  cin>>n;
  do
  {if(m<n)
   cout<<"The number is bigger."<<endl;
   if(m>n)
   cout<<"The number is lower."<<endl;
   cin>>n; 
  }
  while(m!=n);
  cout<<"You are right."<<endl;
  } 

#include <iostream>
using namespace std;
int main()
{int i,j,k,n=0;
 for(i=1;i<=5;i++)
 {for(j=i+1;j<=5;j++)
  {for(k=j+1;k<=5;k++)
  cout<<i<<j<<k<<endl; 
  }
 }
 }