C++ 实验一

2-28-1  用if...else语句实现简单程序

#include <iostream>
using namespace std;
int main () {
char n;
cout<<"Menu: A(dd) D(elete) S(ort) Q(uit),Select one:";
cin>>n;
while(n){
  if(n=='A') 
     cout<<"Date add"<<endl;
  else if(n=='D')
      cout<<"Date delete"<<endl;
  else if(n=='S')
      cout<<"Date sort"<<endl;
  else if(n=='Q')     
      break;
cout<<"Menu: A(dd) D(elete) S(ort) Q(uit),Select one:";
cin>>n;
}
return 0;    
}

 

2-28-2  用switch语句实现简单程序

#include <iostream>
using namespace std;
int main () {
char n;
cout<<"Menu: A(dd) D(elete) S(ort) Q(uit),Select one:";
cin>>n;
while(n){
switch(n){
  case 'A': cout<<"Date add"<<endl;break;
  case 'D': cout<<"Date delete"<<endl;break;
  case 'S': cout<<"Date sort"<<endl;break;
}
cout<<"Menu: A(dd) D(elete) S(ort) Q(uit),Select one:";
cin>>n;
if(n=='Q')  break;
}
return 0;    
}

 

 

2-29-1 用while语句找出1~100间的质数

#include<iostream>
#include<iomanip>
using namespace std;
int main()
 { int i=2,j,k,n=0;
   while (i<100)
   {  k=1;
      j=2;
      while (j<=i-1)
      { if(i%j++==0)
        { k=0;break;}
      }
      if(k==1)
      { n++;
        cout<<setw(5)<<i;
        if(n%5==0)
          cout<<endl;
      }
      i++;
   }
 return 0;
}

 

2-29-2  用do....while语句找出1~100间的质数

#include<iostream>
#include<iomanip>
using namespace std;
int main()
 { int i=2,j,k,n=0;
   do
   {  k=1;
      j=2;
      do
      { if(i%j++==0)
        { k=0;break;}
      } while (j<=i-1);
      if(j>i-1)
      { n++;
        cout<<setw(5)<<i;
        if(n%5==0)
          cout<<endl;
      }
      i++;
   }while (i<100);
 return 0;
}

 

2-29-3  用for语句找出1~100间的质数

#include<iostream>
#include<iomanip>
using namespace std;
int main()
 { int i=2,j,k,n=0;
   for(;i<=100;i++)
   {  k=1;
      for  (j=2;j<=i-1;j++)
      { if(i%j==0)
        { k=0;break;}
      } 
      if(j>i-1)
      { n++;
        cout<<setw(5)<<i;
        if(n%5==0)
          cout<<endl;
      }
   }
 return 0;
}

 

 

2-32-1  用while语句猜数

#include<iostream>
using namespace std;
int main()
{ int a=88,b;
  cin>>b;
  while(b!=a)
  {if (b>a)
    {cout<<"bigger than this number: ";cin>>b;}
   if (b<a)
    {cout<<"smaller than this number: ";cin>>b;}
  }  
  cout<<"Congratulations!You are right!"<<endl;
  return 0;
}

 

2-32-2  用do.....while语句猜数

#include<iostream>
using namespace std;
int main()
{ int a=88,b;
  cin>>b;
  do
  {if (b>a)
    {cout<<"bigger than this number: ";cin>>b;}
   if (b<a)
    {cout<<"smaller than this number: ";cin>>b;}
  }  while(b!=a);
  cout<<"Congratulations!You are right!"<<endl;
  return 0;
}

 

2-34 球的取法

#include <iostream>
using namespace std;
int main()
{ int i,j,k;
  for(i=0;i<=4;i++)
    {for(j=i+1;j<=4;j++)
       {for(k=j+1;k<=4;k++)
          {cout<<i<<"   "<<j<<"   "<<k<<"   "<<endl;}
       } 
     }
  return 0;
}

 

实验总结

1.对于C++还是不太熟悉，在编程过程中还是困难的，有待提高。

2.以上程序有不足处请大家多包涵，多指教。

 

评论的第一位同学：https://www.cnblogs.com/KOKODA/p/10512049.html

评论的第二位同学：https://www.cnblogs.com/msag/p/10556200.html#4212110

评论的第三位同学：https://www.cnblogs.com/21savage-code/p/10515962.html