1 #include<iostream> 2 using namespace std; 3 int main() 4 { 5     char ch; 6     int spaces=0,total=0; 7     cin.get(ch); 8     while(ch !=‘.‘)//注意使用单引号。 9     {10         if(ch ==‘ ‘)spaces++;11         total++;12         cin.get(ch);13     }14     cout<<spaces<<" sapces, "<<total<<" characters total in sentence"<<endl;15     return 0;16 }

 1 #include<iostream> 2 using namespace std; 3 const int size=6; 4 int main() 5 { 6     float a[size]; 7     cout<<"enter value,when you make "<<size<<" enteries or enter a negetive"<<endl; 8     int i=0; 9     float temp;10     cout<<"frist value";11     cin>>temp;12     while(i<size&&temp>=0)13     {14         a[i]=temp;15         i++;16         if(i<size)17         {18             cout<<"next value:";19             cin>>temp;20         }21     }22     if(i==0)cout<<"no data"<<endl;23     else24     {25         cout<<"enter your naaq";26         float you;27         cin>>you;28         int count=0;29         for(int j=0;j<i;j++)if(a[j]>you)count++;30         cout<<count;31         cout<<" of your neighbors have greater awarense of the new age then you do";32     }33     return 0;34 }

1 switch（interger-expression）2 {3     case label1:statement(a);4     case label2:statement(b);5     …6     case labeln:statement(n);7 default:statement(s);8 }

 1 #include<iostream> 2 using namespace std; 3 void showmenu(); 4 void report(); 5 void comfort(); 6 int main() 7 { 8     char choice; 9     cin>>choice;10     while(choice!=‘q‘&&choice!=‘Q‘)11     {12         switch(choice)13         {14         case ‘a‘:15         case ‘A‘:cout<<"a and A";16                 break;17         case‘b‘:18         case‘B‘:cout<<"b and B";19                 break;20         case‘c‘:21         case‘C‘:cout<<"c and C";22                 break;23         case‘d‘:24         case‘D‘:cout<<"d and D";25                 break;26         default:cout<<"that is not a choice"<<endl;27         }28         cin>>choice;29     }30     return 0;31 }