第六章

 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     else
24     {
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 }