经典算法（31~60）

 1 #include<iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     char c;
 6     cin>>c;
 7     switch(c)
 8     {
 9     case ‘M‘:
10         cout<<"Monday"<<endl;
11         break;
12     case ‘T‘:
13         cout<<"input another letter: ";
14         cin>>c;
15         if(c==‘u‘)        cout<<"Tuesday"<<endl;
16         else if(c==‘h‘)        cout<<"Thursday"<<endl;
17         break;
18     case ‘W‘:
19         cout<<"Wendesday"<<endl;
20         break;
21     case ‘F‘:
22         cout<<"Friday"<<endl;
23         break;
24     case ‘S‘:
25         cout<<"input another letter: ";
26         cin>>c;
27         if( c==‘a‘)        cout<<"Saturday"<<endl;
28         else if( c==‘u‘)        cout<<"Sunday"<<endl;
29         break;
30     default:
31         cout<<"input error"<<endl;
32         break;
33     }
34     system("pause");
35     return 0;
36 }

 1 #include<iostream>
 2 #include "windows.h"
 3 using namespace std;
 4 int textbackground(short iColor)
 5 {
 6     HANDLE hd = GetStdHandle(STD_OUTPUT_HANDLE);
 7     CONSOLE_SCREEN_BUFFER_INFO csbInfo;
 8     GetConsoleScreenBufferInfo(hd, &csbInfo);
 9     return SetConsoleTextAttribute(hd, (iColor<<4)|(csbInfo.wAttributes&~0xF0));
10 }
11 int main()
12 {
13     int color;
14     char c;
15     for( color=0; color<8; color++)
16     {
17         textbackground(color);
18         cout<<"This is color "<<color<<endl;
19         cout<<"Please press any key to continue."<<endl;
20         cin>>c;
21     }
22     system("pause");
23     return 0;
24 }

 1 #include<iostream>
 2 using namespace std;
 3 void hello_world();
 4 void triple_hello_world();
 5 int main()
 6 {
 7     triple_hello_world();
 8     system("pause");
 9     return 0;
10 }
11 void hello_world()
12 {
13     cout<<"Hello World!"<<endl;
14 }
15 void triple_hello_world()
16 {
17     for(int i=0; i<3; i++)
18         hello_world();
19 }