猜数字游戏

刚学C++，自己编了程序，还能运行，希望高手看看有梅有可以改进的地方！！！
#include <iostream.h>
void main()
{
    char ch,c='n';
    
    
    while(1)
    {
        cout<<"-----press\'y\'to close this exe\n";
        cin>>ch;
        if(c=='y') break;
        else
        {
                cout<<"请输入一个数字：0-9\n";
        cin>>ch;    
        switch(ch)
    {
        case '0': cout<<"Sorry,you have nothing."<<endl; break;
        case '9':  cout<<"You have a long life."<<endl; break;
        case '8':  cout<<"Lucky number."<<endl; break;
        case '7':  cout<<"Sunday will make you happy."<<endl; break;
        case '6':  cout<<"Sing a song,Please."<<endl; break;
        case '5':  cout<<"Happy girl."<<endl; break;
        case '4':  cout<<"Nothing."<<endl; break;
        case '3':  cout<<"Good luck."<<endl; break;
        case '2':  cout<<"You are my best friend."<<endl; break;
        case '1':  cout<<"You are number one."<<endl; break;
        default:  cout<<"The character is not between 0 and 9."<<endl;
    }
        
    }
    }
  
}