求教带SWITCH的编程题

[zzzwilliam]

请输入星期几的第一个字母来判断一下是星期几，如果第一个字母一样，则继续判断第二个字母。

#include "iostream"
using namespace std;

int main()
{
	char letter;
	cin >>letter;
	while(letter != 'y'){	
	switch(letter){
		case 'M':cout<<"Monday"<<endl;break;
		case 'T':cout <<"Enter second letter :";
			if(letter == 'u')
				cout<<"Tuesday"<<endl;
			else if (letter == 'h')
				cout<<"Thursday"<<endl;
			else cout<<"data error"<<endl;break;
                case 'W':cout<<"Wednesday"<<endl;break;
		case 'F':cout<<"Friday"<<endl;break;
		case 'S':cout <<"Enter second letter :";
			if(letter == 'a')
				cout<<"Saturday"<<endl;
			else if(letter == 'u')
				cout<<"Sunday"<<endl;
			else cout<<"data error"<<endl;break;
		default:cout<<"data error"<<endl;
	}
	}
			system("PAUSE");
	return 0;
}

怎样才能继续输入第二个字符,并执行IF语句的判断,源题是C语言程序编写,我用C++写的.还有什么更简便的写法么?
貌似我这个写法有很多错误,希望能帮我指出,帮我改正.我是新手,谢谢大家!

[jiangheng2008]

#include <iostream> 
using namespace std; 

int main() 
{ 
	char letter;
	do
	{    
		cout << "Choose a letter,M,T,W,F,S. Input Y to end!"<<endl;
		cin >> letter;
		switch(letter)
		{
		case 'M':
			cout<<"Monday"<<endl;
			break;
		case 'T':
			cout <<"Enter second letter :";
			cin >> letter;
			if(letter == 'u')
				cout<<"Tuesday"<<endl;
			else if (letter == 'h')
				cout<<"Thursday"<<endl;
			else 
				cout<<"data error"<<endl;
			break;
		case 'W':
			cout<<"Wednesday"<<endl;
			break;
		case 'F':
			cout<<"Friday"<<endl;
			break;
		case 'S':
			cout <<"Enter second letter :";
			cin >> letter;
			if(letter == 'a')
				cout<<"Saturday"<<endl;
			else if(letter == 'u')
				cout<<"Sunday"<<endl;
			else cout<<"data error"<<endl;
			break;
		default:
			cout<<"data error"<<endl;
		}
	}while(letter != 'Y');
		//system("PAUSE");
		return 0;
}

[feng4206yu]

#include <iostream>
using namespace std;

int main()
{
    char letter;
    cin >>letter;
    while(letter != 'y'){    
    switch(letter){
        case 'M':cout<<"Monday"<<endl;break;
        case 'T':cout <<"Enter second letter :";
			cin>>letter;
            if(letter == 'u')
                cout<<"Tuesday"<<endl;
            else if (letter == 'h')
                cout<<"Thursday"<<endl;
            else cout<<"data error"<<endl;break;
        case 'W':cout<<"Wednesday"<<endl;break;
        case 'F':cout<<"Friday"<<endl;break;
        case 'S':cout <<"Enter second letter :";
			cin>>letter;
            if(letter == 'a')
                cout<<"Saturday"<<endl;
            else if(letter == 'u')
                cout<<"Sunday"<<endl;
            else cout<<"data error"<<endl;break;
        default:cout<<"data error"<<endl;
    }
	cout<<"again?Enter 'y' to quit..."<<endl;
	cin>>letter;
    }
    //system("PAUSE");
    return 0;
}

自己注意大小写...

[zzzwilliam]

多谢大侠...

[nullah]

#include "iostream"
using namespace std;

int main()
{
	char letter;
	//cin >> letter;
	while(cin>>letter,letter != 'y'){  //////修改了这  
		switch(letter){
		case 'M':
			cout<<"Monday"<<endl;
			break;
		case 'T':
			cout <<"Enter second letter :";
			cin >> letter;///////////////////修改了这
			if(letter == 'u')
				cout<<"Tuesday"<<endl;
			else if (letter == 'h')
				cout<<"Thursday"<<endl;
			else 
				cout<<"data error"<<endl;
			break;
		case 'W':
			cout<<"Wednesday"<<endl;break;
		case 'F':
			cout<<"Friday"<<endl;break;
		case 'S':
			cout <<"Enter second letter :";
			cin >> letter;///////////////////////修改了这
			if(letter == 'a')
				cout<<"Saturday"<<endl;
			else if(letter == 'u')
				cout<<"Sunday"<<endl;
			else 
				cout<<"data error"<<endl;break;
		default:
			cout<<"data error"<<endl;
		}
	}
	system("PAUSE");
	return 0;
}