Question

一段dev c++的问题，本人新手

#include<iostream>
using namespace std;
int main()
{ char A;
char M;
char N;
char D;
char P;
char L;
char H;
char G;
char C;

cout<<"输入"<<endl;
cin>>A;

if(A==M)
cout<<"good"<<endl;

else if(A==N)
cout<<"great"<<endl;

else if(A==D)
cout<<"excellent"<<endl;

else if(A==P)
cout<<"ok"<<endl;

else if(A==L)
cout<<"just so so"<<endl;

else if(A==H)
cout<<"low"<<endl;

else if(A==G)
cout<<"XXX"<<endl;

else if(A==C)
cout<<"00000"<<endl;

else cout<<"none"<<endl
system("pause");
return 0;
}

无论我输入什么都显示none，这是为什么，求大神解答

Answer 1

#include<iostream>
    using namespace std;
    int main()
    {  char A;
    /*
       char M;
       char N;
       char D;
       char P;
       char L;
       char H;
       char G;
       char C;
       */

    cout<<"输入"<<endl;
       cin>>A;

       if(A=='M')
          cout<<"good"<<endl;

       else if(A=='N')
          cout<<"great"<<endl;

       else if(A=='D')
          cout<<"excellent"<<endl;

       else if(A=='P')
          cout<<"ok"<<endl;

       else if(A=='L')
          cout<<"just so so"<<endl;

       else if(A=='H')
          cout<<"low"<<endl;

       else if(A=='G')
          cout<<"XXX"<<endl;

       else if(A=='C')
          cout<<"00000"<<endl;

       else cout<<"none"<<endl;
       system("pause");
       return 0;
 }

追问

多谢大神，我已经解决问题了，能问一句为什么要将a底下几行改为注释呢？还有双引号和单引号有什么不同呢？

追答

改成注释是没有用到，双引号是字符串，单引号是字符．至于字符串和字符的区别，那就百度一下．