c++

#include<iostream>using namespace std;class CharRange{   public:  void  setchar();  voidpanduan();char a;};void CharRange::setchar(){    cout<<"please input a char"<<endl;     cin>>a;}void CharRange::panduan(){    if(!('A'<=a&&a<='D'))    cout<<"error"<<endl;else cout<<"A<="<<a<<"<=D"<<endl;}int main(){  CharRange t;   t.setchar();   t.panduan();   return 0;}