Why can't I have a variable in switch-case statement? [duplicate]

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南旧 2021-02-19 11:50

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感情败类 (楼主)

2021-02-19 12:19

//here is the full functional code snippet which can be compiled and run with most of C++  
//compiler/link ...console app was demoed but you can apply the code/logic to win32 app...
//if you have any problem, send me email to Samuel_Ni@yahoo.com

#include 
#include 
#include 

class CkbdHanler{
  private:
    map > moves;
  protected:
    char up_key;
    char down_key;
    char right_key;
    char left_key;
  public:

CkbdHanler(char a,char b,char c,char d):up_key(a),
                                        down_key(b),
                                       right_key(c),
                                       left_key(d)
{
    moves[up_key] = make_pair(0, -1);
    moves[down_key] = make_pair(0, 1);
    moves[left_key] = make_pair(-1, 0);
    moves[right_key] = make_pair(1, 0);
 }

bool keyPress(char c){
    if (moves.count(c)) {
            pair dir = moves[c];
            move(dir.first, dir.second);
            return true;
   } else return false;

}
void move(int i,int j){
   cout<<"(i,j)=("<