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  1. #include <iostream>
  2. #include <map>
  3. #include <string>
  4. #include <sstream>
  5. using namespace std;
  6. class ICommand{
  7. public:
  8.     virtual void execute(istream &args) = 0;  
  9. };
  10.  
  11. class Add : public ICommand{
  12.     void execute(istream &args){
  13.         int a,b;
  14.         args >> a;
  15.         args >> b;
  16.         cout << "Add result:" <<  a + b << endl;
  17.     }
  18. };
  19.  
  20. class Negate : public ICommand{
  21.     void execute(istream &args){
  22.         int a;
  23.         args >> a;
  24.         cout <<"Negate result:"<< -a << endl;
  25.     }
  26. };
  27.  
  28. int main(){
  29.     map<string,ICommand*> commands;
  30.  
  31.     commands["Add"] = new Add();
  32.     commands["Negate"] = new Negate();
  33.     string cmd;
  34.     while(cin >> cmd){
  35.         auto it = commands.find(cmd);
  36.         if(it!= commands.end()){
  37.             it->second->execute(cin);
  38.         }else{
  39.             cout << "Unknown command \"" << cmd << "\"." << endl;
  40.         }
  41.     }
  42. }
Success #stdin #stdout 0s 3480KB
comments (?)
stdin
copy 
Add 1 2
Negate 4
stdout
copy 
Add result:3
Negate result:-4
https://ideone.com/YgMUbj
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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