bato_2.cpp

#include<iostream>

class Csample{
  public:
  Csample(){                   //iniitialization 
    for(int i=0;i<1000;i++){  
      stack[i]=-1;
    }
  }
  void push(int x); //enter
  int get(int cat); //arrey's public            
  int eget(); //element's public            
  int pop(); //back
  
  private:
    int stack[1000];
    int end_index=0;
};

/*enter*/
void Csample::push(int x){
  stack[end_index]=x; //sub + element plus 
  end_index++;      
}

/*arrey's public*/
int Csample::get(int cat){
    return stack[cat];
}
/*element's public*/
int Csample::eget(){           
  return end_index;
}

/*back*/
int Csample::pop(){
  int re=0;                 //return arrey;
   re=stack[end_index - 1]; //plus-1 is display
   stack[end_index -1]=-1;
  end_index--;
  return re;
}
int main(){
  Csample cs1;
  int a;
  char q; //div
  std::cin>>q;    //div sub         
  while(q!='q'){
    switch(q){
      case 'i':       //input
        std::cin>>a; //num sub
        cs1.push(a);
        for(int i=0;i<cs1.eget();i++){
          std::cout<<cs1.get(i)<<",";
        }
        std::cout<<std::endl;
        break;
      case 'o':       //return outpot
        std::cout<<"return:"<<cs1.pop()<<std::endl;
        for(int i=0;i<cs1.eget();i++){
          std::cout<<cs1.get(i)<<",";
        }
        std::cout<<std::endl;
        break;
      
      default:     //i or o other
        std::cout<<"error"<<std::endl;
    }
  std::cin>>q;  //div sub
  }
  return 0;
}