Praktikum 7

//#include <cstdlib>
#include <iostream>
#define maks 5
using namespace std;
class Stack{
      friend ostream& operator<<(ostream&, const Stack&);

public:
       Stack();
       int penuh(int);
       int kosong(int);
       void cetak();
       void push(char);
       char pop();
private:
        char A[maks];
        int banyak;
};

ostream& operator<<(ostream& out, const Stack& s)
{
         cout << "\n\nIsi stack : ";
         for (int i=0;i< s.banyak;i++)
         out << s.A[i] << " ";
}

Stack::Stack(){
               banyak = 0;
               for (int i=0; i<maks; i++)
               A[i] = '0';
}

int Stack::penuh(int s)
{
    return s == maks ? 1 : 0;
}

int Stack::kosong(int s)
{
    return s == 0 ? 1 : 0;
}

void Stack::cetak()
{
     cout << "\nIsi stack :";
     for (int i=0;i< banyak;i++)
     cout << A[i] << " ";
}

void Stack::push(char x)
{
     cout << "\nElemen masuk :" << x;
     if (penuh(banyak)) cout << "Stack penuh";
     else if (A[0]=='0'){
          A[0] = x;
          banyak++; }
     else {
          for (int i=banyak; i>=0; i--)
          A[i+1] = A[i];
          A[0] = x;
          banyak++; }
}

char Stack::pop()
{
     cout <<"\nPop stack, elemen yang di-pop :" << A[0];
     char temp=A[0];
     for (int i=0;i<banyak; i++) A[i] = A[i+1];
     A[banyak]= '0';
     banyak--;
     return temp;
}

int main(int argc, char *argv[])
{
    Stack stack;
    for (char c='a'; c<'d'; c++){
        stack.push(c);
        stack.cetak();
    }
    char p = stack.pop();
    stack.cetak();
    cout << "\n\nCetak pakai overloading : " << stack;
    system("PAUSE");
    return EXIT_SUCCESS;
}