cpp 10.10

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stack.h

#pragma oncetypedef unsigned long Item;class Stack{private:enum { MAX = 10 };Item items[MAX];int top;public:Stack();bool isempty() const;bool isfull() const;bool push(const Item & item);bool pop(Item & item);};

stack.cpp

#include "stack.h"Stack::Stack(){top = 0;}bool Stack::isempty() const{return top == 0;}bool Stack::isfull() const{return top == MAX;}bool Stack::push(const Item & item){if (top < MAX){items[top++] = item;return true;}elsereturn false;}bool Stack::pop(Item & item){if (top > 0){item = items[--top];return true;}elsereturn false;}

stacker.cpp

#include<iostream>#include<cctype>#include"stack.h"int main(){using namespace std;Stack st;char ch;unsigned long po;cout << "Please enter A to add purchase order,\n"<< "P to process a PO, or Q to quit.\n";while (cin >> ch && toupper(ch) != 'Q'){while (cin.get() != '\n')continue;if (!isalpha(ch)){cout << '\a';continue;}switch (ch){    case 'A':    case 'a': cout << "Enter a PO number to add: ";          cin >> po;          if (st.isfull())          cout << "stack already full\n";          else          st.push(po);          break;case 'p':case 'P': if (st.isempty())      cout << "stack already empty\n";  else {  st.pop(po);  cout << "PO #" << po << " popped\n";  }  break;}cout << "Please enter A to add a purchase order,\n"<< "P to process a PO, or Q to quit.\n";}cout << "Bye\n";system("pause");return 0;}

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