명품 C++ Programming 실습문제 8장 6번

#include <iostream>
#include <string>
using namespace std;
 
class BaseArray {
private:
    int capacity;
    int *mem;
protected:
    BaseArray(int capacity = 100) {
        this->capacity = capacity; mem = new int[capacity];
    }
    ~BaseArray() { delete[]mem; }
    void put(int index, int val) { mem[index] = val; }
    int get(int index) { return mem[index]; }
    int getCapacity() { return capacity; }
};
 
class MyStack :public BaseArray {
    int index;
public:
    MyStack(int capacity) :BaseArray(capacity) { index = 0; }
    void push(int n) { put(index, n); index++; }
    int pop() { index--; return get(index); }
    int capacity() { return getCapacity(); }
    int length() { return index; }
};
 
int main() {
    MyStack mStack(100);
    int n;
    cout << "스택에 삽입할 5개의 정수를 입력하라>> ";
    for (int i = 0; i < 5; i++) {
        cin >> n;
        mStack.push(n);
    }
    cout << "스택의 용량:" << mStack.capacity() << ", 스택의 크기:" << mStack.length() << '\n';
    cout << "스택의 원소를 순서대로 제거하여 출력한다>> ";
    while (mStack.length() != 0) {
        cout << mStack.pop() << ' ';
    }
    cout << '\n' << "스택의 현재 크기 : " << mStack.length() << '\n';
}