#include <cstring>

class CStack {
private:
    unsigned m_uSize;
    int *m_puSTACK;     // Segment STACK
	unsigned m_uESP;    // STACK POINTER
	unsigned m_uEBP;  // BASE POINTER

public:
	CStack(unsigned size);	// Inicialize Value
	virtual ~CStack();
	void push(int iReg);	// Instruction PUSH Operator
	int pop();              // Instruction POP	Operator
	bool isFull();
    unsigned ESP();
    unsigned ESP(unsigned ESP);

    unsigned EBP();
    unsigned EBP(unsigned EBP);
};

CStack::CStack(unsigned size) : m_uESP(NULL), m_uEBP(0) {
    m_puSTACK = new int[m_uSize = size];
    memset(m_puSTACK, 0, m_uSize * sizeof(int));
}

CStack::~CStack() {
    delete m_puSTACK;
}

unsigned CStack::ESP() {
    return m_uESP;
}

unsigned CStack::ESP(unsigned ESP) {
    return m_uESP = ESP;
}

unsigned CStack::EBP() {
    return m_uEBP;
}

unsigned CStack::EBP(unsigned EBP) {
    if (EBP > m_uSize)
        EBP = m_uSize;
    return m_uEBP = EBP;
}

bool CStack::isFull(){
    return m_uSize == m_uESP ? true:false;
}

void CStack::push(int iReg) {
    if (m_uESP > m_uSize) return;
	m_puSTACK[m_uESP++] = iReg;
}

int CStack::pop(){
    int iRet;
    if (m_uESP == m_uEBP)
        return m_puSTACK[m_uEBP];
    iRet = m_puSTACK[m_uESP - 1];
    m_puSTACK[--m_uESP] = 0;
	return iRet;
}