cpp compile steps

//base.h
#ifndef __BASE_H__
#define __BASE_H__
#include <iostream>
using std::cout;
using std::endl;

class basePoint {
public:
    void setPoint(int, int);
    void display();
private:
    int x;
    int y;
};

#endif

//base.cpp
#ifndef __BASE_CPP__
#define __BASE_CPP__
#include "base.h"

void basePoint::setPoint(int x, int y) {
    this->x = x;
    this->y = y;
}

void basePoint::display() {
    std::cout << x << " " << y << std::endl;
}

#endif

//main.cpp

#include "base.h"

int main(int argc, char* argv[]) {

    basePoint bp0;

    basePoint *bp1 = new basePoint();

    bp0.setPoint(1, 2);

    bp1->setPoint(3, 4);

    bp0.display();

    bp1->display();

    return 0;

}

compile steps:
$ g++ -c base.cpp -o base.o
$ ar cr libbase.a base.o
$ g++ -c -I. main.cpp
$ g++ -o main main.o -L. -lbase