#include <iostream>
using namespace std;

// declaration
class vector {
    private:
        float x,y,z;

    public:
        vector(float a=0, float b=0, float c=0) {
            x=a;
            y=b;
            z=c;
        }// vector()
        ~vector() {} // nothing to do :)
        void prtVec();
};// class vector

// definitions
void vector::prtVec() {
    cout << x << ", " << y << ", " << z << endl;
}// prtVec()



int main()
{
    vector v; // constructed with 0,0,0
    v.prtVec();

    vector v2(1,2,3);
    v2.prtVec();

    return 0;
}// main()