tugas alprog minggu ke 9

1)      mencari persaan garis

#include <iostream.h>

#include <conio.h>

class persgaris {

        friend ostream& operator<<(ostream&, persgaris&);

        friend istream& operator>>(istream&, persgaris&);

public:

  persgaris();

  float gradien();

  float konstanta();

private:

  float x1, y1, x2, y2;

};

persgaris::persgaris(){

        cout<<"program persamaan garis dengan 2 titik \n";

}

ostream& operator<<(ostream& out, persgaris& j){

  out << "gradien = "<<j.gradien()<<endl;

  out << "y = "<<j.gradien()<<"x + "<<j.konstanta()<<endl;

  return out;

}

istream& operator>>(istream& in, persgaris& j){

  cout << "x1 : "; in >> j.x1;

  cout << "y1 : "; in >> j.y1;

  cout << "x2 : "; in >> j.x2;

  cout << "y2 : "; in >> j.y2;

  return in;

}

float persgaris::gradien(){

   return ((y2-y1)/(x2-x1));

}

float persgaris::konstanta(){

   return (y1-(x1*gradien()));

}

void main(){

  persgaris j;

  cin >> j;

  cout << j;

  getch();

}