C++ : Friend Function 3

Friend functions with objects of similar classes

Note: Passing objects to function and function returning an object

Question:1
Class Distance (feet and inches)
C++ program to declare a class named distance with attributes as feet and inches. Take input for two distances calculate and display their sum.
Sol:

Solution In CodeBlocks/DevC++

#include<iostream>
#include<conio.h>
using namespace std;
class distance1
{
private:
     int feet,inches;
public:
     void read();
     void show();
     friend distance1 add(distance1 d1,distance1 d2);
};
void distance1::read()
{
  cout<<"Enter feet and inches ";
  cin>>feet>>inches;
}
void distance1::show()
{
  cout<<"Feet "<<feet<<" Inches "<<inches<<endl;
}
distance1 add(distance1 d1,distance1 d2)
{
  distance1 t;
  t.feet=d1.feet+d2.feet;
  t.inches=d1.inches+d2.inches;
  if(t.inches>=12)
  {
    t.feet=t.feet+t.inches/12;
    t.inches=t.inches%12;
  }
  return(t);
}
int main()
{
  /* clrscr(); */
  distance1 e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
  return(0);
 } 

/* Output */

Enter feet and inches 5 10
Enter feet and inches 6 11
Feet 5 Inches 10
Feet 6 Inches 11
Feet 12 Inches 9

Solution In Turboc3

/* this program is developed in turboc3 */
#include<iostream.h>
#include<conio.h>
class distance
{
private:
	int feet,inches;
public:
	void read();
	void show();
	friend distance add(distance d1,distance d2);
};
void distance::read()
{
  cout<<"Enter feet and inches ";
  cin>>feet>>inches;
}
void distance::show()
{
  cout<<feet<<" "<<inches<<endl;
}
distance add(distance d1,distance d2)
{
  distance t;
  t.feet=d1.feet+d2.feet;
  t.inches=d1.inches+d2.inches;
  if(t.inches>=12)
  {
    t.feet=t.feet+t.inches/12;
    t.inches=t.inches%12;
  }
  return(t);
}
void main()
{
  clrscr();
 distance e1,e2,e3;
 e1.read();e2.read();
 e1.show();e2.show();
 e3=add(e1,e2);
 e3.show();
 getch();
 }

Question:2
Class Distance (km and m)
C++ program to declare a class named distance with attributes as km and m. Take input for two distances calculate and display their sum.
Sol:

#include<iostream>
#include<conio.h>
using namespace std;
class distance1
{
private:
     int km,m;
public:
     void read();
     void show();
     friend distance1 add(distance1 d1,distance1 d2);
};
void distance1::read()
{
  cout<<"Enter km and m ";
  cin>>km>>m;
}
void distance1::show()
{
  cout<<"KM "<<km<<" M "<<m<<endl;
}
distance1 add(distance1 d1,distance1 d2)
{
  distance1 t;
  t.km=d1.km+d2.km;
  t.m=d1.m+d2.m;
  if(t.m>=1000)
  {
    t.km=t.km+t.m/1000;
    t.m=t.m%1000;
  }
  return(t);
}
int main()
{
  /* clrscr(); */
  distance1 e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
  return(0);
 } 

/* Output */

Enter km and m 5 800
Enter km and m 6 700
KM 5 M 800
KM 6 M 700
KM 12 M 500

Question:3
Class Distance (m and cm)
C++ program to declare a class named distance with attributes as m and cm. Take input for two distances calculate and display their sum.
Sol:

#include<iostream>
#include<conio.h>
using namespace std;
class distance1
{
private:
     int m,cm;
public:
     void read();
     void show();
     friend distance1 add(distance1 d1,distance1 d2);
};
void distance1::read()
{
  cout<<"Enter m and cm ";
  cin>>m>>cm;
}
void distance1::show()
{
  cout<<"m "<<m<<" cm "<<cm<<endl;
}
distance1 add(distance1 d1,distance1 d2)
{
  distance1 t;
  t.m=d1.m+d2.m;
  t.cm=d1.cm+d2.cm;
  if(t.cm>=100)
  {
    t.m=t.m+t.cm/100;
    t.cm=t.cm%100;
  }
  return(t);
}
int main()
{
  /* clrscr(); */
  distance1 e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
  return(0);
 } 

/* Output */

Enter m and cm 5 20
Enter m and cm 6 90
m 5 cm 20
m 6 cm 90
m 12 cm 10