Chapter 7,Problem 3:Object Oriented Programming by Robert Lafore in C++ Solution Manual

//Ahmad Furqan Attari
// P7.3
// averages an array of Distance objects input by user
#include <iostream>
#include <conio.h>
using namespace std;
////////////////////////////////////////////////////////////////
class Distance // English Distance class
{
private:
 int feet;
 float inches;
public:
 Distance() //constructor (no args)
 {
  feet = 0; inches = 0;
 }
 Distance(int ft, float in) //constructor (two args)
 {
  feet = ft; inches = in;
 }
 void getdist() //get length from user
 {
  cout << "\nEnter feet : "; cin >> feet;
  cout << "Enter inches : "; cin >> inches;
 }
 void showdist() //display distance
 {
  cout << feet << "\' - " << inches << '\"';
 }
 void add_dist(Distance d2, Distance d3)
 {
  inches = d2.inches + d3.inches; //add the inches
  feet = 0; //(for possible carry)
  if (inches >= 12.0) //if total exceeds 12.0,
  { //then decrease inches
   inches -= 12.0; //by 12.0 and
   feet++; //increase feet
  } //by 1
  feet += d2.feet + d3.feet; //add the feet
 }
 void div_dist(Distance d2, int divisor)
 {
  float fltfeet = d2.feet + d2.inches / 12.0; //convert to float
  fltfeet /= divisor; //do division
  feet = int(fltfeet); //get feet part
  inches = (fltfeet - feet) * 12.0; //get inches part
 }
};
void main(void)
{
 Distance distarr[100]; //array of 100 Distances
 Distance total(0, 0.0), average; //other Distances
 int count = 0; //counts Distances input
 char ch; //user response character
 do {
  cout << "\nEnter a Distance"; //get Distances
  distarr[count++].getdist(); //from user, put
  cout << "\nDo another(y / n) ? "; //in array
  cin >> ch;
 } while (ch != 'n');
 for (int j = 0; j<count; j++) //add all Distances
  total.add_dist(total, distarr[j]); //to total
 average.div_dist(total, count); //divide by number
 cout << "\nThe average is : "; //display average
 average.showdist();
 cout << endl;
 _getch();
}