A general console application programs Day-5

Day5- Console application Programs




listing 1
// A program that uses the Building class.

using System;

class Building {
  public int floors;    // number of floors
  public int area;      // total square footage of building
  public int occupants; // number of occupants
}
 
// This class declares an object of type Building.
class BuildingDemo {
  public static void Main() {
    Building house = new Building(); // create a Building object
    int areaPP; // area per person
 
    // assign values to fields in house
    house.occupants = 4;
    house.area = 2500;
    house.floors = 2;
 
    // compute the area per person
    areaPP = house.area / house.occupants;
 
    Console.WriteLine("house has:\n  " +
                      house.floors + " floors\n  " +
                      house.occupants + " occupants\n  " +
                      house.area + " total area\n  " +
                      areaPP + " area per person");
  }
}

listing 2
// This program creates two Building objects.


using System;

class Building {
  public int floors;    // number of floors
  public int area;      // total square footage of building
  public int occupants; // number of occupants
}
 
// This class declares two objects of type Building.
class BuildingDemo {
  public static void Main() {
    Building house = new Building();
    Building office = new Building();

    int areaPP; // area per person
 
    // assign values to fields in house
    house.occupants = 4;
    house.area = 2500;
    house.floors = 2;

    // assign values to fields in office
    office.occupants = 25;
    office.area = 4200;
    office.floors = 3;
 
    // compute the area per person in house
    areaPP = house.area / house.occupants;
 
    Console.WriteLine("house has:\n  " +
                      house.floors + " floors\n  " +
                      house.occupants + " occupants\n  " +
                      house.area + " total area\n  " +
                      areaPP + " area per person");

    Console.WriteLine();

    // compute the area per person in office
    areaPP = office.area / office.occupants;

    Console.WriteLine("office has:\n  " +
                      office.floors + " floors\n  " +
                      office.occupants + " occupants\n  " +
                      office.area + " total area\n  " +
                      areaPP + " area per person");
  }
}


listing 3
// Add a method to Building.

using System;

class Building {
  public int floors;    // number of floors
  public int area;      // total square footage of building
  public int occupants; // number of occupants

  // Display the area per person.
  public void areaPerPerson() {
    Console.WriteLine("  " + area / occupants +
                      " area per person");
  }
}

// Use the areaPerPerson() method.
class BuildingDemo {
  public static void Main() {
    Building house = new Building();
    Building office = new Building();


    // assign values to fields in house
    house.occupants = 4;
    house.area = 2500;
    house.floors = 2;

    // assign values to fields in office
    office.occupants = 25;
    office.area = 4200;
    office.floors = 3;
 

    Console.WriteLine("house has:\n  " +
                      house.floors + " floors\n  " +
                      house.occupants + " occupants\n  " +
                      house.area + " total area");
    house.areaPerPerson();

    Console.WriteLine();

    Console.WriteLine("office has:\n  " +
                      office.floors + " floors\n  " +
                      office.occupants + " occupants\n  " +
                      office.area + " total area");
    office.areaPerPerson();
  }
}

listing 4
public void myMeth() {
  int i;

  for(i=0; i<10; i++) {
    if(i == 5) return; // stop at 5
    Console.WriteLine();
  }
}

listing 5
// Return a value from areaPerPerson().

using System;

class Building {
  public int floors;    // number of floors
  public int area;      // total square footage of building
  public int occupants; // number of occupants

  // Display the area per person.
  public int areaPerPerson() {
    return area / occupants;
  }
}
 
// Use the return value from areaPerPerson().
class BuildingDemo {
  public static void Main() {
    Building house = new Building();
    Building office = new Building();
    int areaPP; // area per person

    // assign values to fields in house
    house.occupants = 4;
    house.area = 2500;
    house.floors = 2;

    // assign values to fields in office
    office.occupants = 25;
    office.area = 4200;
    office.floors = 3;
 
    // obtain area per person for house
    areaPP = house.areaPerPerson();

    Console.WriteLine("house has:\n  " +
                      house.floors + " floors\n  " +
                      house.occupants + " occupants\n  " +
                      house.area + " total area\n  " +
                      areaPP + " area per person");


    Console.WriteLine();

    // obtain area per person for office
    areaPP = office.areaPerPerson();

    Console.WriteLine("office has:\n  " +
                      office.floors + " floors\n  " +
                      office.occupants + " occupants\n  " +
                      office.area + " total area\n  " +
                      areaPP + " area per person");
  }
}

listing 6
// A simple example that uses a parameter.

using System;

class ChkNum {
  // Return true if x is prime.
  public bool isPrime(int x) {
    for(int i=2; i < x/2 + 1; i++)
      if((x %i) == 0) return false;

    return true;
  }
}

class ParmDemo {
  public static void Main() {
    ChkNum ob = new ChkNum();

    for(int i=1; i < 10; i++)
      if(ob.isPrime(i)) Console.WriteLine(i + " is prime.");
      else Console.WriteLine(i + " is not prime.");

  }
}

listing 7
// Add a method that takes two arguments.

using System;

class ChkNum {
  // Return true if x is prime.
  public bool isPrime(int x) {
    for(int i=2; i < x/2 + 1; i++)
      if((x %i) == 0) return false;

    return true;
  }

  // Return the least common denominator.
  public int lcd(int a, int b) {
    int max;

    if(isPrime(a) | isPrime(b)) return 1;

    max = a < b ? a : b;

    for(int i=2; i < max/2 + 1; i++)
      if(((a%i) == 0) & ((b%i) == 0)) return i;

    return 1;
  }
}

class ParmDemo {
  public static void Main() {
    ChkNum ob = new ChkNum();
    int a, b;

    for(int i=1; i < 10; i++)
      if(ob.isPrime(i)) Console.WriteLine(i + " is prime.");
      else Console.WriteLine(i + " is not prime.");

    a = 7;
    b = 8;
    Console.WriteLine("Least common denominator for " +
                      a + " and " + b + " is " +
                      ob.lcd(a, b));

    a = 100;
    b = 8;
    Console.WriteLine("Least common denominator for " +
                      a + " and " + b + " is " +
                      ob.lcd(a, b));

    a = 100;
    b = 75;
    Console.WriteLine("Least common denominator for " +
                      a + " and " + b + " is " +
                      ob.lcd(a, b));

  }
}

listing 8
/*
   Add a parameterized method that computes the
   maximum number of people that can occupy a
   buiding assuming each needs a specified
   minimum space.
*/

using System;

class Building {
  public int floors;    // number of floors
  public int area;      // total square footage of building
  public int occupants; // number of occupants

  // Display the area per person.
  public int areaPerPerson() {
    return area / occupants;
  }

  /* Return the maximum number of occupants if each
     is to have at least the specified minimum area. */
  public int maxOccupant(int minArea) {
    return area / minArea;
  }
}

// Use maxOccupant().
class BuildingDemo {
  public static void Main() {
    Building house = new Building();
    Building office = new Building();

    // assign values to fields in house
    house.occupants = 4;
    house.area = 2500;
    house.floors = 2;

    // assign values to fields in office
    office.occupants = 25;
    office.area = 4200;
    office.floors = 3;
 
    Console.WriteLine("Maximum occupants for house if each has " +
                      300 + " square feet: " +
                      house.maxOccupant(300));

    Console.WriteLine("Maximum occupants for office if each has " +
                      300 + " square feet: " +
                      office.maxOccupant(300));
  }
}

listing 9
// A simple constructor.

using System;

class MyClass {
  public int x;

  public MyClass() {
    x = 10;
  }
}
 
class ConsDemo {
  public static void Main() {
    MyClass t1 = new MyClass();
    MyClass t2 = new MyClass();

    Console.WriteLine(t1.x + " " + t2.x);
  }
}

listing 10
// A parameterized constructor.

using System;

class MyClass {
  public int x;

  public MyClass(int i) {
    x = i;
  }
}
 
class ParmConsDemo {
  public static void Main() {
    MyClass t1 = new MyClass(10);
    MyClass t2 = new MyClass(88);

    Console.WriteLine(t1.x + " " + t2.x);
  }
}

listing 11
// Add a constructor to Building.

using System;

class Building {
  public int floors;    // number of floors
  public int area;      // total square footage of building
  public int occupants; // number of occupants


  public Building(int f, int a, int o) {
    floors = f;
    area = a;
    occupants = o;
  }

  // Display the area per person.
  public int areaPerPerson() {
    return area / occupants;
  }

  /* Return the maximum number of occupants if each
     is to have at least the specified minum area. */
  public int maxOccupant(int minArea) {
    return area / minArea;
  }
}
 
// Use the parameterized Building constructor.
class BuildingDemo {
  public static void Main() {
    Building house = new Building(2, 2500, 4);
    Building office = new Building(3, 4200, 25);

    Console.WriteLine("Maximum occupants for house if each has " +
                      300 + " square feet: " +
                      house.maxOccupant(300));

    Console.WriteLine("Maximum occupants for office if each has " +
                      300 + " square feet: " +
                      office.maxOccupant(300));
  }
}

listing 12
// Use new with a value type.

using System;

class newValue {
  public static void Main() {
    int i = new int(); // initialize i to zero

    Console.WriteLine("The value of i is: " + i);
  }
}

listing 13
// Demonstrate a destructor.

using System;

class Destruct {
  public int x;

  public Destruct(int i) {
    x = i;
  }  

  // called when object is recycled
  ~Destruct() {
    Console.WriteLine("Destructing " + x);
  }
 
  // generates an object that is immediately destroyed
  public void generator(int i) {
    Destruct o = new Destruct(i);
  }

}  
 
class DestructDemo {  
  public static void Main() {  
    int count;

    Destruct ob = new Destruct(0);

    /* Now, generate a large number of objects.  At
       some point, garbage collection will occur.
       Note: you might need to increase the number
       of objects generated in order to force
       garbage collection. */

    for(count=1; count < 100000; count++)
      ob.generator(count);

    Console.WriteLine("Done");
  }  
}

listing 14
using System;

class Rect {
  public int width;
  public int height;

  public Rect(int w, int h) {
    width = w;
    height = h;
  }

  public int area() {
    return width * height;
  }
}

class UseRect {
  public static void Main() {
    Rect r1 = new Rect(4, 5);
    Rect r2 = new Rect(7, 9);

    Console.WriteLine("Area of r1: " + r1.area());

    Console.WriteLine("Area of r2: " + r2.area());

  }
}

listing 15
using System;

class Rect {
  public int width;
  public int height;

  public Rect(int w, int h) {
    this.width = w;
    this.height = h;
  }

  public int area() {
    return this.width * this.height;
  }
}

class UseRect {
  public static void Main() {
    Rect r1 = new Rect(4, 5);
    Rect r2 = new Rect(7, 9);

    Console.WriteLine("Area of r1: " + r1.area());

    Console.WriteLine("Area of r2: " + r2.area());

  }
}

listing 16
public Rect(int width, int height) {
  this.width = width;
  this.height = height;
}