Week 3: Programming Assignment 1

WThis program is related to the generation of Fibonacci numbers.

For example: 0,1, 1,2, 3,5, 8, 13,… is a Fibonacci sequence where 13 is the 8th Fibonacci number.

 
import java.util.Scanner; //This package for reading input
public class Fibonacci { 

public static void main(String args[]) { 
	 Scanner sc = new Scanner(System.in);
	int n=sc.nextInt(); //Read an integer
System.out.println(fib(n)); //Generate and print the n-th Fibonacci                
                                     //number
    } 
static int fib(int n) {
//complete the code segment to find the nth Fibonacci number in the Fibonacci sequence and return the value. Write the function recursively.
if (n==1)
{
    return 0;
}
else if(n==2)
{
   return 1;
}
else
{
  return fib(n - 1) + fib(n - 2);
}
}
}

Week 3: Programming Assignment 2

Define a class Point with two fields x and y each of type double. Also, define a method distance(Point p1, Point p2) to calculate the distance between points p1 and p2 and return the value in double.

Complete the code segment given below. Use Math.sqrt( ) to calculate the square root.

 
import java.util.Scanner;

public class Circle extends Point{
	
public static void main(String[] args) {

	 Scanner sc = new Scanner(System.in);
	 Point p1=new Point();
	 p1.x=sc.nextDouble();
	 p1.y=sc.nextDouble();
	 Point p2=new Point();
	 p2.x=sc.nextDouble();
	 p2.y=sc.nextDouble(); 
	 Circle c1=new Circle();
	c1.distance(p1,p2);
	
  }

}//Complete the code segment to define a class Point with parameter x,y and method distance()for calculating distance between two points.
class Point
{
  double x,y;
//Note: Pass objectsof type class Point as argument in distance() method.  
  void distance(Point p1,Point p2)
  {
  double d;  
    d=Math.sqrt(((p2.x-p1.x)*(p2.x-p1.x))+((p2.y-p1.y)*(p2.y-p1.y)));
    System.out.print(d);
  }
}


	   
	   
 Explanation Click here to wtach the video 

Week 3: Programming Assignment 3

A class Shape is defined with two overloading constructors in it. Another class Test1 is partially defined which inherits the class Shape. The class Test1 should include two overloading constructors as appropriate for some object instantiation shown in main() method. You should define the constructors using the super class constructors. Also, override the method calculate( ) in Test1 to calculate the volume of a Shape.

 
import java.util.Scanner;
class Shape{
double length, breadth;
Shape(double l, double b){ //Constructor to initialize a Shape object  
length = l;
breadth= b;
}
Shape(double len){    //Constructor to initialize another Shape object  
length = breadth = len;
}
double calculate(){// To calculate the area of a shape object
return length * breadth ;
}
}
public class Test1 extends Shape{
double height;
//Create a derived class constructor which can call the one parametrized constructor of the base class
Test1(double len,double h)
{
  super(len);
  height=h;
}
//Create a derived class constructor which can call the two parametrized constructor of the base class
Test1(double l,double b,double h)
{
  super(l,b);
  height=h;
}

//Override the method calculate() in the derived class to find the volume of a shape instead of finding the area of a shape
double calculate(){// To calculate the area of a shape object
return length * breadth*height ;
}
public static void main(String args[]){
	Scanner sc = new Scanner(System.in);//Create an object to read                                                               
                                          //input
	double l=sc.nextDouble(); //Read length
	double b=sc.nextDouble(); //Read breadth	
	double h=sc.nextDouble(); //Read height
	Test1 myshape1 = new Test1(l,h);
	Test1 myshape2 = new Test1(l,b,h);
	double volume1;
	double volume2;
	volume1 = myshape1.calculate();
	volume2=myshape2.calculate();
	System.out.println(volume1);
	System.out.println(volume2);
	}
}

Week 3: Programming Assignment 4

This program to exercise the call of static and non-static methods. A partial code is given defining two methods, namely sum( ) and multiply ( ). You have to call these methods to find the sum and product of two numbers. Complete the code segment as instructed.
 
import java.util.Scanner;
class QuestionScope {
int sum(int a, int b){ //non-static method
        return a + b;
    }
static int multiply(int a, int b){ //static method
        return a * b;
    }
}
public class Exercise3_4{
public static void main( String[] args ) {
        Scanner sc = new Scanner(System.in);
		int n1=sc.nextInt();
		int n2=sc.nextInt();
		//Called the method sum() to find the sum of two numbers.
QuestionScope q=new QuestionScope();
System.out.println(q.sum(n1,n2));
//Called the method multiply() to find the product of two numbers.
System.out.print(QuestionScope.multiply(n1,n2));
}
}




	   
Week 3: Programming Assignment 5
		
Complete the code segment to swap two numbers using call by object reference.
			
 
import java.util.Scanner;
class Question {  //Define a class Question with two elements e1 and e2.
  Scanner sc = new Scanner(System.in);
int e1 = sc.nextInt();  //Read e1
int e2 = sc.nextInt();  //Read e2
}
public class Exercise3_5{
/ Define static method swap()to swap the values of e1 and e2 of class Question.
static void swap(Question t)
{
  t.e1=t.e1+t.e2;
  t.e2=t.e1-t.e2;
  t.e1=t.e1-t.e2;
}
  public static void main(String[] args) {
//Create an object of class Question
	Question t = new Question ();
  //Call the method swap()
swap(t);

System.out.println(t.e1+" "+t.e2);    
  }

}
	   
	   



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