Question

This homework will allow us to check for understanding and comfort with things you should know: Input/output, variables, expressions, conditionals, loops, arrays, functions, and classes.

• Language: Java
• Required parts:

1. Write a program that asks the user for a number, then asks for a second number, and finally prints if the first is smaller than the second, greater than the second, or equal to the second. (10 points)
2. Write a program that asks the user to enter a number, and then using a loop, outputs all integers, that are smaller than the entered number. (15 points)
3. Write a program that creates an array of 10 random numbers. After the array is created, a function receives the array, and returns the index of the highest element. (30 points)
4. Implement a class called Vehicle, with the following methods (45 points):
   • SetNumberOfPassengers(int)
     • Stores the argument value in an attribute
   • GetNumberOfPassengers()
     • Returns the attribute
   • SetNumberOfWheels(int)
     • Stores the argument value in an attribute
   • GetNumberOfWheels()
     • Returns the attribute

• Bonus parts:

1. Write a program that asks the user for a number, and outputs all prime numbers smaller than the number entered (15 points)
2. Implement a class called Bicycle, which (5 points):
   • Inherits from the class Vehicle you implemented in exercise 4 of the required parts above.
   • Sets the number of passengers to 1.
   • Sets the number of wheels to 1.

Answer 1

Write a program that asks the user for a number, then asks for a second number, and finally prints if the first is smaller than the second, greater than the second, or equal to the second. (10 points)

// CompareTwoNumbers.java

import java.util.Scanner;

public class CompareTwoNumbers {

public static void main(String[] args) {

int first,second;

/*

* Creating an Scanner class object which is used to get the inputs

* entered by the user

*/

Scanner sc = new Scanner(System.in);

//Getting the input entered by the user

System.out.print("Enter First Number:");

first=sc.nextInt();

System.out.print("Enter Second Number:");

second=sc.nextInt();

  

if(first<second)

{

System.out.println(first+" is greater than "+second);

}

else if(first>second)

{

System.out.println(first+" is less than "+second);

}

else

{

System.out.println(first+" is equal to "+second);

}

  

}

}

======================================

output:

Enter First Number:34
Enter Second Number:56
34 is greater than 56

===========================================

3)

Write a program that creates an array of 10 random numbers. After the array is created, a function receives the array, and returns the index of the highest element. (30 points)

// RandomOf10Nos.java

public class RandomOf10Nos {
   public static void main(String[] args) {
      
   int nos[]=new int[10];
   for(int i=0;i<nos.length;i++)
   {
       nos[i]=(int)(Math.random()*(100))+1;
   }

   int maxIndex=findLargestElementIndex(nos);
   System.out.println("Largest Element index is :"+maxIndex);
   }

   private static int findLargestElementIndex(int[] nos) {
       int maxIndex=0;
       int max=nos[0];
       for(int i=0;i<nos.length;i++)
       {
           if(max<nos[i])
           {
               max=nos[i];
               maxIndex=i;
           }
       }
       return maxIndex;
   }

}

=======================================

Output:

Largest Element index is :7

=========================================

4)

// Vehicle.java

public class Vehicle {
   private int numberOfPassengers;
   private int numberOfWheels;

   /**
   * @param numberOfPassengers
   * @param numberOfWheels
   */
   public Vehicle(int numberOfPassengers, int numberOfWheels) {
       this.numberOfPassengers = numberOfPassengers;
       this.numberOfWheels = numberOfWheels;
   }

   /**
   * @return the numberOfPassengers
   */
   public int getNumberOfPassengers() {
       return numberOfPassengers;
   }

   /**
   * @param numberOfPassengers
   * the numberOfPassengers to set
   */
   public void setNumberOfPassengers(int numberOfPassengers) {
       this.numberOfPassengers = numberOfPassengers;
   }

   /**
   * @return the numberOfWheels
   */
   public int getNumberOfWheels() {
       return numberOfWheels;
   }

   /**
   * @param numberOfWheels
   * the numberOfWheels to set
   */
   public void setNumberOfWheels(int numberOfWheels) {
       this.numberOfWheels = numberOfWheels;
   }

}

=========================================

// Bicycle.java

public class Bicycle extends Vehicle {
public Bicycle() {
   super(1,1);
   }

}

=====================================

// Test.java

public class Test {

   public static void main(String[] args) {

       Bicycle b=new Bicycle();
       System.out.println("No of Passengers :"+b.getNumberOfPassengers());
       System.out.println("No of Wheels :"+b.getNumberOfWheels());
      

   }

}

====================================

Output:

No of Passengers :1
No of Wheels :1

==================================

Write a program that asks the user for a number, and outputs all prime numbers smaller than the number entered (15 points)

// PrimeNumbers.java

import java.util.Scanner;

public class PrimeNumbers {

   public static void main(String[] args) {
int num;

       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);

       //Getting the input entered by the user
System.out.print("Enter a number :");
num=sc.nextInt();
for(int i=2;i<num;i++)
{
   if(isPrime(i))
   {
       System.out.print(i+" ");
   }
  
}
System.out.println();

   }

//This method will check whether the number is prime or not
private static boolean isPrime(int n) {
// If the user entered number is '2' return true
if (n == 2)
return true;
for (int i = 2; i * i <= n; i++) {
if (n % i == 0)
return false;
}
return true;
}

}

=========================================

output:

Enter a number :50
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47

=======================================Thank You