OOPS PRACTICAL CLASS #1 Questions and Answer

QUESTIONS:

ANSWERS:

1.)

class HelloWorld {

// Your program begins with a call to main().

// Prints "Hello, World" to the terminal window.

public static void main(String args[]) {

System.out.println("Hello, World");

}

2.)

import java.util.*;

class grade

{

public static void main(String args[])

{

Scanner sc=new Scanner(System.in);

int n;

System.out.println("Enter the Marks: ");

n=sc.nextInt();

if(n>90 && n<=100)

{

System.out.println("The Grade is: O");

}

else if(n>80 && n<=90)

{

System.out.println("The Grade is: E");

}

else if(n>70 && n<=80)

{

System.out.println("The Grade is: A");

}

else if(n>60 && n<=70)

{

System.out.println("The Grade is: B");

}

else if(n>50 && n<=60)

{

System.out.println("The Grade is: C");

}

else if(n>40 && n<=50)

{

System.out.println("The Grade is: D");

}

else if(n<40)

{

System.out.println("The Grade is: F");

}

else

{

System.out.println("INVALID INPUT");

}

3.)

// Java program to find the sum of numbers in a given range

import java.util.*;

public class Main

{

public static void main(String[] args)

{

int start, end;

Scanner sc = new Scanner(System.in);

start = sc.nextInt();

end = sc.nextInt();

int i, sum = 0;

for(i = start; i <= end; i++)

{

if(i>0)

{

sum = sum + i;

}

System.out.print(sum);

}

4.)

import java.util.Scanner;
public class TableExample
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.print("Enter number: ");
//reading a number whose table is to be print
int num=sc.nextInt();
//loop start execution form and execute until the condition i<=10 becomes false
for(int i=1; i <= 10; i++)
{
//prints table of the entered number
System.out.println(num+" * "+i+" = "+num*i);
}
}
}

5.)

USING FOR LOOP

class Star {

public static void main(String[] args) {

int rows = 5;

for (int i = 1; i <= rows; ++i) { //Outer loop for rows

for (int j = 1; j <= i; ++j) { //Inner loop for Col

System.out.print("* "); //Print *

}

System.out.println(); //New line

}

USING WHILE LOOP

import java.io.*;

class star{

    public static void main(String[] args)

{

        int r = 1, c = 0, n = 5;

        // the while loop check the conditions until the

        // condition is false. if it is true then enter in

        // to loop and execute the statements

        while (r <= n) {

            while (c <= r - 1) {

                // printing the required pattern

                System.out.print("* ");

                c++;

}

            r++;

            c = 0;

            // new line after each row

            System.out.println();

}

}

}

USING DO-WHILE LOOP

class Star{
public static void main(String args[]){
int row=1,column=1;
int x;
do{
x=5;
do{
System.out.print("");
x--;
}while(x>=row);
column=1;
do{
System.out.print("* ");
column++;
}while(column<=row);
System.out.println(" ");
row++;
}while (row<=5);
}
}

6.)

//Java Program to find the Factorial of a Number

import java.util.*;

public class Main

{

public static void main(String []args)

{

//Take input from the user

//Create an instance of the Scanner Class

Scanner sc=new Scanner(System.in);

//Declare and Initialize the variable

System.out.println("Enter the number: ");

int num=sc.nextInt();

int i=1,fact=1;

while(i<=num)

{

fact=fact*i;

i++;

}

System.out.println("Factorial of the number: "+fact);

}

7.)

import java.util.Scanner;

class Rev

{

public static void main(String[] arg)

{

int a,res=0,n;

Scanner sc=new Scanner(System.in);

System.out.println("Enter a number");

n=sc.nextInt();

while(n!=0)

{

a=n%10;

res=(res*10)+a;

n=n/10;

}

System.out.println("reverse of a number is "+res);

}

}

8.)

import java.util.Scanner;

public class Main
{
   public static void main(String[] args)
   {
      int num, i, count=0;
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter a Number: ");
      num = s.nextInt();
      
      for(i=2; i<num; i++)
      {
         if(num%i == 0)
         {
            count++;
            break;
         }
      }
      
      if(count==0)
         System.out.println("\nIt is a Prime Number.");
      else
         System.out.println("\nIt is not a Prime Number.");
   }
}

9.)

import java.util.Scanner;
class Perfect
{
	public static void main(String arg[])	
	{
	    long n,sum=0;
             	    Scanner sc=new Scanner(System.in);	   	 
	    System.out.println("Enter a number");
                   n=sc.nextLong();
	    int i=1;
	    while(i<=n/2)
	    {
	       if(n%i==0)
	       {
		sum+=i;
	       }
	      i++;
	    }
	if(sum==n)
	{
	System.out.println(n+" is a perfect number");
               } 
	else
	System.out.println(n+" is not a  perfect number"); 
	}
}

10.)

import java.util.Scanner; public class Armstrong { public static void main(String[] args) { int my_input, my_temp, my_remainder, my_result; my_result = 0; Scanner my_scanner = new Scanner(System.in); System.out.print("Enter the number : "); my_input = my_scanner.nextInt(); my_temp = my_input; while (my_temp != 0){ my_remainder = my_temp % 10; my_result += Math.pow(my_remainder, 3); my_temp /= 10; } if(my_result == my_input) System.out.println(my_input + " is an Armstrong number"); else System.out.println(my_input + " is not an Armstrong number"); } }

OOPS PRACTICAL CLASS #1 Questions and Answer

QUESTIONS:

ANSWERS: