Practice questions of java

 

1. Write a program in Java to check if a number is even or odd in Java? (input 2 output true, input 3: output false)

A number is called even if it is completely divisible by two and odd if it's not entirely divisible by two. For example, number 4 is even number because when you do 4/2, the remainder is 0, which means 4 is completely divisible by 2. On the other hand, 5 is an odd number because 5/2 will result in the remainder as 1. See here to find 

import java.util.Scanner;
public class EvenOddTest{

   
    public static void main(String args[]){              
       
        //scanner to get input from user
        Scanner console = new Scanner(System.in);
       
        System.out.printf("Enter any number : ");
       
        //return the user input as integer
        int number = console.nextInt();
       
        //if remainder is zero than even number
        if((number %2)==0){
            System.out.printf("number %d is even number %n" , number); //%d -decimal %n new line
           
        } else{
            //number is odd in Java
            System.out.printf("number %d is odd number %n", number);
        }          
       
        //Finding Even and Odd number using Bitwise AND operator in Java.
       
        System.out.printf("Finding number if it's even or odd using bitwise AND operator %n");
       
        //For Even numbers
        //XXX0
        //0001 AND
        //0000
        if( (number&1) == 0){
            System.out.printf("number %d is even number %n" , number);
        }else{
            System.out.printf("number %d is odd number %n", number);
        }
       
    }
   
 
}
Output:
Enter any number: 17
number 17 is an odd number
Finding number if its even or odd using bitwise AND operator
number 17 is an odd number
Enter any number: 12
number 12 is an even number
Finding number if its even or odd using bitwise AND operator
number 12 is an even number

Practice questions on Let's program

• Level 1

Level 1

1.

Write a program to print
*
**
***
****
on screen.

class Ans{
  public static void main(String[] args){
    System.out.println("*\n**\n***\n****");
  }
}

---

2.

Print the following pattern on the screen
*****
 *** 
  *  
 *** 
*****

class Ans{
  public static void main(String[] args){
    System.out.println("*****\n *** \n  *  \n *** \n*****");
  }
}

---

3.

Write a program to print the sum of the numbers 2, 4 and 5.

class Ans{
  public static void main(String[] args){
    System.out.println(2+4+5);
  }
}

---

4.

Write a program to print the difference and product of the numbers 45 and 32.

class Ans{
  public static void main(String[] args){
    System.out.println(45-32);
    System.out.println(45*32);
  }
}

---

5.

Write a program to get the following output.
Hey there,
I am data!

class Ans{
  public static void main(String[] args){
    System.out.println("Hey there,\nI am data!");
  }
}