Check whether a number is even or odd using if...else statement

 Check whether a number is even or odd using if...else statement

import java.util.Scanner;

public class even1 {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int num = sc.nextInt();

        if(num % 2 == 0)
            System.out.println(num + " is even");
        else
            System.out.println(num + " is odd");
    }
}

When you run the program, the output will be:


Enter a number: 12
12 is even
BUILD SUCCESSFUL (total time: 6 seconds)

Explanation:-

n the above program, a Scanner object, sc is created to read a number from the user's keyboard. The entered number is then stored in a variable num.

Now, to check whether num is even or odd, we calculate its remainder using % operator and check if it is divisible by 2 or not.

For this, we use if...else statement in Java. If num is divisible by 2, we print num is even. Else, we print num is odd.

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Write a program in Java Program to get input from user

Java Program to get input from user
//Let's see the simple example of the Java Scanner class which reads the int, string and double value as an input:
//
import java.util.Scanner; 
class abc{ 
 public static void main(String args[]){ 
   Scanner sc=new Scanner(System.in); 
   
   System.out.println("Enter your rollno"); 
   int rollno=sc.nextInt(); 
   System.out.println("Enter your name"); 
   String name=sc.next(); 
   System.out.println("Enter your fee"); 
   double fee=sc.nextDouble(); 
   System.out.println("Rollno:"+rollno+" name:"+name+" fee:"+fee); 
   sc.close(); 
 } 
} 

Enter your rollno
10
Enter your name
John
Enter your fee
20000
Rollno:10 name:John fee:20000.0

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Write a program in java / example to swap two numbers without using third variable.

using System; 
  public class Swap1 
   { 
     public static void Main(string[] args) 
      { 
       int  a=5, b=10;           
       Console.WriteLine("Before swap a= "+a+" b= "+b);   
       a=a*b; //a=50 (5*10)     
       b=a/b; //b=5 (50/10)     
       a=a/b; //a=10 (50/5)   
       Console.Write("After swap a= "+a+" b= "+b);     
     } 
  }   

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Program to display the grade of student

This program calculates the grade of a student based on the marks entered by user in each subject.

Program prints the grade based on this logic.

If the average of marks is >= 80 then prints Grade ‘A’
If the average is <80 and >=60 then prints Grade ‘B’
If the average is <60 and >=40 then prints Grade ‘C’
else

prints Grade ‘D’

// Write a Program to display the grade of student

import java.util.Scanner;

public class Grade1

{

    public static void main(String args[])

    {

            /* This program assumes that the student has 6 subjects,

             * thats why I have created the array of size 6. You can

             * change this as per the requirement.

             */

        int marks[] = new int[6];

        int i;

        float total=0, avg;

        Scanner sc = new Scanner(System.in);

                       

       

        for(i=0; i<6; i++) {

           System.out.print("Enter Marks of Subject"+(i+1)+":");

           marks[i] = sc.nextInt();

           total = total + marks[i];

        }

        sc.close();

        //Calculating average here

        avg = total/6;

        System.out.print("The student Grade is:     ");

        if(avg>=80)

        {

            System.out.print("A");

        }

        else if(avg>=60 && avg<80)

        {

           System.out.print("B");

        }

        else if(avg>=40 && avg<60)

        {

            System.out.print("C");

        }

        else

        {

            System.out.print("D");

        }

    }

}

·         Explanation:-  Using Scanner class to read user input from the keyboard.

·         Using Scanner class to read a File on the disk.

·         Using Scanner class to read from a String.

Output:-

Enter Marks of Subject1:80

Enter Marks of Subject2:45

Enter Marks of Subject3:67

Enter Marks of Subject4:89

Enter Marks of Subject5:45

Enter Marks of Subject6:78

The student Grade is:     B

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Program to find sum of first n (entered by user) natural numbers

//Program to find sum of first n (entered by user) natural numbers

import java.util.Scanner;

public class abc {

    public static void main(String[] args) {

        int num, count, tot = 0;

        System.out.println("Enter the value of n:");

        //Scanner is used for reading user input

        Scanner scan = new Scanner(System.in);

        //nextInt() method reads integer entered by user

        num = scan.nextInt();

        //closing scanner after use

        scan.close();

        for(count = 1; count <= num; count++){

            tot = tot + count;

        }







        System.out.println("Sum of first "+num+" natural numbers is: "+tot);

    }

}



Output:-

Enter the value of n:

5

Sum of first 5 natural numbers is: 15

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About Me

To understand a programming language you must practice the programs, this way you can study the language faster. This page contains java programs on various java topics such as control statements, loops, classes & objects, functions, arrays etc. All the programs are tested and provided with the output.

 If you new to java and want to learn java before trying out these program, To learn Java programming, refer these tutorials in the given order. These tutorials are written for learners so even if you have no past knowledge in Java, you won’t face any difficulty understanding these tutorials(this page includes core Java tutorial and advanced Java tutorial).

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Write a program to find Larget element of an Array

public class Large1{



    public static void main(String[] args) {

        double[] numArray = { 23.4, -55, 50.0, 33.5, 55.5, 100, 5.7, -66.5 };

        double large = numArray[0];



        for (double num: numArray) {

            if(large < num)

                large = num;

        }



        System.out.format("Largest element = %.2f", large);

    }

}





When you run the program, the output will be:



debug:

Largest element = 100.00

In the above program, we store the first element of the array in the variable large.

Then, large is used to compare other elements in the array. If any number is greater than large, large is assigned the number.

In this way, the largest number is stored in large when it is printed.

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