📢 Join My WhatsApp Channel JavaWithSumit

Get Daily ICSE Java Notes, Programs & Exam Tips 🚀

👉 Join Now

Important Java Programs for Beginners | Grade, Fibonacci, Armstrong, Pattern & More

Chapter 1: Programs 



Question 1: WAP to check if a number input by the user is even or odd.

Solution: 

import java.util.Scanner;

class EvenOdd
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int n = sc.nextInt();

        if(n % 2 == 0)
            System.out.println("Even Number");
        else
            System.out.println("Odd Number");
    }
}

Input: n=8
Output: Even Number

Question 2: WAP to check if a letter input by user is vowel or consonant.

Solution: 

import java.util.Scanner;
class VowelConsonant
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a letter: ");
        char ch = sc.next().charAt(0);

        ch = Character.toLowerCase(ch);
        if(ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u')
            System.out.println("Vowel");
        else
            System.out.println("Consonant");
    }
}

Input: ch='S'
Output: Consonant

Question 3: WAP to swap values of two variables without creating third variable.

Solution: 

import java.util.Scanner;

class SwapWithoutThird
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter first number: ");
        int a = sc.nextInt();
        System.out.print("Enter second number: ");
        int b = sc.nextInt();

        a = a + b;
        b = a - b;
        a = a - b;
        System.out.println("After Swapping:");
        System.out.println("First Number = " + a);
        System.out.println("Second Number = " + b);
    }
}

Input: a=10,b=20
Output: After Swapping:
            First Number: 20
            Second number: 10

Question 4: Write a function in Java that accepts length, height and width of a cuboid and returns the surface area and volume.

Solution: 

import java.util.Scanner;

public class Cuboid
{
    double surfaceArea(double l, double h, double w)
    {
        return 2 * (l * w + w * h + h * l);
    }
    double volume(double l, double h, double w)
    {
        return l * h * w;
    }
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        Cuboid obj = new Cuboid();

        System.out.print("Enter Length: ");
        double length = sc.nextDouble();

        System.out.print("Enter Height: ");
        double height = sc.nextDouble();

        System.out.print("Enter Width: ");
        double width = sc.nextDouble();

        double sa = obj.surfaceArea(length, height, width);
        double vol = obj.volume(length, height, width);

        System.out.println("Surface Area = " + sa);
        System.out.println("Volume = " + vol);
    }
}
Input: Enter Length: 5
          Enter Height: 4
          Enter Width: 3
Output: Surface Area = 94.0
            Volume = 60.0
            


Question 5: WAP that takes principal amount, interest rate and duration as input from user and print the simple interest.
Solution: 

import java.util.Scanner;

public class SimpleInterest
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        double p, r, t, si;
        System.out.print("Enter Principal Amount: ");
        p = sc.nextDouble();
        System.out.print("Enter Rate of Interest: ");
        r = sc.nextDouble();
        System.out.print("Enter Time Duration: ");
        t = sc.nextDouble();
        si = (p * r * t) / 100;
        System.out.println("Simple Interest = " + si);
    }
}

Input: Enter Principal Amount: 10000
          Enter Rate of Interest: 5
          Enter Time Duration: 2
Output: Simple Interest = 1000.0
            

Question 6: WAP that takes total marks and obtained marks of student and print the grade A++, A+, A, B+, B, C, D according to following slab.
A++    >90
A+      >75
A         >60
B+      >50
B         >45
C         >35
D         <35

Solution: 

import java.util.Scanner;

public class GradeCalculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter total marks: ");
        double total = sc.nextDouble();
        System.out.print("Enter obtained marks: ");
        double obtained = sc.nextDouble();
        double percentage = (obtained / total) * 100;
        System.out.println("Percentage: " + percentage);

        if (percentage > 90) {
            System.out.println("Grade: A++");
        } else if (percentage > 75) {
            System.out.println("Grade: A+");
        } else if (percentage > 60) {
            System.out.println("Grade: A");
        } else if (percentage > 50) {
            System.out.println("Grade: B+");
        } else if (percentage > 45) {
            System.out.println("Grade: B");
        } else if (percentage > 35) {
            System.out.println("Grade: C");
        } else {
            System.out.println("Grade: D");
        }

        sc.close();
    }
}

Input: Enter total marks: 500
          Enter obtained marks: 460
          Percentage: 92.0
Output: Grade: A++

Question 7: Write a calculator program that takes as input two numbers and one operator to perform mathematical operation and prints the calculated result.

Solution: 

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter first number: ");
        double num1 = sc.nextDouble();

        System.out.print("Enter second number: ");
        double num2 = sc.nextDouble();

        System.out.print("Enter operator (+, -, *, /): ");
        char op = sc.next().charAt(0);

        double result;

        switch(op) {
            case '+':
                result = num1 + num2;
                System.out.println("Result = " + result);
                break;

            case '-':
                result = num1 - num2;
                System.out.println("Result = " + result);
                break;

            case '*':
                result = num1 * num2;
                System.out.println("Result = " + result);
                break;

            case '/':
                if (num2 != 0) {
                    result = num1 / num2;
                    System.out.println("Result = " + result);
                } else {
                    System.out.println("Error: Division by zero");
                }
                break;

            default:
                System.out.println("Invalid operator");
        }

        sc.close();
    }
}

Input: Enter first number: 10
          Enter second number: 5
          Enter operator (+, -, *, /): *
Output: Result = 50.0

Question 8: WAP in Java to display fibonacci series up to 10 numbers.

Solution: 

public class Fibonacci {
    public static void main(String[] args) {
        int n = 10;
        int a = 0, b = 1;

        System.out.println("Fibonacci Series up to 10 numbers:");

        for (int i = 1; i <= n; i++) {
            System.out.print(a + " ");

            int next = a + b;
            a = b;
            b = next;
        }
    }
}
Output: Fibonacci Series up to 10 numbers:
            0 1 1 2 3 5 8 13 21 34

Question 9: WAP to check if the given number is a palindrome number.

Solution:
import java.util.Scanner;

public class PalindromeNumber {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

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

        int original = num;
        int reverse = 0;

        while (num != 0) {
            int digit = num % 10;
            reverse = reverse * 10 + digit;
            num = num / 10;
        }

        if (original == reverse) {
            System.out.println("Palindrome Number");
        } else {
            System.out.println("Not a Palindrome Number");
        }

        sc.close();
    }
}

Input: Enter a number: 121
Output: Palindrome Number

Question 10: WAP to check if the given number is an armstrong number.

Solution:
import java.util.Scanner;

public class ArmstrongNumber {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

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

        int original = num;
        int sum = 0;
        int digits = 0;

        // Count digits
        int temp = num;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }

        temp = num;

        // Calculate sum of digits raised to power
        while (temp != 0) {
            int digit = temp % 10;
            sum += Math.pow(digit, digits);
            temp /= 10;
        }

        if (sum == original) {
            System.out.println("Armstrong Number");
        } else {
            System.out.println("Not an Armstrong Number");
        }

        sc.close();
    }
}

Input: Enter a number: 123
Output: Not an Armstrong Number

Question 11: Write a method which accepts three number and return average.
Solution:

public class AverageCalculator {
    public static double findAverage(double a, double b, double c) {
        return (a + b + c) / 3;
    }

    public static void main(String[] args) {
        double result = findAverage(10, 20, 30);
        System.out.println("Average = " + result);
    }
}
Output: Average = 20.0

Question 12: WAP to produce following output.
*
**
***
****
*****
Solution:

public class StarPattern {
    public static void main(String[] args) {

        for (int i = 1; i <= 5; i++) {      // rows
            for (int j = 1; j <= i; j++) {  // columns
                System.out.print("*");
            }
            System.out.println(); // move to next line
        }

    }
}
Output: 
*
**
***
****
*****

Question 13: Design a class Student which stores data about students of your class like their name, test marks, grade etc. and methods to operate on the data.

Solution:
import java.util.Scanner;

public class Student {
    String name;
    int marks;
    char grade;

    // Method to input data
    public void input() {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter name: ");
        name = sc.nextLine();

        System.out.print("Enter marks: ");
        marks = sc.nextInt();
    }

    // Method to calculate grade
    public void calculateGrade() {
        if (marks > 90) {
            grade = 'A';
        } else if (marks > 75) {
            grade = 'B';
        } else if (marks > 60) {
            grade = 'C';
        } else if (marks > 50) {
            grade = 'D';
        } else {
            grade = 'F';
        }
    }

    // Method to display data
    public void display() {
        System.out.println("Name: " + name);
        System.out.println("Marks: " + marks);
        System.out.println("Grade: " + grade);
    }

    public static void main(String[] args) {
        Student s = new Student();

        s.input();
        s.calculateGrade();
        s.display();
    }
}

Input: Enter name: Sumit
          Enter marks: 82
Output: Name: Sumit
            Marks: 82
            Grade: B


Read also:

                    👉Syllabus 2026-27

Comments

Post a Comment

Popular posts from this blog

Introduction to Object Oriented Programming in Java

Image
  Introduction to Object Oriented Programming and Java Introduction Object Oriented Programming (OOP) is a modern programming approach in which a program is designed using objects and classes . Java is a popular object-oriented programming language widely used in schools, colleges, and the software industry. This chapter helps students understand the basic concepts of OOP and Java , which form the foundation of advanced programming. 1. Principles of Object Oriented Programming Object Oriented Programming is based on four main principles : Abstraction Encapsulation Inheritance Polymorphism Procedure Oriented Programming vs Object Oriented Programming Procedure Oriented Programming      Object Oriented Programming Program is divided into functions Program is divided into objects Data is not well protected Data is well protected Less secure More secure Example: C language Example: Java, C++ Reusability is less Reusability is high 1. Abstractio...
Read more

Object Modelling – Entities and Their Behaviour in Java

Image
  Introduction to Object Modelling in Java      Java is an Object-Oriented Programming (OOP) language. In OOP, programs are designed by modelling real-world entities as objects . 👉 Object Modelling means representing real-life things inside a program using: Their properties (data) Their behaviour (actions) Components of Object Modelling Every object consists of three main components : 1. State (Properties / Attributes) State represents the data stored in an object . Examples: Student → Name, Roll Number Car → Color, Speed In Java → Variables int roll ; String name ; 2. Behaviour (Actions / Functions) Behaviour represents what the object can do . Examples: Student → Study, Write Exam Car → Start, Stop In Java → Methods void study () { System . out . println ( "Student is studying" ); } 3. Identity (Unique Name) Each object has a unique identity. Example: Student s1 ; Student s2 ; Here: s1 and s2 are different...
Read more