java programming assignment answers.txt

java programming assignment answers 
1. check if entered number is even or odd

package com.mycompany.evenoddcheck;

import java.util.Scanner;
public class Evenoddcheck {

     public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        // Prompt user for input
        System.out.print("Enter a number: ");
        int number = scanner.nextInt();
        
        // Check if the number is even or odd
        if (number % 2 == 0) {
            System.out.println(number + " is an even number.");
        } else {
            System.out.println(number + " is an odd number.");
        }
        
        scanner.close();
    }
}

2.enter grade and display output

import java.util.Scanner;
public class Gradecheck {

  public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        // Prompt user for input
        System.out.print("Enter your grade (A, B, C, D, F): ");
        char grade = scanner.next().toUpperCase().charAt(0); // Convert to uppercase for consistency
        
        // Determine the message based on the grade using switch statement
        switch (grade) {
            case 'A':
                System.out.println("Excellent! Keep up the great work!");
                break;
            case 'B':
                System.out.println("Well done! Good job!");
                break;
            case 'C':
                System.out.println("You passed! But needs improvement.");
                break;
            case 'D':
                System.out.println("You need to work harder. Don't give up!");
                break;
            case 'F':
                System.out.println("Failing is part of learning. Try again!");
                break;
            default:
                System.out.println("Invalid grade entered. Please enter A, B, C, D, or F.");
        }
        
        scanner.close();
    }
}


3. java program for leap or whole year
import java.util.Scanner;
public class Whole_and_leap_year {

    public static void main(String[] args) {
       Scanner scanner = new Scanner(System.in);
        
        // Prompt user for input
        System.out.print("Enter a year: ");
        int year = scanner.nextInt();
        
        // Check if the year is a leap year
        boolean isLeapYear = false;

        if (year % 4 == 0) {
            if (year % 100 == 0) {
                if (year % 400 == 0) {
                    isLeapYear = true; // Divisible by 400
                }
            } else {
                isLeapYear = true; // Divisible by 4 but not by 100
            }
        }

        // Output result
        if (isLeapYear) {
            System.out.println(year + " is a leap year.");
        } else {
            System.out.println(year + " is not a leap year.");
        }

        scanner.close();
    }
}

4.finding the largest number

import java.util.Scanner;
public class Thelargest {

    public static void main(String[] args) {
          Scanner scanner = new Scanner(System.in);
        
        // Prompt user for input
        System.out.print("Enter the first number: ");
        int num1 = scanner.nextInt();
        
        System.out.print("Enter the second number: ");
        int num2 = scanner.nextInt();
        
        System.out.print("Enter the third number: ");
        int num3 = scanner.nextInt();
        
        // Determine the largest number using if-else-if statements
        if (num1 >= num2 && num1 >= num3) {
            System.out.println(num1 + " is the largest number.");
        } else if (num2 >= num1 && num2 >= num3) {
            System.out.println(num2 + " is the largest number.");
        } else {
            System.out.println(num3 + " is the largest number.");
        }
        
        scanner.close();
    }
}

5. checking if it is negative, positive or zero

import java.util.Scanner;
public class Checknumber {

    public static void main(String[] args) {
      Scanner scanner = new Scanner(System.in);
        
        // Prompt user for input
        System.out.print("Enter a number: ");
        double number = scanner.nextDouble();
        
        // Check whether the number is positive, negative, or zero
        if (number > 0) {
            System.out.println(number + " is a positive number.");
        } else if (number < 0) {
            System.out.println(number + " is a negative number.");
        } else {
            System.out.println("The number is zero.");
        }
        
        scanner.close();
    }
}

6.triangle pattern
public class Trianglepattern {

    public static void main(String[] args) {
        int rows = 7; // Number of rows for the triangle
        
        for (int i = 1; i <= rows; i++) { // Loop for each row
            for (int j = 1; j <= i; j++) { // Loop for printing numbers in each row
                System.out.print(j + ""); // Print numbers from 1 to i
            }
            System.out.println(); // Move to the next line after each row
        }
    }
7. displaying diamond according to the input of rows from user

import java.util.Scanner;
public class Diamond {

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

        // Prompt user for input
        System.out.print("Enter the number of rows for the diamond: ");
        int rows = scanner.nextInt();

        // Upper part of the diamond
        for (int i = 1; i <= rows; i++) {
            // Print spaces
            for (int j = i; j < rows; j++) {
                System.out.print(" ");
            }
            // Print stars
            for (int j = 1; j <= (2 * i - 1); j++) {
                System.out.print("*");
            }
            System.out.println();
        }

        // Lower part of the diamond
        for (int i = rows - 1; i >= 1; i--) {
            // Print spaces
            for (int j = rows; j > i; j--) {
                System.out.print(" ");
            }
            // Print stars
            for (int j = 1; j <= (2 * i - 1); j++) {
                System.out.print("*");
            }
            System.out.println();
        }

        scanner.close();
    }
}

8. calculating average of array elements

public class Arrayaverage {

    public static void main(String[] args) {
            // Input array
        int[] array = {10, 12, 34, 23, 56, 78};
        
        // Calculate the sum of the array elements
        int sum = 0;
        for (int number : array) {
            sum += number;
        }
        
        // Calculate the average
        double average = (double) sum / array.length;
        
        // Print the average
        System.out.println("The average of the array elements is: " + average);
    }
}

9. reversing an array

public class Reverse {

    public static void main(String[] args) {
        // Input array
        int[] array = {3, 4, 6, 1, 9, 7, 5, 8};
        
        // Print original array
        System.out.print("Original Array: ");
        printArray(array);
        
        // Reverse the array using a for loop
        for (int i = 0; i < array.length / 2; i++) {
            // Swap elements
            int temp = array[i];
            array[i] = array[array.length - 1 - i];
            array[array.length - 1 - i] = temp;
        }
        
        // Print the reversed array
        System.out.print("Reversed Array: ");
        printArray(array);
    }
    
    // Method to print the array using streams
    public static void printArray(int[] array) {
        // Using Java Streams to print the array
        System.out.println(java.util.Arrays.toString(array));
    }
}

10. largest interger element in an array

public class Largest {

    public static void main(String[] args) {
       // Input array
        int[] array = {34, 23, 12, 45, 67, 89, 234, 26, 10, 30, 43};
        
        // Initialize the largest element
        int largest = array[0]; // Assume the first element is the largest
        
        // Loop through the array to find the largest element
        for (int i = 1; i < array.length; i++) {
            if (array[i] > largest) {
                largest = array[i]; // Update largest if current element is greater
            }
        }
        
        // Print the largest element
        System.out.println("The largest element in the array is: " + largest);
    }
}