Task 2

src/main/java/Task2/IsPrimeNumber.java

+package Task2;
+
+
+public class IsPrimeNumber {
+
+    public static void main(String[] args) {
+        int countPrimes = 0;
+        for (int i = 2; i < 10000; i++) {
+            if (isPrime(i)) countPrimes++;
+        }
+
+        System.out.println("Number of prime numbers less than 10000: " + countPrimes);
+    }
+
+    public static boolean isPrime(int number) {
+        return number > 1 && java.math.BigInteger.valueOf(number).isProbablePrime(50);
+    }
+}
+
+

src/main/java/Task2/Palindrome.java

+package Task2;
+
+import java.util.Scanner;
+
+public class Palindrome {
+
+    public static void main(String[] args) {
+        try (Scanner scanner = new Scanner(System.in)) {
+            System.out.print("Enter an integer: ");
+            int number = scanner.nextInt();
+            System.out.println(isPalindrome(number) ? "Palindrome" : "Not a palindrome");
+        }
+    }
+
+    public static boolean isPalindrome(int number) {
+        return number == reverse(number); // Use iterative reverse for simplicity
+    }
+
+    // Iterative reverse function for clarity
+    public static int reverse(int number) {
+        int reversed = 0;
+        while (number != 0) {
+            reversed = reversed * 10 + number % 10;
+            number /= 10;
+        }
+        return reversed;
+    }
+}
+

src/main/java/Task2/PalindromePrimes.java

+package Task2;
+
+public class PalindromePrimes {
+
+    public static void main(String[] args) {
+        int targetCount = 100;
+        int numbersPerLine = 10;
+        int count = 0;
+
+        for (int num = 2; count < targetCount; num++) {  // Combine main logic for brevity
+            if (isPalindromicPrime(num)) {
+                System.out.print(num + " ");
+                count++;
+                if (count % numbersPerLine == 0) {
+                    System.out.println();
+                }
+            }
+        }
+    }
+
+    public static boolean isPalindromicPrime(int num) {
+        return isPrime(num) && isPalindrome(num);
+    }
+
+    public static boolean isPrime(int num) {
+        if (num <= 1) { // Handle invalid cases upfront
+            return false;
+        }
+        for (int i = 2; i * i <= num; i++) { // Only check up to the square root
+            if (num % i == 0) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public static boolean isPalindrome(int num) {
+        int reversed = 0;
+        int original = num;
+        while (num > 0) {  // Reverse the number
+            reversed = reversed * 10 + num % 10;
+            num /= 10;
+        }
+        return reversed == original;
+    }
+}
+
+
+

src/main/java/Task2/PasswordChecker.java

+package Task2;
+
+import java.util.Scanner;
+
+public class PasswordChecker {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        System.out.print("Enter a password: ");
+        String password = scanner.nextLine();
+
+        boolean valid = password.length() >= 8 && password.matches("[a-zA-Z0-9]*") && password.replaceAll("[^0-9]", "").length() >= 2;
+
+        if (valid) {
+            System.out.println("Valid Password");
+        } else {
+            System.out.println("Invalid Password");
+        }
+    }
+}

src/main/java/Task2/PatternDisplay.java

+package Task2;
+
+public class PatternDisplay {
+    public static void main(String[] args) {
+        displayPattern(5);
+    }
+
+    public static void displayPattern(int n) {
+        for (int i = 1; i <= n; i++) {
+            // Print leading spaces
+            for (int j = 1; j <= n - i; j++) {
+                System.out.print("   ");
+            }
+
+            // Print numbers in descending order
+            for (int k = i; k >= 1; k--) {
+                System.out.print(k + " ");
+            }
+            System.out.println();
+        }
+    }
+}

src/main/java/Task2/RandomMatrix.java

+package Task2;
+
+import java.util.Scanner;
+
+public class RandomMatrix {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        System.out.print("Enter number: ");
+        int n = scanner.nextInt();
+
+        for (int i = 0; i < n; i++) {  // Combine logic for brevity
+            for (int j = 0; j < n; j++) {
+                System.out.print((int) (Math.random() * 2) + " ");
+            }
+            System.out.println();
+        }
+    }
+}

src/main/java/Task2/ReverseInteger.java

+package Task2;
+
+import java.util.Scanner;
+
+public class ReverseInteger {
+
+    public static void main(String[] args) {
+        try (Scanner scanner = new Scanner(System.in)) { // Use try-with-resources for cleaner resource management
+            System.out.print("Enter an integer: ");
+            int number = scanner.nextInt();
+
+            System.out.print("The reversed integer is: ");
+            reverse(number); // Use iterative reverse for clarity
+        }
+    }
+    public static void reverse(int number) {
+        int reversed = 0;
+        while (number != 0) {
+            reversed = reversed * 10 + number % 10;  // Build the reversed number digit by digit
+            number /= 10;                             // Remove the last digit from the original number
+        }
+        System.out.println(reversed);
+    }
+}

src/main/java/Task2/SeriesComputation.java

+package Task2;
+
+public class SeriesComputation {
+    public static void main(String[] args) {
+        System.out.println("i\tm(i)");
+        System.out.println("----------");
+
+        for (int a = 1; a <= 20; a++) {
+            double m = 0;  // Initialize m within the loop for clarity
+            for (int j = 1; j <= a; j++) {
+                m += j / (double) (j + 1);  // Cast to double for accuracy
+            }
+            System.out.printf("%d\t%.4f\n", a, m);
+        }
+    }
+}

src/main/java/Task2/SortedNumbers.java

+package Task2;
+
+import java.util.Scanner;
+
+public class SortedNumbers {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter three numbers: ");
+        double input1 = scanner.nextDouble();
+        double input2 = scanner.nextDouble();
+        double input3 = scanner.nextDouble();
+
+        System.out.println("Numbers in increasing order:");
+        if (input1 <= input2 && input1 <= input3) {
+            if (input2 <= input3) {
+                System.out.println(input1 + ", " + input2 + ", " + input3);
+            } else {
+                System.out.println(input1 + ", " + input3 + ", " + input2);
+            }
+        } else if (input2 <= input1 && input2 <= input3) {
+            if (input1 <= input3) {
+                System.out.println(input2 + ", " + input1 + ", " + input3);
+            } else {
+                System.out.println(input2 + ", " + input3 + ", " + input1);
+            }
+        } else {
+            if (input1 <= input2) {
+                System.out.println(input3 + ", " + input1 + ", " + input2);
+            } else {
+                System.out.println(input3 + ", " + input2 + ", " + input1);
+            }
+        }
+    }
+}

src/main/java/Task2/pentagonal.java

+package Task2;
+
+public class pentagonal {
+
+    public static void main(String[] args) {
+        int count = 0;
+
+        for (int i = 1; i <= 100; i++) {
+            System.out.printf("%7d", getPentagonalNumber(i));
+            count++;
+
+            if (count % 10 == 0) {
+                System.out.println();
+                count = 0;
+            }
+        }
+    }
+    public static int getPentagonalNumber(int n) {
+        return n * (3 * n - 1) / 2;
+    }
+}

src/main/java/org/example/CalculatingEnergy.java → src/main/java/org/Task1/CalculatingEnergy.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/CelsiusToFahrenheit.java → src/main/java/org/Task1/CelsiusToFahrenheit.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/FindBMI.java → src/main/java/org/Task1/FindBMI.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/FutureDay.java → src/main/java/org/Task1/FutureDay.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/JavaDiagram.java → src/main/java/org/Task1/JavaDiagram.java

-package org.example;
+package org.Task1;
 
 public class JavaDiagram {
 

src/main/java/org/example/MinutesToYears.java → src/main/java/org/Task1/MinutesToYears.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/MonthIntoEnglish.java → src/main/java/org/Task1/MonthIntoEnglish.java

-package org.example;
+package org.Task1;
 
 import java.util.Random;
 

src/main/java/org/example/PopulationOfUs.java → src/main/java/org/Task1/PopulationOfUs.java

-package org.example;
+package org.Task1;
 
 public class PopulationOfUs {
     public static void main(String[] args) {

src/main/java/org/example/RevisedBMI.java → src/main/java/org/Task1/RevisedBMI.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/SortThreeIntegers.java → src/main/java/org/Task1/SortThreeIntegers.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/SpeedMeter.java → src/main/java/org/Task1/SpeedMeter.java

-package org.example;
+package org.Task1;
 
 public class SpeedMeter {
 

src/main/java/org/example/SumTheDigits.java → src/main/java/org/Task1/SumTheDigits.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;
 

src/main/java/org/example/TableofAndNumeric.java → src/main/java/org/Task1/TableofAndNumeric.java

-package org.example;
+package org.Task1;
 
 public class TableofAndNumeric {
 

src/main/java/org/example/TriangleArea.java → src/main/java/org/Task1/TriangleArea.java

-package org.example;
+package org.Task1;
 
 import java.util.Scanner;