C++ Codes - Basic to Advanced 💻

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//Write a program to reverse the elements of an array public class ArrayReversal { public static void main(String[] args) { int[] numbers = {1, 2, 3, 4, 5}; // Reverse the array in-place. for (int i = 0; i < numbers.length / 2; i++) { int temp = numbers[i]; numbers[i] = numbers[numbers.length - 1 - i]; numbers[numbers.length - 1 - i] = temp; } System.out.print("Reversed array: "); for (int number : numbers) { System.out.print(number + " "); } } }

//Generate and display a series of random numbers within a specified range. import java.util.Random; public class RandomNumberGenerator { public static void main(String[] args) { int min = 1; // Minimum value of the range int max = 100; // Maximum value of the range int numberOfRandoms = 5; // Number of random numbers to generate Random random = new Random(); System.out.println("Random numbers within the range [" + min + ", " + max + "]:"); for (int i = 0; i < numberOfRandoms; i++) { int randomNumber = random.nextInt(max - min + 1) + min; System.out.println(randomNumber); } } }

//Calculate the sum of the digits of a positive integer import java.util.Scanner; public class SumOfDigits { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a positive integer: "); int number = scanner.nextInt(); int sum = 0; // Calculate the sum of digits using a loop. while (number > 0) { sum += number % 10; // Add the last digit to the sum. number /= 10; // Remove the last digit from the number. } System.out.println("Sum of digits: " + sum); } }

//Calculate the area of a triangle given its base and height. import java.util.Scanner; public class TriangleAreaCalculator { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter the base of the triangle: "); double base = scanner.nextDouble(); System.out.print("Enter the height of the triangle: "); double height = scanner.nextDouble(); double area = 0.5 * base * height; System.out.println("The area of the triangle is: " + area); } }

//Convert a decimal number to its binary representation import java.util.Scanner; public class DecimalToBinary { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a decimal number: "); int decimal = scanner.nextInt(); String binary = Integer.toBinaryString(decimal); System.out.println("Binary representation: " + binary); } }

//Calculate the factorial of a given number using recursion public class RecursiveFactorial { public static void main(String[] args) { int number = 5; // Change this to the desired number long factorial = calculateFactorial(number); System.out.println("Factorial of " + number + " is: " + factorial); } // Recursive function to calculate the factorial. private static long calculateFactorial(int n) { if (n == 0) { return 1; } return n * calculateFactorial(n - 1); } }