Added Solutions for three questions in Java

Java/Q10.java

@@ -0,0 +1,19 @@
+import java.util.Scanner;
+
+public class Q10 {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter a number!");
+        int num = scanner.nextInt();
+
+        if(num % 2 == 0)
+            System.out.println("Number is even");
+        else
+            System.out.println("Number is odd");
+
+        scanner.close();
+    }
+
+}

Java/Q13.java

@@ -0,0 +1,29 @@
+import java.util.Scanner;
+
+public class Q13 {
+
+    public static void main(String[] args) {
+
+        Scanner scanner = new Scanner(System.in);
+
+        int a, b, c;
+
+        System.out.print("Enter co-efficient of x^2:  ");
+        a = scanner.nextInt();
+        System.out.print("Enter co-efficient of x:  ");
+        b = scanner.nextInt();
+        System.out.print("Enter constant:  ");
+        c = scanner.nextInt();
+
+        double root1 = (-b + Math.sqrt(b * b - 4 * a * c)) / 2 * a;
+        double root2 = (-b - Math.sqrt(b * b - 4 * a * c)) / 2 * a;
+
+        if (root1 == root2)
+            System.out.println("The root of the quadratic equation is: " + root1);
+        else
+            System.out.println("The two roots of the quadratic equation are: " + root1 + " and " + root2);
+
+        scanner.close();
+    }
+
+}

Java/Q27.java

@@ -0,0 +1,38 @@
+import java.util.Scanner;
+
+public class Q27 {
+
+    static int reverse(int num) {
+
+        int sum = 0;
+
+        while (num > 0) {
+            int temp = num % 10;
+
+            sum = sum * 10 + temp;
+            num /= 10;
+        }
+
+        return sum;
+
+    }
+
+    public static void main(String[] args) {
+
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter the number you want to check for palindrome: ");
+        int num = scanner.nextInt();
+
+        int reversed = reverse(num);
+
+        if(reversed == num)
+            System.out.println(num+" is a palindrome");
+        else
+            System.out.println(num+" is not a palindrome");
+
+        scanner.close();
+
+    }
+
+}