Day 1: Added basic Java programs

Vaishnavi_PerfectNumber.java

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+import java.util.Scanner;
+public class Vaishnavi_PerfectNumber {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        int sum = 0;
+        for (int i = 1; i <= n / 2; i++) {
+            if (n % i == 0)
+                sum += i;
+        }
+        if (sum == n)
+            System.out.println("Perfect Number");
+        else
+            System.out.println("Not a Perfect Number");
+ sc.close();
+    }
+}

Vaishnavi_PowerOfNumber.java

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+import java.util.Scanner;
+public class Vaishnavi_PowerOfNumber {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int base = sc.nextInt();
+        int power = sc.nextInt();
+        double result = Math.pow(base, power);
+        System.out.println(result);
+sc.close();
+    }
+}

Vaishnavi_StrongNumber.java

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+import java.util.Scanner;
+
+public class Vaishnavi_StrongNumber {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        int temp = n;
+        int sum = 0;
+        while (temp > 0) {
+            int d = temp % 10;
+            int fact = 1
+            for (int i = 1; i <= d; i++) {
+                fact *= i;
+            }
+            sum += fact;
+            temp /= 10;
+        }
+        if (sum == n)
+            System.out.println("Strong Number");
+        else
+            System.out.println("Not a Strong Number");
+      sc.close();
+    }
+}