Create array.java

Java/array.java

@@ -0,0 +1,123 @@
+import java.util.Scanner;
+
+public class array {
+    public static int sum(int arr[]) {
+        int sum = 0;
+        int len = arr.length;
+        for (int i = 0; i < len; i++) {
+            sum = sum + arr[i];
+        }
+        return sum;
+    }
+
+    public static int average(int arr[]) {
+        int len = arr.length;
+        int average = sum(arr) / len;
+        return average;
+    }
+
+    public static void search(int arr[], int a) {
+        int len = arr.length;
+        for (int i = 0; i < len; i++) {
+            if (arr[i] == a) {
+                System.out.println("Element Found");
+                break;
+            } else if (i == len && arr[i] != a) {
+                System.out.println("Element Not Found");
+            }
+        }
+    }
+
+    public static int evensum(int arr[]) {
+        int len = arr.length;
+        int sum = 0;
+        for (int i = 0; i < len; i++) {
+            if (arr[i] % 2 == 0) {
+                sum = sum + arr[i];
+            }
+        }
+        return sum;
+    }
+
+    public static int[] rev(int arr[]) {
+        int len = arr.length;
+        int swap = 0;
+        for (int i = 0; i < len / 2; i++) {
+            swap = arr[i];
+            arr[i] = arr[len - i - 1];
+            arr[len - i - 1] = swap;
+        }
+        return arr;
+    }
+
+    public static void print(int arr[]) {
+        int len = arr.length;
+        System.out.println("The array is : ");
+        for (int i = 0; i < len; i++) {
+            System.out.println(arr[i]);
+        }
+    }
+
+    public static int primecount(int arr[]) {
+        int len = arr.length;
+        int primecount = 0;
+        for (int i = 0; i < len; i++) {
+            int count = 0;
+            for (int j = 1; j <= arr[i]; j++) {
+                if (arr[i] % j == 0) {
+                    count++;
+                }
+            }
+            if (count <= 2) {
+                primecount++;
+            }
+        }
+        return primecount;
+    }
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the size of array");
+        int len = sc.nextInt();
+        int arr[] = new int[len];
+        int a = 0;
+        while (a != 8) {
+            System.out.println(
+                    "Enter a choice\n0)Insert 1)Sum 2)Average 3)Search 4)Evensum 5)Reverse 6)Primecount 7)Print 8)Exit");
+            a = sc.nextInt();
+            switch (a) {
+                case 0:
+                    for (int i = 0; i < len; i++) {
+                        System.out.println("Enter the " + (i + 1) + "th element");
+                        arr[i] = sc.nextInt();
+                    }
+                    break;
+                case 1:
+                    System.out.println("The sum is " + sum(arr));
+                    break;
+                case 2:
+                    System.out.println("The average is " + average(arr));
+                    break;
+                case 3:
+                    System.out.println("Enter the element to search");
+                    int s = sc.nextInt();
+                    search(arr, s);
+                    break;
+                case 4:
+                    System.out.println("The sum of even numbers in array is " + evensum(arr));
+                    break;
+                case 5:
+                    arr = rev(arr);
+                    break;
+                case 6:
+                    System.out.println("The no of prime no in array are " + primecount(arr));
+                    break;
+                case 7:
+                    print(arr);
+                    break;
+
+            }
+        }
+        sc.close();
+    }
+}