From e2358a2a5279a9cec24c36456cb0f5967cf8ee4b Mon Sep 17 00:00:00 2001
From: Ankit tanwar <AnkitT0204@users.noreply.github.com>
Date: Sat, 3 Oct 2020 14:21:51 +0530
Subject: [PATCH] added a 2D array 90 degree rotation code

---
 PrintHelloWorld/HelloWorldMap.java | 13 ---------
 rotateby90degree.java              | 47 ++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 13 deletions(-)
 create mode 100644 rotateby90degree.java

diff --git a/PrintHelloWorld/HelloWorldMap.java b/PrintHelloWorld/HelloWorldMap.java
index f28aa5f..e69de29 100644
--- a/PrintHelloWorld/HelloWorldMap.java
+++ b/PrintHelloWorld/HelloWorldMap.java
@@ -1,13 +0,0 @@
-import java.util.HashMap;
-import java.util.Map;
-
-public class HelloWorldMap {
-    public static void main(String[] args) {
-        Map<String, String> map = new HashMap<>();
-        map.put("helloWorld", "Hello World!");
-
-        for (String key: map.keySet()) {
-            System.out.println(map.get(key));
-        }
-    }
-}
\ No newline at end of file
diff --git a/rotateby90degree.java b/rotateby90degree.java
new file mode 100644
index 0000000..53467ba
--- /dev/null
+++ b/rotateby90degree.java
@@ -0,0 +1,47 @@
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    public static void main(String[] args) throws Exception {
+      Scanner sc= new Scanner(System.in);
+      int n=sc.nextInt();
+      int arr[][]=new int [n][n];
+      for(int i=0;i<arr.length;i++){
+          for(int j=0;j<arr.length;j++){
+              arr[i][j]=sc.nextInt();
+         
+      }
+      }
+      for(int i=0;i<arr.length;i++){
+          for(int j=i;j<arr[0].length;j++){
+              int temp=arr[i][j];
+              arr[i][j]=arr[j][i];
+              arr[j][i]=temp;
+          }
+      }
+      for(int r=0;r<arr.length;r++){
+          int lo=0;
+          int hi=arr[0].length-1;
+          while(lo<hi){
+              int temp=arr[r][lo];
+              arr[r][lo]=arr[r][hi];
+              arr[r][hi]=temp;
+              lo++;
+              hi--;
+          }
+      }
+      display(arr);
+      
+    }
+
+    public static void display(int[][] arr){
+        for(int i = 0; i < arr.length; i++){
+            for(int j = 0; j < arr[0].length; j++){
+                System.out.print(arr[i][j] + " ");
+            }
+            System.out.println();
+        }
+    }
+
+}
\ No newline at end of file