Recursion | Recursion on Arrays | Max Value | Sum of arrays | Lecture 32 | Java & DSA Course

 J    A    V    A             C    O    D     E

       1. Write a program to print all the values in an Array Recursively       

     </>   RecArrayPrinting.java     

// Printing ARRAY elements :

package Recursion;
import java.util.Scanner;

public class RecArrayPrinting {
     public static void print(int[]arr,int n){
          if(n==0) return ;
          print(arr,n-1);
          System.out.print(arr[n-1]+" ");

     }
     public static void main(String[] args) {
          Scanner sc=new Scanner(System.in);
          System.out.println("Enter no. of elements: ");
          int n=sc.nextInt();
          int []arr=new int[n];
          for(int i=0;i<n;i++)
               arr[i]=sc.nextInt();
          print(arr,n);

          sc.close();
     }
}
      2. Write a program to find the Maximun value in an Array by Recursively       
      </>   RecArrayMaxFnd.java      
// FINDING  MAXIMUM  OF  ARRAY :

package Recursion;
import java.util.Scanner;

public class RecArrayMaxFnd {
     public static void fndMax(int []arr,int n,int max){
          if(max<arr[n]) max=arr[n];
          if(n==0){
               System.out.println("Max. value of this array is: "+max);
               return;
          }
          fndMax(arr,n-1,max);

     }
     public static void main(String[] args) {
          Scanner sc=new Scanner(System.in);
          System.out.println("Enter no. of elements: ");
          int n=sc.nextInt();
          int []arr=new int[n];
          for(int i=0;i<n;i++)
               arr[i]=sc.nextInt();
          int max=arr[n-1];
          fndMax(arr,n-2,max);

          sc.close();

     }
}
      3. Write a program to find the Sum of all elements in an Array by Recursively       
      </>   RecArraySum.java     
// FINDING  SUM  OF  ALL  ELEMENT  IN  AN  ARRAY :

package Recursion;
import java.util.Scanner;

public class RecArraySum {
     public static int addAll(int []arr,int n,int sum){
          sum=sum+arr[n];
          if(n==0) return sum;
          return addAll(arr,n-1,sum);

     }
     public static void main(String[] args) {
          Scanner sc=new Scanner(System.in);
          System.out.println("Enter no. of elements: ");
          int n=sc.nextInt();
          int []arr=new int[n];
          for(int i=0;i<n;i++)
               arr[i]=sc.nextInt();
          int ans=addAll(arr,n-2,arr[n-1]);
          System.out.println(ans);
          sc.close();
     }

}

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