calculate values of array

import java.util.Scanner; public class Main { private static Scanner scanner = new Scanner(System.in); public static void main(String[] args) { Sum arr = new Sum(); setArraysize(arr,5); enterValues(arr); System.out.println("Sigma ==> "); int sigma = 0; sigma = scanner.nextInt(); calculateSigma(sigma); arr.calculateValuesOfArr(); arr.printSumOfValues(); } public static void setArraysize(Sum arr,int size){ arr.setArrAndSize(size); } public static void calculateSigma(int n){ Sum sigma = new Sum(); sigma.sigma(n); sigma.printSigma(); } public static void enterValues(Sum arr){ arr.enterValues(); } }

import java.util.Scanner;

public class Sum {
   private int [] arr;
   private int size ;
   private int arrSum ;
   private int n;
   private int sigma = 0 ;

   private Scanner scanner = new Scanner(System.in);

    public Sum(){

    }
    public Sum(int size) {
        this.size = size;
        this.arr = new int [size];
    }

    public void setArrAndSize(int size){
        this.arr = new int[this.size = size];
        System.out.println("\tArray has been initialized\n");
    }

    public void enterValues(){
        if(this.arr == null){
            System.out.println("\tEnter size of the array\n");
            int size = scanner.nextInt();
            setArrAndSize(size);
        }
        System.out.println("\t(Enter "+this.arr.length+" numbers)\n");
        for(int i = 0; i < this.arr.length ; ++i){
            this.arr[i] = scanner.nextInt();
        }
    }

    public void calculateValuesOfArr(){
        this.arrSum = recursiveSigma(this.size-1);
    }



    private int recursiveSigma( int l){
        if(l == 0 )
            return arr[l];

        return this.arr[l] + recursiveSigma(l-1);

    }

    public  void sigma(int n){
        this.n = n ;
        calculatSigma(n);

    }
    private int  calculatSigma(int n){
        if(n == 0)
             return this.sigma ;
        this.sigma = n + calculatSigma(n-1);
        return this.sigma;
    }

    public void printSumOfValues(){
        System.out.println("Array values = "+this.arrSum+"\n");
    }

    public void printSigma(){
        System.out.println("Sigma "+ this.n+" = "+this.sigma+"\n");
    }
}

Posted by: Guest on July-30-2021

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