How to put a Scanner input into an array... for example a couple of numbers

Question

Scanner scan = new Scanner(System.in);
double numbers = scan.nextDouble();
double[] avg =..????

is it a known or an unknown number of entries? – Bozho May 08 '10 at 19:45 — Bozho, May 08 '10 at 19:45

score 23 · Accepted Answer · answered May 08 '10 at 19:44

23

You could try something like this:

public static void main (String[] args)
{
    Scanner input = new Scanner(System.in);
    double[] numbers = new double[5];

    for (int i = 0; i < numbers.length; i++)
    {
        System.out.println("Please enter number");
        numbers[i] = input.nextDouble();
    }
}

It seems pretty basic stuff unless I am misunderstanding you

answered May 08 '10 at 19:44

npinti

50,175
5
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92

This won't work when you go over the array capacity (5). A better option would be to use a List. – Mark Hughes Oct 07 '16 at 06:37
@MarkHughes: Indeed, but the OP asked for an array. – npinti Oct 10 '16 at 05:35
thats why I left it as a comment not an answer. These questions commonly appear in search results :) – Mark Hughes Oct 10 '16 at 05:41

score 8 · Answer 2 · answered May 08 '10 at 19:44

8

You can get all the doubles with this code:

List<Double> numbers = new ArrayList<Double>();
while (scan.hasNextDouble()) {
    numbers.add(scan.nextDouble());
}

answered May 08 '10 at 19:44

Felipe Cypriano

2,697
20
32

how do we add Strings to the `List`, I used this code `while(scanner.hasNext()){ list.add(scanner.next().toString());}` but it gives me `NullPointerException` – Kasun Siyambalapitiya Jun 02 '16 at 17:15

score 3 · Answer 3 · edited Jul 02 '12 at 00:37

3

import java.util.Scanner;

public class Main {
    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner in=new Scanner (System.in);
        int num[]=new int[10];
        int average=0;
        int i=0;
        int sum=0;

        for (i=0;i<num.length;i++) {
            System.out.println("enter a number");
            num[i]=in.nextInt();
            sum=sum+num[i];
        }
        average=sum/10;
        System.out.println("Average="+average);
    }
}

edited Jul 02 '12 at 00:37

kratenko

6,652
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57

answered Jul 02 '12 at 00:01

Jossel M. Barnobal

31
2

This can be used to get the average of the inputs – Kasun Siyambalapitiya Jun 02 '16 at 03:13

Sonu patel · Answer 4 · 2018-11-02T09:59:25.893

3

**Simple solution**
public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int size;
    System.out.println("Enter the number of size of array");
    size = sc.nextInt();
    int[] a = new int[size];
    System.out.println("Enter the array element");
    //For reading the element
    for(int i=0;i<size;i++) {
        a[i] = sc.nextInt();
    }
    //For print the array element
    for(int i : a) {
        System.out.print(i+" ,");
    }
}

edited Nov 02 '18 at 09:59

answered Jun 08 '18 at 05:31

Sonu patel

351
1
8

2

Code is always good, but it also helps to provide some comments about your solution solves the original question. This is a suggestion for further improving this and future answers. – craigcaulfield Jun 08 '18 at 06:01
Thanks man ,so write now its better or some on other formating issue again thanks a lot. – Sonu patel Jun 09 '18 at 14:37

score 1 · Answer 5 · edited May 03 '13 at 11:06

import  java.util.Scanner;

class Array {
public static void main(String a[]){

    Scanner input = new Scanner(System.in);

    System.out.println("Enter the size of an Array");

    int num = input.nextInt();

    System.out.println("Enter the Element "+num+" of an Array");

    double[] numbers = new double[num];

    for (int i = 0; i < numbers.length; i++)
    {

        System.out.println("Please enter number");

        numbers[i] = input.nextDouble();

    }

    for (int i = 0; i < numbers.length; i++)
    {

        if ( (i%3) !=0){

            System.out.print("");

            System.out.print(numbers[i]+"\t");

        } else {
            System.out.println("");

            System.out.print(numbers[i]+"\t");
        }

    }

}

score 1 · Answer 6 · answered Mar 01 '19 at 23:46

1

List<Double> numbers = new ArrayList<Double>();
double sum = 0;

Scanner scan = new Scanner(System.in);
while(scan.hasNext()){
    double value = scan.nextDouble();
    numbers.add(value);
    sum += value;
}

double average = sum / numbers.size();

answered Mar 01 '19 at 23:46

Harsha pps

1,533
2
20
32

Feyyaz · Answer 7 · 2010-05-08T19:43:27.877

0

double [] avg = new double[5];
for(int i=0; i<5; i++)
   avg[i] = scan.nextDouble();

edited May 08 '10 at 19:43

answered May 08 '10 at 19:38

Feyyaz

3,067
4
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50

score 0 · Answer 8 · answered Apr 20 '15 at 08:43

This is a program to show how to give input from system and also calculate sum at each level and average.

package NumericTest;

import java.util.Scanner;

public class SumAvg {


 public static void main(String[] args) {

 int i,n;
 System.out.println("Enter the number of inputs");
 Scanner sc = new Scanner(System.in);
 n=sc.nextInt();
 int a[] = new int [n];

    System.out.println("Enter the inputs");
   for(i=0;i<n;i++){
   a[i] = sc.nextInt();
  System.out.println("Inputs are " +a[i]);
 }

  int sum = 0;
  for(i=0;i<n;i++){
 sum = sum +a[i];
  System.out.println("Sums : " +sum);
 }
  int avg ;
  avg = sum/n;
  System.out.println("avg : " +avg);
  }
 }

score 0 · Answer 9 · edited Oct 02 '19 at 07:26

0

public static void main (String[] args)
{
    Scanner s = new Scanner(System.in);
    System.out.println("Please enter size of an array");
    int n=s.nextInt();
    double arr[] = new double[n];
    System.out.println("Please enter elements of array:");
    for (int i=0; i<n; i++)
    {
        arr[i] = s.nextDouble();
    }
}

edited Oct 02 '19 at 07:26

CKE

1,344
9
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answered Oct 02 '19 at 05:29

Rohit Mittal

60
1
7

1

What's the difference between your answer and selected answer? – Amit Yadav Oct 02 '19 at 06:03

score -1 · Answer 10 · edited Nov 22 '14 at 15:53

-1

import java.util.Scanner;
public class sort {

  public static void main(String args[])
    {
        int i,n,t;          

        Scanner sc=new Scanner(System.in);

        System.out.print("Enter the size of array");

        n=sc.nextInt();

        int a[] = new int[n];

        System.out.println("Enter elements in array");

        for(i=0;i<n;i++)
        {
            a[i]=sc.nextInt();
        }
        t=a[1];

        for(i=0;i<n;i++)
        {
            if(a[i]>t)

                t=a[i];
        }
        System.out.println("Greates integer is" +t);
    }
}

edited Nov 22 '14 at 15:53

Luís Cruz

13,666
16
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answered Nov 22 '14 at 15:34

Vishal Kushwah

1

1

While your answer may solve the question, it is always better if you can provide a description of what the issue was and how your answer solves it. This is a suggestion for further improving this and future answers. – Luís Cruz Nov 22 '14 at 15:54

score -1 · Answer 11 · edited Jul 21 '12 at 22:37

-1

Scanner scan = new Scanner (System.in);

for (int i=0; i<=4, i++){

    System.out.printf("Enter value at index"+i+" :");

    anArray[i]=scan.nextInt();

}

edited Jul 21 '12 at 22:37

Dennis

30,518
9
59
75

answered Mar 27 '12 at 06:19

alrashdi

1

How to put a Scanner input into an array... for example a couple of numbers

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