How can I store user inputs in an array of integers?

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I do not know how many numbers the user will input, and I need the program to stop inserting the numbers in the array when it reaches the end of the line, because in the new line the user will input a number that is not related to this.

For exemple:

The user could input:

1 5 7 8 9 5

4

or:

5 4 8 9 4 2 1 3 2 4

7

The array I need would be, for exemple 1: [1, 5, 7, 8, 9, 5]

If your requirement allows you to ask the user, you can do it as follows:

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int[] num;
        Scanner scanner=new Scanner(System.in);
        System.out.print("How many integers you want to enter: ");
        int n = 0;
        if(scanner.hasNextInt()) {
            n=scanner.nextInt();
        }
        num=new int[n];
        for(int i=0;i<n;i++) {
            System.out.printf("Enter integer %d: ",i+1);
            if(scanner.hasNextInt()) {
                num[i]=scanner.nextInt();
            }           
        }
        System.out.println(Arrays.toString(num));
    }
}

A sample run:

How many integers you want to enter: 3
Enter integer 1: 10
Enter integer 2: 15
Enter integer 3: 20
[10, 15, 20]

You can also do it as follows:

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int[] num;
        Scanner scanner = new Scanner(System.in);
        System.out.print("How many integers you want to enter: ");
        int n = 0;
        if (scanner.hasNextInt()) {
            n = scanner.nextInt();
            scanner.nextLine();
        }
        num = new int[n];
        System.out.print("Enter the integers separated by a space: ");
        String[] strNums = null;
        if (scanner.hasNextLine()) {
            strNums = scanner.nextLine().split(" ");
        }
        if (strNums != null) {
            for (int i = 0; i < n; i++) {
                try {
                    num[i] = Integer.parseInt(strNums[i]);
                } catch (Exception e) {
                    System.out.println("Invalid input");
                    break;
                }
            }
            System.out.println(Arrays.toString(num));
        }
    }
}

A sample run:

How many integers you want to enter: 3
Enter the integers separated by a space: 10 15 20    
[10, 15, 20]

However, if you want the number of integers to be unrestricted, you should use a List instead of an array (as the size of an array is fixed at the time of initialization) as follows:

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        List <Integer> intList=new ArrayList<Integer>();
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the integers separated by a space: ");
        String[] strNums = null;
        if (scanner.hasNextLine()) {
            strNums = scanner.nextLine().split(" ");
        }
        if (strNums != null) {
            for (String strNum: strNums) {
                try {
                    intList.add(Integer.parseInt(strNum.trim()));
                } catch (Exception e) {
                    System.out.println("Invalid input");
                    break;
                }
            }
            System.out.println(intList);

            //You can even get an array out of the list as follows:
            Integer[] nums = intList.toArray(new Integer[0]);
            System.out.println(Arrays.toString(nums));
        }
    }
}

A sample run:

Enter the integers separated by a space: 10 20 30 40
[10, 20, 30, 40]
[10, 20, 30, 40]

Wish you all the best!

How can I store user inputs in an array of integers?, How do i store user input into an array of ints using java? I've finally decided to relearn java after completing school. We coded in C but everything� I want the xy_array to store two integers (x and y), i.e a coordinate. Look at it as a temporary array to siphon integers to the x_array and y_array. I want an array of x-coordinates and y-coordinates respectively. But the user must input the x-coordinate and y-coordinate as a single input. And they may input as many coordinates as they wish.

You can use List to save the numbers. If you really want an array type variable. You can create an array from the list.

    List<Integer> list = Arrays.asList(1,2,3,4,5);
    Integer[] array = list.toArray(new Integer[0]);

How do i store user input into an array of ints using java?, You just need an int to hold the number of entries already in the array(s) - initial value 0. This is also the correct index to use for the first available array element. array[0] = 10 array[1] = 20 array[2] = 30 array[9] = 100. Since array index is an integer value. Hence, rather hard-coding constant array index, you can use integer variable to represent index. For example, int i = 0; array[i] = 10; // Assigns 10 to first array element Program to input and print array elements

I agree you ought to ask the user about the size of the array as an array is static data structure. Use the linked list data structure.

java, This exercise involves Scanner object to read input into String object and then splitting it into Duration: 3:48 Posted: Mar 27, 2016 If you don't know how many numbers to store, you should use an ArrayList<Integer>instead of a int[].– azurefrogDec 19 '19 at 16:52 1 Arrays are not dynamic. This means that they are fixed in size at runtime.

Off the top of my head:

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String value = reader.readLine();
String[] strArr = value.split(" ");
int intArr[]= new int[strArr.length]; 
for(int i = 0; i < strArr.length; i++)
    intArr[i] = Integer.parseInt(strArr[i]);

LEARN JAVA How to store input values in array, Storing multiple user inputs in an array Hey, i suggest you to create class ' Team' having three int variables to store win,loss and draw number� It seems like you are just waiting for the user to give 10 inputs, for which a for-loop is better practice. If you were to be looping until, for example, the sum of the user inputs is becomes greater than a number, that would be a better use for a while-loop.

Storing multiple user inputs in an array (Beginning Java forum at , There is two way to storing values in an array in C#. Either you To store users input in an array, you need to use a loop to traverse array index position. int i;; int[] arr = new int[5]; // 5 size array; // Accepting value from user; for (i = 0; i < 5; i ++)� You will learn to declare, initialize and access elements of an array with the help of examples. An array is a variable that can store multiple values. For example, if you want to store 100 integers, you can create an array for it. int data ;

C# Storing value in Array, Step 4: Declare a new array and fill in the array by user input Request an integer from the user using the Scanner object and save it // // --> // Declare a int array� Use DevC++ to implement a program that can store and output 5 integers, where the user can input its value into an array named arrayValue. The program should implement the following: 1. Calculate the sum and average of the array.

Solved: For This Lab, You Will Create A Basic Array Of Num , Declare and create an int array with the number of days as its length. For each index in the array: Input the temperature from the user. Store the temperature in� Create an array of size 5 and initialize a counter variable named count to zero. Use the Scanner class for taking input. Run a for loop five times and take input in the array. Increase the count variable by one each time the user’s input is greater than 5.

Comments
  • What have you tried so far? Can you show us some code?
  • If you don't know how many numbers to store, you should use an ArrayList<Integer> instead of a int[].
  • Arrays are not dynamic. This means that they are fixed in size at runtime. This means that if you are not always asking the user for the same number of items then this is not the ideal data structure for your purpose. Look into java array lists.
  • I think the question asks specifically that the user does not input the amount of integers they are entering. In your answer you require the user to input that value. If we knew the number of values we wouldnt ask this question.
  • thanks, the third program that you posted made the job