How to put Scanner and size in an Array

Question

I wanted to have a program that can only calculate positive integers, and only have a size of 4.
Example1:
Input: 1 2 -5 6
Output: 9

Example2:
Input: 1 2 -5 6 3
Output: Error

Im quite new to array, so this is what I did so far:
https://code.sololearn.com/c4a2a7A15a1A

Answer 1

For taking numbers of input you have to decide the size of the array , you can ask user to give the size of array

int size = in.nextInt();

Then make an array of size given by user

int arr[] = new int[size];

By default the array arr contains all elements 0,

Now you have to change the elements by user input, use loop to do this

int sum = 0;
for (int i=0 ; i < size-1 ; i++) {
arr[i] = in.nextInt();
if (arr[i] > 0)
sum += arr[i];
}

Now if the number will be positive then it will be added to sum variable , and at last you can print sum.

System.out.println(sum);

Answer 2

You said that you are little bit confused in array?

An array is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created. After creation, its length is fixed. Each item in an array is called an element, and each element is accessed by its numerical index.

NOTE -
• You can't change the size of array it's always fixed

credit - oracle.com

Answer 3

Hi Brianna
I see Rishav Tiwari has given you a good answer already, but I will post mine also, so you may learn from different techniques.

// Created by Brianna

import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner input= new Scanner (System.in);
int my_array[] = new int [4];
int sum = 0;

for (int i =0; i <4; i++){
my_array[i] = input.nextInt();
if(my_array[i] >=0){
sum += my_array[i];
}
}

System.out.println(sum);
}
}

I would suggest you review your understanding of loops & array declarations