(JAVA) Addition of integers in an Array

Question

I'm new to java programming so please excuse any misunderstandings or misinterpretations. I need to write a program with 2 methods, the first method declares an array of integers as shown and a variable that is the sum of this array then prints out the sum.

The second method is where my addition takes place. I've declared a variable "sum" equal to 0 so my addition can work, and a for loop that adds all integers based on the array length, returning the variable sum back to the main method. (From my current understanding of my program)

So far this does not work and I get 3 errors. One from my main method "cannot find symbol - inputArray" cannot find symbol in my for loop for "arr.length" and cannot find symbol in my " sum += arr[i]" Could someone please explain and possibly assist with why I am getting these errors. Thank you for your time.

public static void main(String[] args){
    int arr[] = {1,2,3,4,5};
    int sum = sumArray(inputArray);
    System.out.println("The sum is: "+sum);
}
public static int sumArray(int[] inputArray){
    int sum = 0;
    int i;
    for (i = 0; i < arr.length; i++){
        sum += arr[i];
        return sum;
    }   

}

add the return statement after end of for loop. for (i = 0; i < inputArray.length; i++){ sum += inputArray[i]; } return sum; — Aniket Sahrawat
– Aniket Sahrawat, Commented Mar 21, 2020 at 6:28

Andronicus · Accepted Answer · 2020-03-21 06:28:49Z

3

The variable name is inputArray. Also the return statement should be outside of the loop:

public static int sumArray(int[] inputArray){
    int sum = 0;
    for (int i = 0; i < inputArray.length; i++){
        sum += inputArray[i];
    }   
    return sum;
}

answered Mar 21, 2020 at 6:28

Andronicus

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Comments

saravana kumar · Accepted Answer · 2020-03-21 07:35:10Z

0

You can also use for each to find the sum. Find the code below

public static int sumArray(int[] arr){
    int sum = 0;
    for(int i:arr) {
        sum+=i;
    }
    return sum;   
}

answered Mar 21, 2020 at 7:35

saravana kumar

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Comments

Miki · Accepted Answer · 2020-03-21 08:20:23Z

0

Return statement should be outside of for loop. When the return statement is in the loop sumArray method returns the value of the first element of inputArray. Below I also added for each loop and replaced name arr with parameter name inputArray.

public static int sumArray(int[] inputArray){
int sum = 0;
for (int element : inputArray){
    sum += inputArray[i];
}
return sum;
}

answered Mar 21, 2020 at 8:20

Miki

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Comments

Yotam Levy · Accepted Answer · 2020-03-23 09:57:39Z

0

In java-8 you can use streams like this:

public static int sumArray(int[] arr) {
    int sum = IntStream.of(arr).sum();
    return sum;
}

Output: The sum is: 15.

It's in the package java.util.stream

edited Mar 23, 2020 at 9:57

answered Mar 21, 2020 at 17:14

Yotam Levy

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Comments

Y SAHITH · Accepted Answer · 2020-03-28 05:00:44Z

0

I think this should solve your problem:

public static void main(String[] args){
   int arr[] = {1,2,3,4,5};
   int sum = sumArray(arr);
   System.out.println("The sum is: "+ sum);
}

public static int sumArray(int[] inputArray){
   int sum = 0;
   for (int i = 0; i < inputArray.length; i++){
       sum += inputArray[i];
       return sum;
   }
}

answered Mar 28, 2020 at 5:00

Y SAHITH

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