How to sum elements of multiple arrays from a method (in Java)?

Question

I have a set of 1d arrays that are being pulled from a method (tableMethod) - i want to grab those 1d arrays, then sum all the elements in each 1d array. How can I do that?

I have two loops

one that can sum a 1d array by itself
another that can display all the 1d arrays

I'm having difficulty combining the for loops so that it can grab each 1d array, sum it, then move on to the next 1d array, sum it, and so forth

the result should look something like:

total: 391
total: 393
total: 3903
total: 39104

total: 39031 ... and so forth

  int sum = 0;
  int w = 0;
  int[] arrayOne = tableMethod(table, w);

  for (int k = 0; k < arrayOne.length; k++) {
      sum = sum + arrayOne[k];
  }
  for (int i = 0; i < arrayOne.length; i++) {
      System.out.println(Arrays.toString(tableMethod(table, i)));
  }
  System.out.println(sum);

}

Where is the “set of arrays”? You have only one int[] array. — Bohemian
– Bohemian ♦, Commented Oct 22, 2021 at 20:04
The set of arrays are in the method, the way I'm pulling them is by using table as the array and the "w" is the column numbers - so for example, i could call a tableMethod(table, 2) - which would pull the array then select the 2nd column — Prot0139
– Prot0139, Commented Oct 22, 2021 at 20:19

Rukshan Jayasekara · Accepted Answer · 2021-10-22 23:11:55Z

2

Something like this would work,

import java.util.stream.IntStream;

int n = <max value of w>
int sum = 0;

for (int i = 0; i < n; i++) {
   int[] array = tableMethod(table, i);
   int arr_sum = IntStream.of(array).sum();
   System.out.println(arr_sum); //single array sum

   sum += arr_sum;
}
System.out.println(sum); //total sum

edited Oct 22, 2021 at 23:11

answered Oct 22, 2021 at 20:42

Rukshan Jayasekara

1,9851 gold badge9 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Prot0139 Over a year ago

this is almost there! I had made a code similar to this. What I'm looking for is for the 1d arrays to be summed individually. The loop you provided sums the elements of first array, then adds the sum of the second array with the total of the first array, then the third array is summed with the total of the first and second array and so forth.

Prot0139 Over a year ago

If i have these 4 arrays: {1, 2, 3, 10, 3, 4, 7, 8, 9} {33, 34, 5, 6, 7, 91, 3, 49,10}, {43, 44, 45, 46, 47, 41, 49, 93,34} {10,10,10,10,10,10,10,10,10} I just want the loop to provide the sum of each one: 47 238 442 100

Nowhere Man · Accepted Answer · 2021-10-22 22:11:29Z

0

The code should be simply using nested loops (inner loop to calculate a sum may be replaced with stream):

int n = ... ; // a number of 1d arrays
int total = 0;
for (int i = 0; i < n; i++) {
    int[] arr = tableMethod(table, i);
    int sum = Arrays.stream(arr).sum();
    System.out.println(sum);
    total += sum;
}
System.out.println(total);

answered Oct 22, 2021 at 22:11

Nowhere Man

19.7k9 gold badges21 silver badges45 bronze badges

Collectives™ on Stack Overflow

How to sum elements of multiple arrays from a method (in Java)?

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related