Answered: ow do I code this in java?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

How do I code this in java?

Testing Grades.sum(int[] arr, int firstIndex, int lastIndex) with valid indices

Test feedback: ***** Error ***** Grades.sum(int[] arr, int firstIndex, int lastIndex) returned an incorrect sum

Code:

public static int sum(int[] arr, int firstIndex, int lastIndex) {
int sum = 0;

if (firstIndex < 0 || lastIndex >= arr.length || firstIndex > lastIndex || firstIndex >= arr.length
|| lastIndex < 0) {
invalidIndexError(firstIndex, lastIndex, arr);
return -666;
} else {
sum = 0;
for (int i = firstIndex; i < lastIndex; i++) {
sum = sum + arr[i];
}
}
return sum;

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