Problem of the Day

Friday, December 19, 2025

Problem:

The String Array students holds the names of a series of students who are seated in order in a single line in a classroom.

String[] students = {"Aaron", "Bobby", "Caroline", "Darlene"};

... for example, represents four students seated left-to-right in the classroom.

A teacher want to make sure that he works with every student once before seeing any student twice. What does the following code segment do?

int i = 0;
while (true)
{
    System.out.println("Work with " + students[i]);
    i = (i + 1) % students.length;
}

Goes through the list of students once from left-to-right
Goes through the list of students once from right-to-left
Repeatedly goes through the list of student from left-to-right
Repeatedly goes through the list of students from right-to-left

Show solution:

The correct answer is c. The index variable i starts at 0, and is incremented repeatedly in the infinite while loop, with a modulo operator % that resets the index to 0 after reaching the end of the list.