Question

. Write a complete Java program that is to be used for a psychology study into random number choices by a human volunteer. Your program is to operate as follows. (Programs that correctly carry out some of the tasks will receive partial credit. Your program should not be more than 30 lines long.) Ask the user (the volunteer) to repeatedly type 2 digit numbers onto the screen. Read the user input and discard any number that is less than 10 or greater than 100, but keep track of numbers within this range. When the user enters the number 100 the experiment ends and the program prints a summary with the following form (with one line of output for each of the numbers from 10 to 99 that was used):

User chose 10 for 2.1% of choices.

User chose 12 for 0.7% of choices.

User chose 16 for .

Answer 1

// TEXT CODE

import java.util.Scanner;

public class PsychologyStudy {
    public static void main(String[] args) {

        int[] arr = new int[90];      // value at index = 0 store count of 10 and so on..
        Scanner scanner = new Scanner(System.in);
        int choiceCounter = 0;  // stores how many correct choices entered

        while (true) {
            System.out.print("Enter two digit number or enter 100 to end the experiment: ");
            int n = scanner.nextInt();
            if (n == 100) break;
            else {
                arr[n - 10]++;         // increment the count for corresponding number
                choiceCounter++;
            }
        }
        // now print the summary for used choices
        System.out.println("\n...................Summary................\n");
        if (choiceCounter != 0){
            for (int i = 0; i < arr.length; i++) {
                if (arr[i] != 0)
                    System.out.printf("User chose %d for %1.1f%% of choices.\n", (i + 10), ((float)(arr[i] * 100) / choiceCounter));     // print number and percentage
            }
        } else System.out.println("Zero valid choices entered");
    }
}

// SCRENNSHOTS

// CODE

// TEST CASE