Question

• Code in Java
• Write a recursive method smallestNumber which takes an ArrayList of Integers as input and returns the smallest number in the array. You can use a helper method if needed.
• Write a main method that asks the user for a series of numbers, until the user enters a period. Main should create an ArrayList of these Integers and call smallestNumber to find the smallest number and print it.

Input Format

A series of integers

Constraints

None

Output Format

The smallest number

Sample Input 0

1
10
6
4
-5
-4
0
.

Sample Output 0

Enter a series of integers, each on a different line. When done, enter a period.
-5

Sample Input 1

100
12
89
66
.

Sample Output 1

Enter a series of integers, each on a different line. When done, enter a period.
12

Answer 1

import java.util.ArrayList;
import java.util.Scanner;

public class MinRec {
        public static void main(String[] args) {
                System.out.println("Enter a series of integers, each on a different line. When done, enter a period.");
                Scanner sc = new Scanner(System.in);
                ArrayList<Integer> list = new ArrayList<>();
                while (sc.hasNextInt()) {
                        list.add(sc.nextInt());
                }
                int smallest = getSmallest(list);
                System.out.println(smallest);
        }

        private static int getSmallest(ArrayList<Integer> list) {
                return getMin(list, list.size());
        }

        private static int getMin(ArrayList<Integer> list, int n) {
                if (n == 1)
                        return list.get(0);

                return Math.min(list.get(n - 1), getMin(list, n - 1));
        }

}

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