CS106A: Assignment 2.5

FindRange

/*
 * File: FindRange.java
 * Name: 
 * Section Leader: 
 * --------------------
 * This file is the starter file for the FindRange problem.
 */

import acm.program.*;

public class FindRange extends ConsoleProgram {
	
	private static final int SENTINEL = 0;
	
	public void run() {
		displayWelcomeMessage();
		findRange();
	}
	
	// displays welcome message
	private void displayWelcomeMessage() {
		println("This program displays the smallest and largest numbers.");
	}
	
	// takes user input and finds smallest and largest numbers
	private void findRange() {
		int firstNumber = readInt("?");
		// if first number entered is not equal to SENTINEL then program continues
		if (firstNumber != SENTINEL) {
			// initially, both the smallest and largest numbers are assigned the value of the first entered integer
			int smallestNumber = firstNumber;
			int largestNumber = firstNumber;
			while (true) {
				int value = readInt("?");
				// if the SENTINEL is entered then the program exits this code block
				if (value == SENTINEL) break;
				// if the smallest number is greater than the user input, it is assigned the value of the user input
				if (smallestNumber > value) {
					smallestNumber = value;
				}
				// if the largest number is smaller than the user input, it is assigned the value of the user input
				if (largestNumber < value) {
					largestNumber = value;
				}
			}
			println("smallest number: "+ smallestNumber +"");
			println("largest number: "+largestNumber+"");
		} else {
			// for special case when user inputs 0 as the first integer
			println("No values have been entered. (0 does not count!)");
			findRange();
		}
	}
}