week 3 class practice

w3.java

package comp608.assignment1;
import static java.lang.System.out;
import java.util.*;


public class Main {
	private static final Scanner input = new Scanner(System.in);
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
    String s1 = input.nextLine();
    out.println(s1 == "h");
		//validateNumberInRange();
		//validateDiscreteStringValues();
		readMultipleInputWithLoop();
	}
	
	public static void readMultipleInputWithLoop() {
		int size = 0;
		while(size < 1) {
			out.print("How many numbers to enter? ");
			size = input.nextInt();
			if(size < 1) {
				out.println("Invalid. Try agian.");
			}
		}
		
		double total = 0;
		double val;
		int counter = 1;
		while(size > 0) {
			out.printf("Enter value #%d: ", counter++);
			val = input.nextDouble();
			total = total + val;
			size--;
		}
		out.printf("Total is %-10.2f\n", total);
	}
	
	public static void validateDiscreteStringValues( ) {
		String val;
		while(true) {
			out.print("Are you hungry(yes/no)? ");
			val = input.nextLine();
			if(val.equalsIgnoreCase("yes")) {
				actionsYes();
				break;
			} else if(val.equalsIgnoreCase("no")) {
				actionsNo();
				break;
			} else {
				out.printf("Invalid: %s, enter yes/no.\n", val);
			}
		}
	}
	
	public static void actionsNo() {
		out.println("Actions to take for no.");
	}
	
	public static void actionsYes() {
		out.println("Actions to take for yes.");
	}
	public static void validateNumberInRange() {
		double num; // store user input
		while(true) {
			out.print("Enter a number(10-20 incl.): ");
			num = input.nextDouble();
			if(num >= 10 && num <= 20 )
				break;
			else
				out.printf("Input %f is invalid.\n", num);
		}
		
		out.printf("Make use of user input here: %.0f\n", num);
	}

}