33683

How to sum elements of a stack

Question:

import java.util.*; public class multiple { public static int userNumber; public static int userChoice; static Stack<Object> stack = new Stack<Object>(); static int[] list = new int[100]; public static void main(String[] args) { introduction(); multiple(); printStack(stack); } public static void introduction() { Scanner input = new Scanner(System.in); System.out.print("Welcome to the program, please enter the number less than 100 that you would like " + "to find whoes number \nbelow have muliples of 3 and 5: "); userNumber = input.nextInt(); System.out.println(); // System.out.println("Ok, now that youve entered," + userNumber + // " we will find out which numbers of you number are three and five. " // + // "would you like the result published as a:\n 1.alist \n 2.A sum of the result \n 3.Or both?"); // userChoice = input.nextInt(); // if (userChoice >=1 && userChoice <=3) // System.out.println( "The Computer will now program for" + // userChoice); // else // System.out.println("incorrect entry for menu. Please try again"); } public static void multiple() { for (int i = 1; i < userNumber; i++) { if (i % 3 == 0 || i % 5 == 0) { stack.push(i); } } } // public static addElementsofstac private static void printStack(Stack<Object> s) { if (s.isEmpty()) System.out.println("You have nothing in your stack"); else System.out.println(s); } }

I am trying to make a simple program that will take input for a user, find out the multiples of 3 & 5, then return the sum of the multiple. I have all the multiples discovered. I have a hunch that i need to convert the stack to an array. if so, would i just use stack.toArray()? then i would add them in a for loop?

Answer1:

Alternative without the need for intermediary counter variable:

int sum = 0; while (stack.size() > 0) sum += stack.pop();

Answer2:

Why would you need an array?

You just need to do something along the lines of:

int sum = 0; for(i=0;i<stack.size();i++){ sum = sum + stack.pop(); }

Though I agree with the others in that there's really no purpose of the stack itself.

EDIT: your clarification is only more confusing. How are 3, 6 and 9 multiples of 10? Are you talking about integers less than an inputted number that are multiples of 3 and 5?

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