Fix Euler Problem 1 (#467)

* refactor code to ES6 styling, fixed incorrect code and broken input in Problem 1

* standard styling

* use standard

* removed changes to Problem 2

* added URL to euler problem

Author: victorialo

Project-Euler/Problem1.js

@@ -1,18 +1,27 @@
+// https://projecteuler.net/problem=1
 /*    Multiples of 3 and 5
     If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below the provided parameter value number.
 */
 
-function multiplesThreeAndFive (num) {
+const readline = require('readline')
+
+const multiplesThreeAndFive = (num) => {
   let total = 0
   // total for calculating the sum
-  for (let i = 0; i <= num; i++) {
+  for (let i = 0; i < num; i++) {
     if (i % 3 === 0 || i % 5 === 0) {
       total += i
     }
   }
   return total
 }
 
-var num = console.log('Enter a number: ')
-console.log(multiplesThreeAndFive(num)) // multiples3_5 function to calculate the sum of multiples of 3 and 5 within num
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+})
+rl.question('Enter a number: ', function (num) {
+  console.log(multiplesThreeAndFive(num)) // multiples3_5 function to calculate the sum of multiples of 3 and 5 within num
+  rl.close()
+})