Tim Varley Tim Varley

Euler 001 ruby Solution

Multiples of 3 and 5
Nov 2, 2015
3 minute read

Problem

https://projecteuler.net/problem=1

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 1000.

Answer: 233168

Solution

euler001.rb

#!/usr/bin/env ruby
def euler001_solution
  sum = 0
  (0..999).each do |num|
    sum += num if (num % 3 == 0) || (num % 5 == 0)
  end
  sum
end

puts euler001_solution if __FILE__ == $PROGRAM_NAME

See Also

# cpp go java php ruby rust javascript
1
2
3  
4    
5    
6      
7          
8          
9          
10          
11          
12          
# cpp ruby
13
14
15
16
17
18
19
20  
21  
22  
23  
24