Created
September 6, 2012 20:44
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Ethiopian Multiplication
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| # Ethiopian Multiplication | |
| # usage: ruby em.rb 673 7 | |
| m, n = ARGV.map(&:to_i) | |
| product = 0 | |
| while m >= 1 | |
| puts "%4d : %4d %s" % [m, n, m.even? ? "Ignore" : ""] | |
| product += n unless m.even? | |
| m = m / 2 | |
| n = n * 2 | |
| end | |
| puts "Product: #{product}" |
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Example of output:
673 : 7
336 : 14 Ignore
168 : 28 Ignore
84 : 56 Ignore
42 : 112 Ignore
21 : 224
10 : 448 Ignore
5 : 896
2 : 1792 Ignore
1 : 3584
Product: 4711