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| #! /bin/env ruby | |
| def isbn(inp) | |
| switch=true | |
| sum=0 | |
| inp.to_s.split('').each do |i| | |
| if switch | |
| sum=sum+i.to_i | |
| switch=false | |
| else | |
| sum=sum+(i.to_i)*3 | |
| switch=true | |
| end | |
| end | |
| puts sum%10 > 0 ? (inp*10)+10-(sum%10) : inp*10 | |
| end | |
| isbn(978014300723) | |
| isbn(978014300763) |
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