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sharmaabhinav/gist:7006263

Last active December 25, 2015 16:29
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gistfile1.txt
no = ARGV[0].to_i
copy_no = no
check_digit = 0
for i in 2..13
if i%2 !=0
check_digit = check_digit + (copy_no%10) * 1
else
check_digit = check_digit + (copy_no%10) * 3
end
copy_no = copy_no/10
end
check_digit = 10 - check_digit%10
check_digit = 0 if check_digit == 10
no = no*10 + check_digit
puts no
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