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copied!<p>In your specific case, you can calculate the divisor. See <a href="https://stackoverflow.com/a/14495597/676874">Dnyans answer</a>.</p> <p>If you have a similar problem and you can't calculate the result, but want to avoid the <code>if</code>-<code>elsif</code> structure, then you could use <code>case</code>:</p> <pre><code>case number when 0...100 divisor = 10 when 100...1000 divisor = 100 when 1000...1000000 # 1 million divisor = 1000 when 1000000...1000000000 # 1 billion divisor = 1000000 when 1000000000...1000000000000 # 1 trillion divisor = 1000000000 # Keep goin... else end </code></pre> <p>To implement the <code>< 100</code> is a bit <a href="https://stackoverflow.com/questions/5778295/how-to-express-infinity-in-ruby">more complex</a>:</p> <pre><code>NegativeInfinity = -1.0/0.0 case number when NegativeInfinity...100 divisor = 10 when 100...1000 divisor = 100 when 1000...1000000 # 1 million divisor = 1000 when 1000000...1000000000 # 1 billion divisor = 1000000 when 1000000000...1000000000000 # 1 trillion divisor = 1000000000 # Keep goin... else end </code></pre> <p>If you want to avoid to assign <code>divisor</code> each time, you could use the result of the <code>case</code>-command:</p> <pre><code>divisor = case number when NegativeInfinity...100 10 when 100...1000 100 when 1000...1000000 # 1 million 1000 when 1000000...1000000000 # 1 billion 1000000 when 1000000000...1000000000000 # 1 trillion 1000000000 # Keep goin... else end </code></pre> <p>And combined with <a href="https://stackoverflow.com/a/14496809/676874">sawas answer</a> you can make it for all values:</p> <pre><code>divisor = case number when 0...100 10 when 100...1000 100 else (10 ** (Math.log10(number).to_i / 3 * 3)) end </code></pre>

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