macro/appendixes/negative.html

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<h1>Note on negative integer constants</h1>

<p>
Using a negative integer constant may cause a problem like the following: For example,
</p>

<pre><code>for i -10 0</code></pre>

<p>
causes the syntax error, because the second parameter is regarded as "i-10" instead of "i". To avoid this problem, take one of the following solutions:
</p>

<ol>
  <li>Put "0" before "-".
<pre><code>for i 0-10 0</code></pre>
  </li>

  <li>Assign the negative constant to a variable.
<pre><code>A = -10
for i A 0
</code></pre>
  </li>
</ol>

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