title: What does for(;i<=m;i++) mean?
body: <p>I'm studying for my exam and I bumped into this example that has a line that says:</p>
  
  <pre><code>for(;i&lt;=m;i++)
  </code></pre>
  
  <p>The thing I don't understand is why is there a <code>;</code> with nothing in front of it?
  what does it do? What does it mean?</p>