title: For loop Increment with a step not working
body: <p>The following Go program fails  to compile </p>
  
  <pre><code>package main
  
  import (
  "fmt"
  )
  
  func main() {
  var celcius int
  for i := 0; i &lt;= 300; i + 20 {
      celcius = 5 * (i - 32) / 9
      fmt.Printf("%d \t %d\t \n", i, celcius)
  }
  }
  </code></pre>
  
  <p>The Error message is "i + 20 evaluated but not used" .  How to give a step increment in golang for loop</p>