Auto-indent in Notepad++

We always write code like this formal:

void main(){
  if(){
    if()
    }

But when I use Notepad++, the display is:

void main(){
if(){
if()
}

How do I use Notepad++ to auto indent?

Thanks to Jonathan, I have set it, but it does not take any effect. The snapshot is below:

I am using Notepad++ version 5.1.3.

Solution 1:

Notepad++ will only auto-insert subsequent indents if you manually indent the first line in a block; otherwise you can re-indent your code after the fact using TextFX > TextFX Edit > Reindent C++ code.

Solution 2:

If the TextFX menu does not exist, you need to download & install the plugin. Plugins->Plugin Manager->Show Plugin Manager and then check the plugin TextFX Characters. Click 'install,' restart Notepad++.

In version Notepad++ v6.1.3, I resolve with: Plugin Manager->Show Plugin Manager** and then check the plugin "Indent By Fold"

Solution 3:

There seems to be an option for auto-format of XML at least. It can be found at TextFX -> TextFX HTML Tidy -> Tidy: reindent XML.