Vim Auto-complete function

We all find that when writing code, sometimes it is possible to have more information for the variable name, and the name may be longer,

To use the variable name again, I find it seems to be unable to remember the previous VC 6.0, you can use a

Tool, nicknamed "Tomato", if it is in an environment such as VS, self-contained such an automatic hint, vi/vim such an environment

More trouble, the original recruit, today only found that in the input state of VIM, CTRL + P, will automatically complement the whole,

The principle seems to be that Vim remembers the words the user has entered. Here's a look at this example:

Look at the picture,

Defines a global variable, protvariable

Here to use this variable, if forgotten, but also defined at the head of the source file, a little bit of trouble,

When I enter into Pro,

Press the key combination: Ctrl + P

Hey, very good, very convenient,

Vim Auto-complete function