bash - function declaration like C? [duplicate]

Is it possible to declare functions in bash like in C ?
Functions can get quite big so i don't want to define them at the beginning of the script.
For example:

#!/bin/bash

#Variable definition
myVar='Hello World'

#function declaration       <-- is this possible if yes how ?
function greeting() {}     


#main code
greeting


#function definition
function greeting() {
   echo $myVar
}