Project wont compile when I place functions below function calls I use VSCode, not the Arduino IDE. I saw and tried to use a lot of code snippets which are provided for Arduino projects...

So when I copy/paste these examples into my VSCode and try to compile it fails. (I won't believe that people offer non-working examples.) 

When I place the functions above the function calls it compiles.

Is this normal behavior or do I have to add some settings to get this working as provided?

Fails in VSCode (works in Arduino IDE):

#include "Arduino.h"
void setup() {
}
int zero = 0;

void loop() {
  zero = myfunction();
}

int myfunction(){
  return 0;
}


Works in VSCode (Works in Arduino IDE):

#include "Arduino.h"

void setup() {
}
int zero = 0;

int myfunction(){
  return 0;
}

void loop() {
  zero = myfunction();
}
You need to declare your function before you use it.  So either the whole function body needs to be before the usage, or you must add a function prototype declaration.

void myfunction();

myfunction();

void myfunction(){
  return 0;
}