Behind The Scence With Functions?

i trying understand in simplest form of inside or made of predefine functions?

c++ tutorial not explain nor did find anythig on site.

example:

setup() function

void setup() {               
  // initialize digital pin output.
  pinmode(led, output);

where code setup() or pinmode(var1,va2)

this never described in detail anywhere?

any appreciated.  thanks.

quote

where code setup()

you write it.

quote

or pinmode()

all of source code available you. trick finding it. depends on board, 1 thing. code arm boards different avr boards.

on system, ide installed in c:\users\pauls\documents\arduino-<some version>, , pinmode() declared in hardware\arduino\avr\cores\arduino\arduino.h (relative install path) , implemented in wiring_digital.c in same directory.

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