ino vs cpp example

example.cpp

// cpp files require these includes
// ino files do not
#include <Arduino.h>
#include <Serial.h>

// cpp files require this predeclaration
// ino files do not
void sendMessage(void);

void setup(void)
{

}

void loop(void)
{
	sendMessage();
}

void sendMessage(void)
{
	Serial.println(F("Hello world"));
}

example.ino

void setup(void)
{

}

void loop(void)
{
	sendMessage();
}

void sendMessage(void)
{
	Serial.println(F("Hello world"));
}