#include "functions.h"

void functionB() {} // declared & defined
void functionC(); // declare
void functionD(); // declare

int main()
{
	//functionA(); // compiler error, because function is declared & defined after this call
	functionB(); // no error
	//functionC(); // linker error, because function is declared, but not defined
	functionD(); // no error
	functionE(); // no error

	return 0;
}

void functionA() {} // declare & defined

void functionD() {} // defined