#include <iostream>
#include "functions.h"

using namespace std;

void functionB() {}
void functionC(); // forward declaration
void functionD(); // forward declaration

int main() {
    std::cout << "Hello, World!" << std::endl;

    // functionA(); // compiler error - functionA is defined after call
    functionB(); // no error - functionB is defined before call
    // functionC(); // linker error - functionC is declared but not defined
    functionD(); // no error - functionD is declared and defined
    functionE();
    // functionF(); // linker error - functionF is defined twice

    byte b;
    int8_t b2;
    short s;
    int i;
    long l;
    long long ll;

    cout << "size of short: " << sizeof(short) << endl;
    cout << "size of int: " << sizeof(int) << endl;
    cout << "size of long: " << sizeof(long) << endl;
    cout << "size of long long: " << sizeof(long long) << endl;

    return 0;
}

void functionA() {}
void functionD() {}