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

using namespace std;

void functionB() {
}

void functionC(); // forward declaration
void functionD(); // forward declaration

int main() {
    const char *lang = "C++";
    std::cout << "Hello and welcome to " << lang << "!\n";

    for (int i = 1; i <= 5; i++) {
        std::cout << "i = " << i << std::endl;
    }

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

    // byte b;
    short s;
    int i;
    long l;
    long long ll;

    cout << "size of short: " << sizeof(s) << endl;
    cout << "size of int: " << sizeof(i) << endl;
    cout << "size of long: " << sizeof(l) << endl;
    cout << "size of long long: " << sizeof(ll) << endl;

    return 0;
}

void functionA() {
}

void functionD() {}