mostsignificant

I welcome any visitors, I’m a staple in the home 
My day starts in the evening and as an after-work throne
When most of time used in a horizontal state, so 
You can always count on me when feeling like a po-ta-to

mostsignificant

Though I am with you all night long you leave me in the morning 
It doesn’t give me much surprise, a tune plays as a warning
You use two of me, arranged during well-defined routines
Nearest when you’re resting and closest in your dreams

mostsignificant

I come with you to many places on trips and during travel
In civilised territory: I don’t like soil, I don’t like gravel 
Thanks to physics, power and transmission 
I help you undertake an expedition sans emission

mostsignificant

You fill me up with water, but never take a sip 
I am a great companion when the climate starts to dip 
I’m useless when I’m empty and unsafe when too hot 
And as time slowly passes by my energy is lost

mostsignificant

I’m much longer than I am wide, so flat when I’m awake 
But curled up tight and on my side when I can take a break 
I help you reach your very goals, support you from the ground 
It’s funny how each time you work I’m always lying down! 

mostsignificant

(1) int main(void) { /* ... */ }
(2) int main(int argc, char *argv[]) { /* ... */ }

mostsignificant

#include <algorithm>
#include <iostream>

int main(int argc, char *argv[]) {
    std::copy(argv, argv + argc, std::ostream_iterator<char *>(std::cout, "\n"));
    // ...
}

mostsignificant

(3) int main(int argc, char *argv[], char *envp[]) { /* ... */ }

mostsignificant

if (argc < 2) {
    std::cerr << "dog: missing input file!\n";
    std::cerr << "usage: dog <input_file> ...\n";
    return EXIT_FAILURE;
}

mostsignificant

for (auto i = 1; i < argc; ++i) {
    std::ifstream input_file(argv[i], std::ios::in);
    if (!input_file.is_open()) {
        std::cerr << "dog: could not open input file '" << argv[i] << "'!\n";
        return EXIT_FAILURE;
    }
    // ...
}