a.cpp

int main(int argc, char** argv){
    if (SDL_Init(SDL_INIT_EVERYTHING) == -1){
        std::cout << SDL_GetError() << std::endl;
        return 1;
    }

b.cpp

    SDL_Window *win = nullptr;
    win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN);
    if (win == nullptr){
        std::cout << SDL_GetError() << std::endl;
        return 1;
    }

c.cpp

    SDL_Renderer *ren = nullptr;
    ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
    if (ren == nullptr){
        std::cout << SDL_GetError() << std::endl;
        return 1;
    }

d.cpp

    SDL_Surface *bmp = nullptr;
    bmp = SDL_LoadBMP("../res/Lesson1/hello.bmp");
    if (bmp == nullptr){
        std::cout << SDL_GetError() << std::endl;
        return 1;
    }

e.cpp

    SDL_Texture *tex = nullptr;
    tex = SDL_CreateTextureFromSurface(ren, bmp);
    SDL_FreeSurface(bmp);

f.cpp

    SDL_RenderClear(ren);
    SDL_RenderCopy(ren, tex, NULL, NULL);
    SDL_RenderPresent(ren);

g.cpp

    SDL_Delay(2000);

h.cpp

    SDL_DestroyTexture(tex);
    SDL_DestroyRenderer(ren);
    SDL_DestroyWindow(win);

i.cpp

    SDL_Quit();
    return 0;
}