1.cpp

//In main...
    SDL_Texture *image = nullptr;
    try {
        image = LoadImage("../res/Lesson4/image.png");
    }
    catch (const std::runtime_error &e){
        std::cout << e.what() << std::endl;
        return 4;
    }
    int iW, iH;
    SDL_QueryTexture(image, NULL, NULL, &iW, &iH);
    int x = SCREEN_WIDTH / 2 - iW / 2;
    int y = SCREEN_HEIGHT / 2 - iH / 2;

2.cpp

    SDL_Event e;

3.cpp

    bool quit = false;
    while (!quit){
        //Our main loop

4.cpp

        //Event polling
        while (SDL_PollEvent(&e)){
            //If user closes he window
            if (e.type == SDL_QUIT)
                quit = true;
            //If user presses any key
            if (e.type == SDL_KEYDOWN)
                quit = true;
            //If user clicks the mouse
            if (e.type == SDL_MOUSEBUTTONDOWN)
                quit = true;
        }

5.cpp

	//Rendering
        SDL_RenderClear(renderer);
        //Draw the image
        ApplySurface(x, y, image, renderer);

        //Update the screen
        SDL_RenderPresent(renderer);