SDL2 C demo adapted for Visual C++ 2015

#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <cstring>

#include "SDL.h"

// Get a random number between 0 and 255
int randCol()
{
	return rand() % 255 + 0;
}

int main(int argc, char** argv)
{
	// Initialize the random number generator
	srand(time(NULL));

	// Initialize SDL
	SDL_Init(SDL_INIT_VIDEO);

	// Open a 800x600 window and define an accelerated renderer
	SDL_Window* window = SDL_CreateWindow("SDL2 & Code::Blocks", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
		800, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
	SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);

	// Initial renderer color
	SDL_SetRenderDrawColor(renderer, randCol(), randCol(), randCol(), 255);

	bool running = true;
	Uint32 old_time = 0, change_color_time = 1000, new_time;
	SDL_Event event;
	while (running)
	{
		// Check for various events (keyboard, mouse, touch, close)
		while (SDL_PollEvent(&event))
		{
			if (event.type == SDL_KEYDOWN)
			{
				const char* key = SDL_GetKeyName(event.key.keysym.sym);
				if (strcmp(key, "Q") == 0 || strcmp(key, "Escape") == 0)
				{
					running = false;
				}
			}
			else if (event.type == SDL_QUIT)
			{
				running = false;
			}
		}

		// Clear buffer
		SDL_RenderClear(renderer);

		// Draw here ...

		// Switch buffers
		SDL_RenderPresent(renderer);

		new_time = SDL_GetTicks();
		if (new_time - old_time > change_color_time)
		{
			SDL_SetRenderDrawColor(renderer, randCol(), randCol(), randCol(), 255);
			old_time = new_time;
		}
	}

	// Release any of the allocated resources
	SDL_DestroyRenderer(renderer);
	SDL_DestroyWindow(window);
	SDL_Quit();

	return 0;
}