int SDL_RenderDrawLines(SDL_Renderer*    renderer,
                        const SDL_Point* points,
                        int              count)

#include "SDL.h"

#define POINTS_COUNT 4

static SDL_Point points[POINTS_COUNT] =
{
    {320, 200},
    {300, 240},
    {340, 240},
    {320, 200}
};

int main(int argc, char* argv[])
{
    if (SDL_Init(SDL_INIT_VIDEO) == 0)
    {
        SDL_Window* window = NULL;
        SDL_Renderer* renderer = NULL;

        if (SDL_CreateWindowAndRenderer(640, 480, 0, &window, &renderer) == 0)
        {
            SDL_bool done = SDL_FALSE;

            while (!done)
            {
                SDL_Event event;

                SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
                SDL_RenderClear(renderer);

                SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
                SDL_RenderDrawLines(renderer, points, POINTS_COUNT);
                SDL_RenderPresent(renderer);

                while (SDL_PollEvent(&event))
                {
                    if (event.type == SDL_QUIT)
                    {
                        done = SDL_TRUE;
                    }
                }
            }
        }

        if (renderer)
        {
            SDL_DestroyRenderer(renderer);
        }
        if (window)
        {
            SDL_DestroyWindow(window);
        }
    }
    SDL_Quit();
    return 0;
}