learning sdl

#include <stdlib.h>

#include <SDL2/SDL.h>

#define WINDOW_WIDTH 600

int main(void) {
    SDL_Event event;
    SDL_Renderer *renderer;
    SDL_Window *window;
    int i, j,r,g,b;

    SDL_Init(SDL_INIT_VIDEO);
    SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_WIDTH, 0, &window, &renderer);
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
    SDL_RenderClear(renderer);
    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
    for (j = 0; j < WINDOW_WIDTH; ++j){    
	for (i = 0; i < WINDOW_WIDTH; ++i){
	
	        SDL_SetRenderDrawColor(renderer, i, 0, 0, 0);
	        SDL_RenderDrawPoint(renderer, i, j);
	}
    }

    SDL_RenderPresent(renderer);
    while (1) {
        if (SDL_PollEvent(&event) && event.type == SDL_QUIT)
            break;
    }
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return EXIT_SUCCESS;
}