如何在sdl2中使用方法在按键时移动矩形

#include <SDL2/SDL.h>

int main() {
    SDL_Init(SDL_INIT_VIDEO);

    SDL_Window* window = SDL_CreateWindow("Moving Rectangle", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, 0);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);

    SDL_Rect rect = { 100, 100, 50, 50 };

    bool quit = false;
    SDL_Event event;

    while (!quit) {
        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT) {
                quit = true;
            }
            else if (event.type == SDL_KEYDOWN) {
                switch (event.key.keysym.sym) {
                    case SDLK_UP:
                        rect.y -= 10;
                        break;
                    case SDLK_DOWN:
                        rect.y += 10;
                        break;
                    case SDLK_LEFT:
                        rect.x -= 10;
                        break;
                    case SDLK_RIGHT:
                        rect.x += 10;
                        break;
                    default:
                        break;
                }
            }
        }

        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderClear(renderer);
        SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
        SDL_RenderFillRect(renderer, &rect);
        SDL_RenderPresent(renderer);
    }

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}