#c#sdl2 为什么这个函数不能调用？？求解

[三山三？]

重点是两个printf的地方，为什么可以输出1，不能输出2？？ #include"SDL.h" //一个BMP格式的图片自动向右下角 开始移动，碰到窗口之后，弹开 #include<stdio.h> #include<stdlib.h> #include<stdbool.h> int a = 1, b = 1; SDL_Rect rect;void aaBS(); int main(int argc,char* argv[]) { SDL_Init(SDL_INIT_VIDEO); SDL_Window* window = SDL_CreateWindow("automove", 100,100, 800, 600, SDL_WINDOW_SHOWN); SDL_Surface* surface = SDL_GetWindowSurface(window); SDL_Surface* mesurface = SDL_LoadBMP("me.bmp"); SDL_Renderer* rend = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED); SDL_Texture* me = SDL_CreateTextureFromSurface(rend,mesurface); SDL_Event event; SDL_RenderClear(rend); rect.x = 1; rect.y = 1; rect.h = mesurface->h; rect.w = mesurface->w; bool quit = false; while (quit == false) { while (SDL_PollEvent(&event)) { if (event.type == SDL_QUIT) { quit = true; } SDL_RenderClear(rend); void aaBS(); printf("1"); SDL_RenderCopy(rend, me, NULL, &rect); } SDL_Delay(5); SDL_RenderPresent(rend); } SDL_DestroyWindow(window); SDL_Quit; return 0;} void aaBS() { if (rect.x >= 780 || rect.x < 0) { a = a * (-1); } else if (rect.y >= 580 || rect.y < 0) { b = b * (-1); } rect.x = rect.x + a; rect.y = rect.y + b; printf("2");}