当我执行以下 C 代码片段时,我收到以下错误:
“box.c:2:23: error: 'fblog' undeclared (first use in this function) box.c:2:23: note: 每个未声明的标识符对于它出现的每个函数只报告一次”
我不得不承认我对 C 的经验很少,但我希望有人能发现问题。
我试图将 fblog 定义为 unsigned short 但这只是引发了另一个错误?!
void putpixel(int x, int y, unsigned short color) {
unsigned short *fblog;
unsigned short *fb = fblog;
*(fb + (y * 240) + x) = color;
}
void drawbox(void) {
int x, y;
for (x = 40; x <= 200; x++) {
putpixel(x, 30, 0xF800);
putpixel(x, 290, 0x001F);
}
for (y = 30; y <= 290; y++) {
putpixel(40, y, 0x7E0);
putpixel(200, y, 0x07E0);
}
}
void main(){
drawbox();
}