输出正常，输入有问题（全1）。

void fileOut() {
	FILE* fp = fopen("GRcd.txt", "wb");
	fprintf(fp, "%d\n", x);
	fclose(fp);
	return;
}

bool fileIn() {
	FILE* fp = fopen("GRcd.txt", "rb");
	if (fp != NULL) {
		int xx;
		xx = fscanf(fp, "%d", &xx);
		cout << xx << endl;
		fclose(fp);
	}else {
		fileOut();
		return 0;
	}
	return 1;
}