C转C++

L.elem = new Book[MAXSIZE];    //C++
L.elem = (Book*)malloc(MAXSIZE * sizeof(Book));    //C

cout << "1.初始化n";    //C++
printf("1.初始化n");    //C

cin >> choose;
scanf("%d",&choose);

fstream file;
file.open("SqStack.txt");
if (!file) 
{
    cout << "错误！未找到文件！" << endl;
    exit(ERROR);
}
file >> head_1 >> head_2 >> head_3;
while (!file.eof())
{
    file >> L.elem[i].id >> L.elem[i].name >> L.elem[i].price;
    i++;
}
file.close();



FILE *fp;
fp = fopen("SqStack.txt","r+");
if (fp==NULL)
{
    printf("错误！未找到文件！n" );
    exit(ERROR);
}
while (!feof(fp))
{
	fgets(buf, 256, fp);
	s = buf;
	sscanf(s, "%s%s%lf", &L.elem[i].id, &L.elem[i].name, &L.elem[i].price);
	i++;
}
fclose(fp);