C ++ _ULonglong变量在Visual Studio 2017中未定义

Question

问题发生在“ _ULonglong”。它返回一个错误，指出它是未定义的。 Kinda在这个问题上停留了一段时间。

void clothes_adding(string type,string description,int quantity,string 
colour,string size,double price)
{

int location=0; //1= found the location for adding the clothes
number_Clothes=number_Clothes+1; //increase the number of item in the system 
by 1

//create a new template and putting all the data

newnode=new clothes();
newnode->id= "C00"+ to_string((_ULonglong)number_Clothes);
newnode->type=type;
newnode->description=description;
newnode->quantity=quantity;
newnode->colour=colour;
newnode->size=size;
newnode->price=price;
newnode->next=NULL;
newnode->back=NULL;

附带的库（例如“ climits”和“ windows.h”）有助于解决问题。