c++ - 无法在变量名称中放置空格 - Visual Studio 2015 (C++)

Question

我正在为在 Visual Studio 2015 中使用 C++ 制作收据做一些非常基本的编码。我无法在不被迫使用下划线的情况下创建带空格的名称(例如，Item 1 与 Item_1)。我觉得这是一个简单的修复，但我对整个编码非常陌生。

或者如果有任何输出(收据)显示 Item 1 而不是 Item_1。

这是我当前的代码:

#include "stdafx.h"
#include <iostream>

using namespace std;


int main()
{
    double Item_1;
    double Item_2;
    double Item_3;
    double Total;

    Item_1 = 2.50;
    Item_2 = 0.75;
    Item_3 = 12.98;
    Total = Item_1 + Item_2 + Item_3;

    cout << "Thank you for shopping at StuffMart" << endl;
    cout << "Item_1 = " << Item_1 << endl; 
    cout << "Item_2 = " << Item_2 << endl;
    cout << "Item_3 = " << Item_3 << endl;
    cout << "Total = " << Total << endl;

    system("pause");
    return 0;
}

Answer 1

来自菲律宾共产党 language reference documenation :

An identifier is an arbitrarily long sequence of digits, underscores, lowercase and uppercase Latin letters, and most Unicode characters (see below for details). A valid identifier must begin with a non-digit character (Latin letter, underscore, or Unicode non-digit character). Identifiers are case-sensitive (lowercase and uppercase letters are distinct), and every character is significant.

总而言之，标识符(即变量名、函数名、类名等)中不能有空格。空格用于帮助分隔构成语言的标记。