c++ - Visual C++ 不允许 iostream

Question

我刚开始使用 C++ 我正在阅读电子书从 C++ 开始第 7 版。我从书中复制了代码并将其放入带有预编译头文件的新项目 w32 控制台应用程序下的 Visual 中。好吧，当我在预处理器指令行中使用 iostream 时，我得到...我四处搜索但不明白为什么 iostream 不起作用，有什么帮助吗？

1>------ Build started: Project: dd, Configuration: Debug Win32 ------
1>  stdafx.cpp 1>  dd.cpp 1>c:\documents and settings\leon\my documents\visual studio 2010\projects\dd\dd\dd.cpp(24): fatal error
C1010: unexpected end of file while looking for precompiled header.
Did you forget to add '#include "StdAfx.h"' to your source?
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

    1 // This program calculates the user's pay.
    2 #include <iostream>
    3 using namespace std;
    4
    5 int main()
    6 {
    7 double hours, rate, pay;
    8
    9 // Get the number of hours worked.
    10 cout << "How many hours did you work? ";
    11 cin >> hours;
    12
    13 // Get the hourly pay rate.
    14 cout << "How much do you get paid per hour? ";
    15 cin >> rate;
    16
    17 // Calculate the pay.
    18 pay = hours * rate;
    19
    20 // Display the pay.
    21 cout << "You have earned $" << pay << endl;
    22 return 0;
    23 }

Answer 1

不是因为iostream，而是因为你忘了包含stdafx.h。

错误很明显。如果您使用预编译 header 构建项目，则必须在实现文件的开头包含 stdafx.h。