C++编程的问题

Question

我有这个下面的文件.我试图在visual studio 2010中运行它.但是它一直给我一个错误,说我需要包含头文件stdafx.h.但是这个文件在头文件列表中无处可见.

#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;


int choice();
double cylinder_volume();
double cone_volume();
double sphere_volume();
void display_result(double volume);

int main ()
{
int option;
double volume;

option=choice();
if (option==1)
    {
        volume=cylinder_volume();
        display_result(volume);
    }
else
    if (option==2)
    {
        volume=cone_volume();
        display_result(volume);
    }
else
    if (option==3)
    {
        volume=sphere_volume();
        display_result(volume);
    }
return 0;
}

int choice()
{
    int option;
    cout<<"What would you like to calculate the volume of: ";
    cout<<"\nPress 1 for cylinder. ";
    cout<<"\nPress 2 for cone. ";
    cout<<"\nPress 3 for sphere. ";
    cin>>option;
    return option;
}
double cylinder_volume()
{
    const double pi=3.14159;
    double height,radius,volume;
    cout<<"Enter the height of the cylinder: ";
    cin>>height;
    cout<<"\nEnter the radius of the cylinder: ";
    cin>>radius;
    volume=pi*radius*radius*height;
    return volume;
}

double cone_volume()
{
    const double pi=3.14159;
    double height,radius,volume;
    cout<<"Enter the height of the cone: ";
    cin>>height;
    cout<<"\nEnter the radius of the cone: ";
    cin>>radius;
    volume=(1/3)*pi*radius*radius*height;
    return volume;
}

double sphere_volume()
{
    const double pi=3.14159;
    double radius,volume;
    cout<<"\nEnter the radius of the sphere: ";
    cin>>radius;
    volume=(4/3)*pi*radius*radius*radius;
    return volume;
}

void display_result(double volume)
{
    cout<<volume;
}

Answer 1

这是因为msvc默认使用预编译头,它的名字叫"stdafx.h".您应该转到"Project-> Properties"然后转到"C++ - > Precompiled header"并选择"Not using precompiled headers".下次创建新项目时,可能需要取消选中项目创建向导中的"使用预编译头"复选框.