Coping with Accelerated c++

[rajroshi]

This book is not a easy go.
I am in chapter 4.3 and trying to compile median.cc which has included header median.h. It was actually a function in a grading program, which I was using to get the median of a vector<double> and according to book I am writing it in a separate file and trying to compile it. As a function inside the grade program it was working fine.


median.cc code is below.

// source file for the median function

#include <vector> // to get the declaration of vector
#include <algorithm>   // to get the declaration of sort
#include <stdexcept>    // to get the declaration of domain_error
#include "median.h"


using std::domain_error;   using std::sort;   using std::vector;



// compute the median of a vector<double>
// note that calling this function copies the entire argument vector

double median(vector<double> vec)
{
    typedef vector<double>::size_type vec_sz;

    vec_sz size = vec.size();
    if (size == 0)
        throw domain_error("median of an empty vector");

    sort(vec.begin(), vec.end());

    vec_sz mid =  size / 2;

    return size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid];
}
double median(std::vector<double>);

and this is median.h

#ifndef GUARD_median_h
#define GUARD_median_h

// median.h—final version
#include <vector>
double median(std::vector<double>);

#endif

When I am trying to compile median.cc it giving me error
undefined references to '_WinMain@16'.
Most probably I am again doing silly mistake or something very funny, dunno.
Anyone has any idea or anyone else is using this book.

Thanx and Regards

[Denis]

This link error means that your project does not have main function.

[rajroshi]

@Denis
Thanx for the response. I've got the clue.

I'll have to put all files together and build project rather then compiling them individually. Am I right?

I've done it and it is ok working fine.

[Duthomhas]

The difference is in the type of application you are writing.

Your IDE thinks you are trying to write a Windows GUI application.

Make sure that when you start a new project, you choose a "Console Application" project.

Hope this helps.

[rajroshi]

@Duoas

In 4 chapters I have stuck twice and still many to go. So I will keep buzzing you guys.

Thanx for your help.