Can't find problem - long compilor error

line 50: You have to put a semicolon at the end of a class definition.

line 30: and is a keyword so you can't have variables with that name.

introducePerson() doesn't return a value.

line 61: You will have to overload operator>> to make it work with sexe objects.

Aug 12, 2012 at 1:07am

Thanks a lot for your help, but could you tell me how to overload the operator (I'm new to c++, that's why I'm on the beginner page)?

Aug 12, 2012 at 11:44am

std::istream& operator>>(std::istream& is, sexe& s)
{
	// Read data from is and use it to set s to the correct value.
	return is;
}

Last edited on Aug 12, 2012 at 11:44am

Aug 12, 2012 at 2:37pm

I still didn't understand how to overload the operator, but that is ok. I changed the code so that I don't need to oveload it (I think). This is what the code looks like now:

#include "StdAfx.h"
#include <iostream>
#include <string>
using namespace std;

class Human
{
private:
	string firstName;
	string lastName;
	char gender;
	int age;

public:
	Human(string fName = "", string lName = "", char sexe = 'f', int pAge = 0)
	{
		firstName = fName;
		lastName = lName;
		gender = sexe;
		age = pAge;
	}

	int introducePerson()
	{
		string extra = "";
		if(gender=='f')
			cout << "She ";
		else if (gender=='m')
			cout << "He ";
		else
			cout << "The person ";
		
		cout << "is ";
		if(firstName != "" || lastName != "")
		{
			cout << "called ";
			extra = "and is ";
			if(firstName != "")
				cout << firstName << " ";
			if(lastName != "")
				cout << lastName << " ";
		}
		cout << extra << age << " years old.";
		return 0;
	}
};

int main ()
{
	char gen;
	string fn, ln;
	int year;
	cout << "Description of a person:\n";
gender:
	cout << "Is it a man or woman (m / f)? ";
	cin >> gen;
	if(gen=='m')
		cout << "What is his first name? ";
	else if(gen=='f')
		cout << "What is her first name? ";
	else
	{
		cout << "Invalid input.\n";
		goto gender;
	}
	cin >> fn;
	if(gen=='m')
		cout << "What is his last name? ";
	else if(gen=='f')
		cout << "What is her last name? ";
	cin >> ln;
	if(gen=='m')
		cout << "What is his age? ";
	else if(gen=='f')
		cout << "What is her age? ";
	cin >> year;
	Human Person(fn, ln, gen, year);
	Person.introducePerson();
	return 0;
}

Edit & run on cpp.sh

The problem is that I am still getting a compile error. It says "fatal error LNK1120: 1 unresolved externals". Do I still need to overload it, or is something else wrong?

Aug 12, 2012 at 3:58pm

I don't know why you get that error message. Is that the whole error message?

Aug 12, 2012 at 4:14pm

There should be additional errors telling you which externals are unresolved. Given that the code above is fine, I'd guess that you're not actually compiling what you think you're compiling, or that you've picked the wrong kind of project in your IDE.

Aug 12, 2012 at 6:29pm

This is the exact error message I am getting:

1>  stdafx.cpp
1>  Project.cpp
1>MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
1>C:\Users\Max\documents\visual studio 2010\Projects\Project\Debug\Project.exe : fatal error LNK1120: 1 unresolved externals
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

Does that help with finding the problem?

Aug 12, 2012 at 6:36pm

It does help. You've picked the wrong kind of project in your IDE. You told it you were making a Windows application when you're actually making a plain console application.

Aug 12, 2012 at 6:44pm

Is there a way I can change the file from a windows application to the console application, or do I just create a new file and paste the code into it?

Aug 12, 2012 at 6:50pm

I created a new file that is a console application and pasted the code and am still getting this error message:

1
2
3

1>LINK : error LNK2001: unresolved external symbol _mainCRTStartup
1>c:\users\max\documents\visual studio 2010\Projects\human.cpp\Debug\human.cpp.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Do you know what may be wrong?

Aug 12, 2012 at 6:53pm

A new file won't do. You need to make a new project or whatever your IDE calls them.

As an aside, this thread joins my collection of "reasons why beginners shouldn't use an IDE" threads :)

Aug 12, 2012 at 8:40pm

When I wrote file, I ment project: I created a new project and it still had an error message (the one from my 2:50pm post).

Aug 12, 2012 at 9:32pm

Did you definitely include the file with the code in the new project?

Aug 12, 2012 at 9:50pm

I copied and pasted the code into the new file, what file am I supposed to include.

Aug 12, 2012 at 9:56pm

Maybe you are creating the wrong type of project. I think it should be a "Win32 Console Application".

Aug 13, 2012 at 1:24am

I just relised that none of the programs I have created, even the ones that worked in the past are working, and they are all getting the same error message. Is there anything I might have done to make it do this?

Aug 13, 2012 at 1:43am

I've created this new program:

#include<iostream>
#include<string>

class Restaurant
{
private:
	string restaurant_name;
	int num_waiters;
	int waiter_quality;
	int num_tables;
	int food_quality;
public:
	restaurant();
	~restaurant();
};

int main()
{
	Restaurant MyRestaurant;
	return 0;
}

Edit & run on cpp.sh

and it has the same error message. I also realised that only my projects with classes in them have this error message. Can someone please find th problem?

Aug 13, 2012 at 2:14am

ne555 (10692)

^ You didn't provide the definitions of the constructor and destructor.
The error message should have told you that.

human.cpp.exe weird name...

Aug 13, 2012 at 9:55am