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Compiling Error VS2010

Posted on 2010-09-22
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Last Modified: 2012-05-10
Hi,

I am the beginner of Visual C++(2010), I got the compiling errors
from this attached code.

Please give me advice.
Thanks,
JT
#include "stdafx.h"
#include <iostream>

using namespace std;

class A
{
public:
	int x,y,z;
	A(int a, int b, int c) { x=a; y=b; z=c;}

}

ostream &operator<<(ostream &stream, A o)
{
	stream << o.x << ",";
	stream << o.y << ",";
	stream << o.z << endl;

}

using namespace System;

int main(array<System::String ^> ^args)
{
    //Console::WriteLine(L"Hello World");
    A a(1,2,3), b(2,3,4), c(5,6,7);
	cout << a << b << c;
    return 0;
}

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Question by:jtran007
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10 Comments
 
LVL 32

Expert Comment

by:phoffric
ID: 33740316
Could you list the errors with the line numbers?
0
 
LVL 32

Expert Comment

by:phoffric
ID: 33740323
I'm not sure what System namespace is. AFIK for your includes, line 4 should be good.
0
 
LVL 86

Expert Comment

by:jkr
ID: 33740512
The C++ part has a few problems nin terms of syntax and declaration of such an operator, the following works fine:
#include <iostream>

using namespace std;

class A;

ostream& operator<<(ostream &stream, A& o);

class A
{
friend ostream& operator<<(ostream &stream, A& o);
public:
	int x,y,z;
	A(int a, int b, int c) { x=a; y=b; z=c;}

};

ostream& operator<<(ostream &stream, A& o)
{
	stream << o.x << ",";
	stream << o.y << ",";
	stream << o.z << endl;

}


int main()
{

    A a(1,2,3), b(2,3,4), c(5,6,7);
	cout << a << b << c;
    return 0;
}

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LVL 86

Expert Comment

by:jkr
ID: 33740520
Ooops, sorry, little correction:
#include <iostream>

using namespace std;

class A;

ostream& operator<<(ostream &stream, A& o);

class A
{
friend ostream& operator<<(ostream &stream, A& o);
public:
	int x,y,z;
	A(int a, int b, int c) { x=a; y=b; z=c;}

};

ostream& operator<<(ostream &stream, A& o)
{
	stream << o.x << ",";
	stream << o.y << ",";
	stream << o.z << endl;

   return stream;

}


int main()
{
    A a(1,2,3), b(2,3,4), c(5,6,7);
	cout << a << b << c;
    return 0;
}

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0
 
LVL 32

Assisted Solution

by:phoffric
phoffric earned 50 total points
ID: 33740543
I thought the author just wanted advice in order to learn.
0
 

Author Comment

by:jtran007
ID: 33740833
Hi,

Thanks jkr. You are ringt; however, I'd like this code running under VS2010 for c++ since
once I chose the console project, the Visual studio automatically adds "using namespace System"
and int main(array<System::String ^> ^args).
How is this code modified to work in this vs2010 environment but still keeps the same function call?

Thanks again,
JT
0
 
LVL 86

Expert Comment

by:jkr
ID: 33740924
You mean the following?
int main(int argc, char** argv)
{
    A a(1,2,3), b(2,3,4), c(5,6,7);
	cout << a << b << c;
    return 0;
}

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Author Comment

by:jtran007
ID: 33746066
Hi jkr,

I mean this call which is autmatically added by VS2010 when the console app is chosen:

int main(array<System::String ^> ^args)

Do you have any idea since it is totally different from the one (int main(int argc, char** argv)
that I usually use in VS6.0.

Thanks,'
JT
0
 
LVL 86

Accepted Solution

by:
jkr earned 200 total points
ID: 33746095
Well, that is the managed equivalent to 'main()' - if you don't want this, be sure to create an unmanaged project.
0
 

Author Closing Comment

by:jtran007
ID: 33779999
Thanks,
JT
0

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