Question on MS Visual C++

[Zichuan]

Hi all,

I am trying to self-learn fundamental of C++, can you guys please enlighten me on why some codes can not be executed on MS visual C++?

For instance, when I try to run the following program, it gives me an error message "Unable to start program... the system can not find the path specified."

#include <iostream.h>
int main()
{
cout << "Hello World!\n";
return 0;
}

Thanks,
Zichuan

 

[doug reich]

Try this version. I have added a specification of the "std" namespace, as well as a proper include for the system library "iostream"

[COLOR=#0066ff][FONT=Courier New]#include <iostream>[/FONT][/COLOR]
[COLOR=#0066ff][FONT=Courier New]int main()[/FONT][/COLOR]
[COLOR=#0066ff][FONT=Courier New]{[/FONT][/COLOR]
std::[COLOR=#0066ff][FONT=Courier New]cout << "Hello World!\n";[/FONT][/COLOR]
[COLOR=#0066ff][FONT=Courier New]return 0;[/FONT][/COLOR]
[COLOR=black][FONT=Verdana]}

[/FONT][/COLOR]

 

[Zichuan]

Hi Doug,

For some reason, it still won't runned. However, the following code which I found at http://www.vtc.com/products/c_plusplus_fundamentals.htm works fine. And the syntax is quite different.

#include"stdafx.h"
usingnamespace System;
int main(array<System::String ^> ^args)
{
Console::WriteLine(L"Hello World");
return 0;
}

 

[cstassen]

try using the code doug posted, but without the "std::" and with a line after the include statement saying
using namespace std;

it shouldn't make much of a difference, but it should work! at least it does onmy ms visual c++

 

[DominiConnor]

In various books and websites you will find C++ code that work in modern C++ compilers.
That applies especially to MS VC++ which two versions ago started to be much more compliant with the standard.
The notion of a Std, ie "Standard" namespace led some implementors to think that it should be included as a default.
I could explain namesapces, but google or any decent modern book will do it for you.

 

[Zichuan]

Thanks you all for helping, I have modified the codes as cstassen suggested, and it gives me the same error message. Can you guys please advise further?

#include <iostream>

int main()
{
cout << "Hello World!\n";

using namespace std;

return 0;
}

 

[doug reich]

try using the code doug posted, but without the "std::" and with a line after the include statement saying
using namespace std;

Move the line you added higher up in the program:

[COLOR=blue][FONT=Courier New]#include[/FONT][/COLOR][FONT=Courier New] [COLOR=#a31515]<iostream>[/COLOR][/FONT]
[COLOR=blue][FONT=Courier New]using[/FONT][/COLOR][FONT=Courier New] [COLOR=blue]namespace[/COLOR] std;[/FONT]
  
[COLOR=blue][FONT=Courier New]int[/FONT][/COLOR][FONT=Courier New] main()[/FONT]
[FONT=Courier New]{[/FONT]
[FONT=Courier New]cout << [COLOR=#a31515]"Hello World!\n"[/COLOR];[/FONT]
 
[COLOR=blue][FONT=Courier New]return[/FONT][/COLOR][FONT=Courier New] 0;[/FONT]
[FONT=Courier New]}[/FONT]

Anyway, you should
1. get a book,
2. google the error messages you have (someone else has always had the same problem), and
3. look in the Visual C++ Help for a tutorial on how to write a program. That will definitely work.

Now that I think of it, in all likelihood you probably created the wrong type of project in Visual C++. You want a Win32 Console Application. It should be checked off as an empty project when you get to that point in the process. Again, read the tutorials.

 

[alain]

Hi Doug,

For some reason, it still won't runned. However, the following code which I found at http://www.vtc.com/products/c_plusplus_fundamentals.htm works fine. And the syntax is quite different.

#include"stdafx.h"
usingnamespace System;
int main(array<System::String ^> ^args)
{
Console::WriteLine(L"Hello World");
return 0;
}

This looks a lot like C# so, I might be inclined to think that this is how managed C++ looks like or some kind of M$ version outside of standard C++.