So what am I doing wrong?
Author
So, I'm a newbie and I picked myself up a book on C++, and downloaded Dev-C++. I'm currently working on the "Hello World" basic program in the first chapter of the book. The source code is:
#include <iostream.h>
int main()
{
cout << "Hello World!\n";
return 0;
}
I can't seem to get it to run without errors. Am I compiling wrong, or do I just suck at life? Any help will be appreciated, thanks.
Quote:Original post by ItsNotATumaaa
So, I'm a newbie and I picked myself up a book on C++, and downloaded Dev-C++. I'm currently working on the "Hello World" basic program in the first chapter of the book. The source code is:
#include <iostream.h>
int main()
{
cout << "Hello World!\n";
return 0;
}
I can't seem to get it to run without errors. Am I compiling wrong, or do I just suck at life? Any help will be appreciated, thanks.
Umm... May I ask which book? I don't want to sound harsh but any book that teaches the first program to you wrong should be thrown out. Literally.
I suggest you try Beginning C++ Game Programming.
Now, to correct it:
#include <iostream.h> // No '.h', any good book should teach that the [current]// standard library does not have an extension on the files.int main() { // Ok. std::cout << "Hello!\n"; // Cout resides in the std namespace. You'll learn that later on, but remember this: // either have 'std::' in front of everything from the std, or on the top of the // file put "using namespace std;'. return 0; // Ok.} // Ok.
#include <iostream>using namespace std;int main(void){ cout << "Hello World" << endl; return 0;}edit: Damn too slow
Author
#ifndef _BACKWARD_BACKWARD_WARNING_H
#define _BACKWARD_BACKWARD_WARNING_H 1
#ifdef __DEPRECATED
#warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.
#endif
#endif
#define _BACKWARD_BACKWARD_WARNING_H 1
#ifdef __DEPRECATED
#warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.
#endif
#endif
Unfortunately it appears your book is obsolete and will therefore be more of a hinderance than a help. I strongly suggest you throw it out and get a new one. Pre-standard C++ (pre 1998) usually had a header named <iostream.h>. This was eliminated when C++ was standardised and replaced with the header <iostream> which is similar to the old <iostream.h> but (among other changes) uses the std namespace. Your corrected example in standard C++ would therefore be:
Don't be fooled into thinking that all the changes made in the standardisation of C++ and beyond are as trivial. An old, obsolete book will teach you bad practices that will be hard to unlearn.
Σnigma
#include <iostream>int main(){ std::cout << "Hello World!\n"; return 0; // this line is not actually necessary // the main function (and only the main function) implicitly // returns zero if no return statement is included.}Don't be fooled into thinking that all the changes made in the standardisation of C++ and beyond are as trivial. An old, obsolete book will teach you bad practices that will be hard to unlearn.
Σnigma
Author
It's called Sams Teach Yourself C++ in 21 days.
Note: I just looked at the publishing and it's 1999. Damn, I thought it was brand new.
Note: I just looked at the publishing and it's 1999. Damn, I thought it was brand new.
Author
Thanks for your help, I should have checked the date it was published before I bought.
So, I wrote the updated code and I received no errors, and saved the file to .cpp. Now how do I link and run it?
(Sorry, I'm a big newbie.)
So, I wrote the updated code and I received no errors, and saved the file to .cpp. Now how do I link and run it?
(Sorry, I'm a big newbie.)
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