Thread: Noobs reading "Jumping into C++" - Practice Problems discussion

The more direct approach would be to post your actual question on a new thread, and get specific help on the topic you're stuck on.

Your post basically reads as "please send me your answers".

It seems unlikely that there are others who are at the same point of going through the same material as you, and are members of the same forum.

You may as well show us what you're working on. Besides, you'll be shown much better solutions from others on here who are well beyond the beginner stage.

I do have an very remedial question regarding FOR loops.

As I understand from what I read in the book, when a FOR loop is defined, the variable that is utilized does not have to be declared prior to that loop, so the for definition actually declares and/or initializes a variable (or can use a variable that has already been declared).

If I were to use a variable in a FOR loop that was not previously declared, is the scope of that variable limited to that loop?

Example, just to be clear:

Code:

for ( int i = 0; i < 10; i++ )
{
cout << i << '\n';
}

In this example, it is possible that variable i is declared first in this for loop. If this is the case, would i only be available for the code "cout << i <<'\n\;"? (such that this variable functions only as a marker to execute a specified number of redundant tasks). I am assuming this is the case but the book did not mention a scope concern.

Originally Posted by Jeff Dean

I am a complete newbie to coding. I am using Allain's book "Jumping into C++" as an introduction to C++. I have looked for a way to contact or read posts from others who are working through this book. At this point I am not stuck on a particular problem, but was hoping to hear from those who is working with this book. If this is an inappropriate use for this board, I apologize.

Oh, it's not so much inappropriate, it's probably just a bit too optimistic. It's better to provide something to talk about to start the ball rolling, and let the discussions go wherever they go.
Others in a similar situation are more likely to find this forum and thread if there is something interesting or useful within it that relates to their situation.

In the mean time, lets discuss something specific.

Please don't put your reply in code tags.
Put only the code in code tags.

I do have a question. I am just starting out with C++ as you may have guessed and in the first program (the "Hello world" program) i opened the sample, pressed F9 and of course it said, "Hello world."

Heres the thing thats getting me...
the program:

Code:

# include <iostream>

Code:

using namespace std;

int main ()
{
      cout << "HEY, you, I'm alive! Oh, and Hello World!\n";
}

Now correct me if im wrong, but shouldn't the program show "HEY, you, I'm alive! Oh, and Hello World!" as opposed to just "Hello World!"? The book tells me I should play around with the program and try to make it say different things. No matter what I type, or omit within the quotations it always says "Hello World!" when I execute it.

Now I could be overlooking something obvious but right now I havent a clue why its doing that. Help?

EDIT:​ Actually at this point, it doesnt matter if i start a new project or anything, for the hell of it i clicked "Run" and it did it again. I guess im not using Code::Blocks correctly i guess....

EDIT: Managed to get it to stop the Hello World program... kind of... now when i put in the program its telling me that "<iostream>" doesnt even exist ("no such file or directory")

>>EDIT:​ Actually at this point, it doesnt matter if i start a new project or anything, for the hell of it i clicked "Run" and it did it again. I guess im not using >>Code::Blocks correctly i guess....

I just tried simulating the problem and I'm not able to reproduce. The F9 on Code::Block actually recompiles and runs the compiled code. So for sure I would expect to see the changes you've made.

One other things I noticed was that, the code::block takes the text from the current editor buffer. Meaning you dont have to save the code before you F9. In fact it saves and then recompiles the code. Whatever it is, you do to the code I think it should work. If it dosn't I strongly suggest you close and reopen the code::block and just try it a single empty file rather than creating a new project.

ssharish