Re: What's wrong with my code?
- From: "qubit" <lauraeaves@xxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Tue, 6 Jul 2010 15:18:42 -0500
actually there are 3 arguments to main, although the third one is not as
well known:
int main(int argc, char** argv, char** envp)
where envp is a list of strings giving the environment variables and their
values in the format
"varname=value"
The end of the list is a null entry in the list.
If you're on unix, try it; if on windows, I have no idea what it will do.
Note that 2 functions declared with different parameter prototypes are
different functions; the only reason main is any different is that C++
special cases the main function so you can give it any arguments you like --
but know that the operating system will pass it the argc, argv and envp
arguments, so getting creating with argument types is not recommended.
Happy hacking.
--le
----- Original Message -----
From: "R Dinger" <rrdinger@xxxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, July 06, 2010 12:12 PM
Subject: Re: What's wrong with my code?
The argv and argc parameters have always been a part of the language
definition and come from the C language. Those arguments were in the IBM
port of the Bell Labs version of C++ that I used at Boeing back in the late
1980's. And as far as I know they have also always been part of the C
language definition.
Richard
----- Original Message -----
From: "Joseph Lee" <joseph.lee22590@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, July 06, 2010 8:48 AM
Subject: RE: What's wrong with my code?
Hi,
Huh... that's something new... I've only seen that under VS.
Cheers,
Joseph
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Tyler
Littlefield
Sent: Tuesday, July 06, 2010 8:45 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: What's wrong with my code?
Eh? The added code? It's not "added," nor is it a problem. It's for
receiving command line arguments.
Thanks,
Tyler Littlefield
http://tds-solutions.net
Twitter: sorressean
On Jul 6, 2010, at 9:36 AM, Joseph Lee wrote:
> Hi,
> The added code is done from VS (I remember having that problem and fixed
> it by creating a general CPP project).
> Cheers,
> Joseph
>
> -----Original Message-----
> From: programmingblind-bounce@xxxxxxxxxxxxx
> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Midence
> Sent: Tuesday, July 06, 2010 8:25 AM
> To: programmingblind@xxxxxxxxxxxxx
> Subject: Re: What's wrong with my code?
>
> Hi, all,
>
> This looks like something I'm working on too. I've a question though:
>
> Why do books tell you to write:
> int main()
>
> but, I've seen folks here and on some websites I've looked at write:
>
> Int main (int argc; char; **) or something like that?
>
> Thanks,
> Alex M
>
>
> On 7/6/10, Dave <davidct1209@xxxxxxxxx> wrote:
>> Hi Jes,
>>
>> Something helpful that folks do in industry (not so much in academia
>> from my experience though) is called a code review where people insert
>> specific comments on selected lines of code. I'll go ahead and do
>> that below prefixing my comments with "dave:". Ken and Joseph had
>> some great comments as well.
>>
>> //Ch5 Exercise 4, page 287 //Calculates and displays the average of
>> three test scores
>> dave: "//" only need one per line. You only need to put another "//"
>> if you start a new line (it doesn't matter how many sentences you have
>> in a comment as long as they're still on the same line.)
>>
>> //created/revised by Jes Smith on July 5 2010
>>
>>
>> #include <iostream>
>> using <<std::cout;>>
>> using <<std::cin;>>
>> using <<std::endl;>>
>> dave: "using" has the purpose of restricting namespaces such as "using
>> namespace std;". This has the effect of letting you say
>> cout << "hello!"
>> as opposed to
>> std::cout << "hello!"
>> It's a good topic to read up on in a C++ book.
>>
>> //declare variables
>> int score_1 (0);
>> int score_2 (0);
>> int score_3 (0);
>> dave: these are declared with global scope; you may want to consider
>> putting them in the main routine below. Also, simple types like int
>> or float can be assigned to (such as int a = 0;).
>>
>> //begin program
>> int main()
>> {
>> cout< "Please enter your first test score. You may enter decimal values:
>> "
>>> ;
>> dave: the "<>" syntax can be tricky here. the "<<" operator directs
>> the string on the right to the stream on the left. It should be
>> written as
>> cout << "hello!";
>>
>> cin << score_1 >>;
>> cin <<score_2 >> ;
>> cin <<score_3 >> ;
>> dave: Think of cin as an in-coming stream which you want to direct
>> elsewhere. The "cin" blob is just a user typing stuff and you want to
>> direct it to a variable. To do this, you can write
>> cin >> some_var;
>> The cin object only "writes" to the variable when the user presses enter.
>>
>> return 0
>> }
>>
>>
>>
>> Hth!
>> Dave
>>
>> On 7/5/10, Hrvoje Katić <hrvojekatic@xxxxxxxxx> wrote:
>>> Hi,
>>>
>>> Instead of writing
>>> using std::bla
>>> it's enough to write
>>> using namespace std
>>>
>>> Hrvoje
>>>
>>> On 6.7.2010 5:54, Jes wrote:
>>>> Hi all,
>>>> This is a programming assignment I'm trying to do out of the class
>>>> text book. Any assistance would be appreciated, as well as any
>>>> feedback on how I am doing writing the code. I have this habit of not
>>>> writing the code all the way through, and compiling the program bit by
>>>> bit to make sure I don't get any errors in the process of coding. I
>>>> just want to make sure that the code I have already written is working
>>>> as it should before I continue writing. I'm sure this is not a good
>>>> habit to get into.
>>>> Thanks for any help.
>>>> Jes
>>>>
>>>> //Ch5 Exercise 4, page 287 //Calculates and displays the average of
>>>> three test scores
>>>> //created/revised by Jes Smith on July 5 2010
>>>>
>>>> #include <iostream>
>>>> using <<std::cout;>>
>>>> using <<std::cin;>>
>>>> using <<std::endl;>>
>>>>
>>>> //declare variables
>>>> int score_1 (0);
>>>> int score_2 (0);
>>>> int score_3 (0);
>>>>
>>>> //begin program
>>>> int main()
>>>> {
>>>> cout< "Please enter your first test score. You may enter decimal
>>>> values: " >;
>>>> cin << score_1 >>;
>>>> cin <<score_2 >> ;
>>>> cin <<score_3 >> ;
>>>>
>>>> return 0
>>>> }
>>>>
>>>
>>>
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