RE: What's wrong with my code?
- From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Tue, 6 Jul 2010 16:04:11 -0400
I want to fix what I said in my last two posts. The int is required the
arguments are not. No one has clearly defined the arguments so I will now.
int argc is the number of command line arguments it tells you how many strings
of characters will be in argv which is a array of strings. So if you get 2
then you have the executable name in argv[0] and the first passed argument in
argv[1]. For example if your program name was prog and you ran it like this
prog Hello
You would have the following
Argv[0]=="prog"
Arg[1]=="hello"
The return int on main should be 0 for program exited normally and error code
if it did not.
Ken
command and an argument.
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Midence
Sent: Tuesday, July 06, 2010 11:25 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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