Re: What's wrong with my code?
- From: Tyler Littlefield <tyler@xxxxxxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Tue, 6 Jul 2010 09:27:53 -0600
what you've seen is:
int main(int argc, char** argv)
or
int main(int argc, const char** argv)
or
int main()
or
int main(void)
Basically the last two accept no arguments. The first two, the number of
arguments goes to argv, and argv is an array of pointers to strings holding the
args passed on the command line.
The int just tells it what it returns, which is the program's exit code.
Thanks,
Tyler Littlefield
http://tds-solutions.net
Twitter: sorressean
On Jul 6, 2010, at 9:25 AM, Alex Midence wrote:
> 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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