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manc
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Posts: 551
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 Posted: Wed Jul 02, 2008 12:56 am Post subject: [C++] Compiling errors (take a look) |
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| Code: | #include <iostream>
void main()
{
//define variables
float num1;
float num2;
float total;
//enter data for the variables
cout << "Enter a value for the first variable: ";
cin >> num1;
cout << "Enter a value for the first variable: ";
cin >> num2;
//add the two numbers together
total = num1 + num2;
//Display the result
cout << "The sum of the numbers = " << total << endl;
} |
I followed a video tutorial ( he was using Microsoft visual studios Version 6 ) and well, I have the same exact code as he does in the tut, but his old compiler gives no errors, mine however gives:
Line 5: 'main' must return 'int'
(In function 'int main(...)'
Line 11: 'cout' undeclared (first use this function)
(Each undeclared identifier is reported only once for each function it appears in.)
Line 12: 'cin' undeclared (first use this function)
Line 20: 'endl' undeclared (first use this function)
So I'm guessing I need to 'declare' these functions, but how exactly do I do so? And I have no idea on line 5. Not a mention of 'int' in the tutorial.
Any help would be much appreciated.
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hcavolsdsadgadsg
I'm a spammer
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Posts: 5801
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| Posted: Wed Jul 02, 2008 1:01 am Post subject: |
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int main()
std::cout
std::cin
std::endl
the tutorial is probably ancient
| Code: | #include <iostream>
float num1;
float num2;
float total;
int main()
{
std::cout << "Enter a value for the first variable: ";
std::cin >> num1;
std::cout << "Enter a value for the first variable: ";
std::cin >> num2;
total = num1 + num2;
std::cout << "The sum of the numbers = " << total << std::endl;
return 0;
} |
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manc
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| Posted: Wed Jul 02, 2008 1:10 am Post subject: |
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Ok, all thats left is the undeclared errors.
Where exactly does the | Code: | std::cout
std::cin
std::endl |
part go? Just anywhere in the brackets? I'll experiment meanwhile.
EDIT: FUCK IT, I'm trying a different tut.
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hcavolsdsadgadsg
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| Posted: Wed Jul 02, 2008 2:58 am Post subject: |
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| manc wrote: | Ok, all thats left is the undeclared errors.
Where exactly does the | Code: | std::cout
std::cin
std::endl |
part go? Just anywhere in the brackets? I'll experiment meanwhile.
EDIT: FUCK IT, I'm trying a different tut. |
What? Just prefix std:: to cout, etc. I even posted a damn example.
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Noz3001
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| Posted: Wed Jul 02, 2008 3:25 am Post subject: |
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| If you still get errors add "using namespace std;". It includes the whole thing but it's the only thing which works in some cases. (Code::Blocks?...)
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Caelestis
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| Posted: Wed Jul 02, 2008 9:53 am Post subject: |
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| I don't know C++, but I'm pretty sure you didn't use a namespace..
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Jani
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| Posted: Wed Jul 02, 2008 9:58 am Post subject: |
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| manc wrote: | | EDIT: FUCK IT, I'm trying a different tut. |
If the old one teaches you to code like that I totally agree with checking out a different tutorial. :P
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Caelestis
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| Posted: Wed Jul 02, 2008 10:00 am Post subject: |
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| Want some of my C++ ebooks? I have like 5 gigs of ebooks about computers. About 40 C++ ones.
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manc
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| Posted: Wed Jul 02, 2008 1:11 pm Post subject: |
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| Caelestis wrote: | | Want some of my C++ ebooks? I have like 5 gigs of ebooks about computers. About 40 C++ ones. |
Thanks for the offer, but Im going to stick with cplusplus.com for now. Its getting the job done.
And THANK YOU to slovach 
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MegaForum
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| Posted: Thu Jul 03, 2008 1:23 pm Post subject: |
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Or you can use
| Code: |
using namespace std;
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Much easier imo instead of having to do std : : before all the lines.
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Noz3001
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| Posted: Thu Jul 03, 2008 2:07 pm Post subject: |
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| MegaForum wrote: | Or you can use
| Code: |
using namespace std;
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Much easier imo instead of having to do std : : before all the lines. |
He doesn't want to include the whole thing though.
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Typhoon808
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| Posted: Thu Jul 03, 2008 3:09 pm Post subject: |
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You could either add the std prefix to the code, or just use the certain parts of the namespace, instead of using all of it:
| Code: |
using std::cout;
using std::endl;
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I'm nowhere near great at C++, but if I ever need it for one of my nubby console apps, I would just use the certain sections of the namespace or add the prefix. 
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lul30
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| Posted: Sat Jul 05, 2008 7:02 am Post subject: |
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Here I did this without a C++ book because I wanna know how far I am at coding in C++ ( just begon 1 day).
Its easy for me because I have C# , java and Vb knowledge.
This is what I came up with:
#include "stdafx.h" // this is my default header of C# (c++)
#include <iostream>
using namespace std; // Using namespace to create room for byte to show a message , if im correct(correct me if im wrong)
int main() // use to be void , void is use to not show or give a message and thats the point of the program so It should be Int
{
//define variables
Int num1;
Int num2;
Int total;
//enter data for the variables
cout << "Enter a value for the first variable: ";
cin >> num1;
cout << "Enter a value for the second variable: "; // Second variable >< it use to said put in first.
cin >> num2;
//add the two numbers together
total = num1 + num2;
//Display the result
cout << "The sum of the numbers = " << total << endl;
return 0; // EVERY int Main() MUST have a return value
}
#working like a charm 
#EDIT:: big adjustment to the code WHY are you using floats  where working with numbers, so use Int or double if you whant to use whole numbers like 10,12,125,1421341 and not 12,213 and such..
Greetz
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atom0s
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| Posted: Sat Jul 05, 2008 8:53 am Post subject: |
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| lul30 wrote: | Here I did this without a C++ book because I wanna know how far I am at coding in C++ ( just begon 1 day).
Its easy for me because I have C# , java and Vb knowledge. |
I wouldn't really say much of those but Java help at all with C++.
| Quote: | | #include "stdafx.h" |
You have precompiled headers turned on most-likely or your IDE/compiler creates them for you to assume you will be using them. You can turn it off and avoid having to use these in most if not all compilers.
| Quote: | | using namespace std; // Using namespace to create room for byte to show a message , if im correct(correct me if im wrong) |
Using a namespace simply make you not have to use the namespace prefix for it's members. For example, cin. Without using the namespace like you did, you would have to type:
| Code: | std::cin
or
std::cin.whatever(); |
Including the namespace just makes you avoid having to do that, but it does include the entire namespace which in some opinions is a waste and just creates a lazy coder. I personally dislike using namespaces like this and rather just use the prefixes as the std namespace is rather large and it is highly doubtful you will ever use everything in it in one project.
| Quote: | | int main() // use to be void , void is use to not show or give a message and thats the point of the program so It should be Int |
The main function return is int by standards, some compilers will not accept anything but int, while others will handle any type of return, or most will only accept void or int. But, by 'C' standards the return is int.
| Quote: | Int num1;
Int num2;
Int total; |
It's int not Int, C is case sensitive.
Just tossing some info out there, not trying to criticize.
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lul30
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| Posted: Sat Jul 05, 2008 9:07 am Post subject: |
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No no no I really thank you for your comments i like to have someone who corrects me.
It make's me understand that im not qiuet there yet ,and needs to learn more.
And about the "Int" that was just a automatic typing thing to start with a capital. In the source its 'int' ofcourse i know that of java. Like you told me it will help me understand more about c/c++.
wiccaan: Is there a tut out for coding a .dll or something because the point of me learning c++ is making a trainer for maplestory.
Not that I like to hack maplestory but just that i can contribute to a forum.
Or do you want to be my mentor if i dont know what to do?
Thank you very much Wiccaan!
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