C / C++ / MFC

Re: Large project how to seprate definition and declaration?

14-Jun-16 20:34

even your code giving error. Have a look at screenshot please. However, Thank you for showing me the correct way to code. I got many point out of it.

Screen Shot of Error = http://i64.tinypic.com/16m0zr4.jpg

leon de boer15-Jun-16 3:53

Re: Large project how to seprate definition and declaration?

15-Jun-16 3:53

Something funky with GCC compiler but easy to fix include float.h ... its doesn't know what FLT_EPSILON, FLT_MAX are.

These are standard C++ Macro constant definitions so you can just look it up
(float.h) - C++ Reference[^]

So top of Source.CPP becomes

#include <iostream>
#include <float.h>         // Added to define FLT_EPSILON & FLT_MAX
#include "calculation.h"
#include "input.h"
using namespace std;

In vino veritas

Hassan Syed115-Jun-16 4:32

Re: Large project how to seprate definition and declaration?

15-Jun-16 4:32

More errors Frown | :(

Thank you for your guidence at least i am learning new things.

Screen Shot = http://i65.tinypic.com/ncjddc.jpg[^]

leon de boer15-Jun-16 6:21

Re: Large project how to seprate definition and declaration?

15-Jun-16 6:21

That one is you ... It is basically telling you it can't find the code for GetFloatInput.
GetFloatInput is defined in Input.H and Input.CPP which are included see here

#include <iostream>
#include "calculation.h"
#include "input.h"     // <----- GetFloatInput is defined in this include>
using namespace std;

So we are down to either a typo error or you haven't included Input.CPP into your source files. I assume you cut and paste so unlikely to be a typo so lets try number two.

Did you use the menu system and do .... Project... Add files... to add the new .H and .CPP to your source files to the project? I don't use code blocks but it will be something like that.

Can I ask you to show me the line about the deprecated string function points to .. I am interested to see what GCC is complaining about.

There is possibly another warning you are going to get on the definition of main in Source.CPP can you change it from int main() to

int main(int argc, char**argv)

That is the technically correct definition, not the Microsoft shorthand I used.

In vino veritas

modified 15-Jun-16 12:50pm.

Hassan Syed115-Jun-16 7:01

Re: Large project how to seprate definition and declaration?

15-Jun-16 7:01

Excellent. Working fine now however I have to remove scanef_s. that _s was creating problem so i only remove _S and scanef remain as it. Now code working fine. Thank you for ur guidance. Now i got the clear idea how to write the code. I will copy the way you wrote this code. I am not a bad student however I like programming but problem is I think i am unable to think like a programmer. I am trying hard for that but no success yet Frown | :(

I want to excel in this field but sometimes I stuck Cry | :((

leon de boer15-Jun-16 8:04

Re: Large project how to seprate definition and declaration?

15-Jun-16 8:04

We all get stuck at times Smile | :)

It is really pleasing to see you are willing to apply yourself to learn. None of us are born able to think like a programmer it is like any profession something you get good at by application of lots of time and effort.

Your long single file code is sort of normal basic student level code, it works in a fashion. You are now seeking to move beyond that and I can only encourage that. All I did was really shorten up your code by making functions with more parameters and putting in error checking for things like typing letters instead of numbers etc. There are improvements you could do by using objects or classes but that is more stuff you are yet to learn.

I looked up the problem with scanf_s it is they have changed security with this, you now need to use "%hu" rather than "%u" as meaning a pointer to an unsigned short. That tells you how many years since I have written code for a console application Smile | :)

So there are two fixes to remove the warning correctly

unsigned short iResult;   // Define iResult as unsigned short not unsigned int

int err = scanf_s("%hu", &iResult);   // Use %hu this should be error free on GCC

In vino veritas

modified 15-Jun-16 14:35pm.

Hassan Syed115-Jun-16 8:48

Re: Large project how to seprate definition and declaration?

15-Jun-16 8:48

You are right. i am completely new and it was my class assignment number 1. I finsihed it and submitted it already but then I came to know professionals never write everything in main that's why i decided to search in this direction. By your improved code I can see a boundery wall is set for wrong inputs. Which i wanted to set in my project as well but was not sure how to set those powerful boundaries as you set. I want to excel in this game of programming, I am not an extera ordinary student but i will keep on trying it day by day Smile | :)

Following are few things I extracted from ur code which I am going to follow for the next time code or will at least try my best to do similar things. Correct me if I observed wrong. I did not follow the following things in my code. If I missed any point then point me that as well.

1) You are using braces by giving one space and starting 1st curly brace in-front of the statements like while and if.

2) All variable you wrote in small letters and to make them more clear u out _ sign to link them.

3) Function name 1st character and then the 2nd meaning name of function is capital.

3) 1 step indentation on each step involving in some kind of computation.

4) You used unsigned when you feel that value are in +ve.

modified 15-Jun-16 17:27pm.

leon de boer15-Jun-16 20:00

Glut errors with Mingw on windows

15-Jun-16 20:00

correct on all counts, you have correctly identified that the standard makes the code much more easily readable and helps you identify errors. I enforce the standards at our company and I therefore never write without using that standard. The standard we use is essentially an extension of C99 or sometimes called ANSI-C standard and is used heavily in the sector I work, which is embedded programming.

Companies in the game market you are looking at tend to use C++ (UNREAL GAME ENGINE etc) or C# (UNITY GAME ENGINE) and there standard may differ slightly as the majority of the code won't be C compliant, and they have other pressures for readability. So generally in large companies you will be expected to write to a standard and there will usually be a process to check code into the active repository.

So while learning coding try and have your own standard but just remember you may have to adapt when you are employed. The company is not going to rewrite an entire repository to your standard even if you could argue it was better. So my standard is not the "absolute best" it's just a standard I would generally have to write to at work.

In vino veritas

Ratul Thakur11-Jun-16 7:03

Ratul Thakur

11-Jun-16 7:03

i need to set up glut on my windows machine.
i have glut.h in the include\GL folder , libglut32.a in the lib folder and glut32.dll in the windows\system folder
i compile as follows:
g++ -Wall main.cpp -mwindows libglut32.a -lopengl32 -lglu32
i also have the windows.h , gl/glut.h and gl/gl.h included.
and actually my compiler is tdm-gcc (mingw64)
it gives me lots of errors like:
undefined reference to _glutmainloop...

how do i solve this?

Re: Glut errors with Mingw on windows

Ratul Thakur11-Jun-16 20:02

Ratul Thakur

11-Jun-16 20:02

lol i solved this....
i think glut was too old for my compiler ... so i downloaded freeGLUT and it worked Smile | :)

Re: Glut errors with Mingw on windows

leon de boer11-Jun-16 22:59

Re: Glut errors with Mingw on windows

11-Jun-16 22:59

GLUT is deprecated on Visual Studio it no longer exists as a standard unit and is recommended not to use, which is what all the errors were about and why you needed to download freeGLUT.

In vino veritas

Ratul Thakur11-Jun-16 23:59

Ratul Thakur

11-Jun-16 23:59

yea..
same is the case with codeblocks and bloodshed dev-cpp

Why no boundry condition set for C++

Hassan Syed111-Jun-16 4:52

11-Jun-16 4:52

What is the main reason even till day-today there is no boundry condition set for C++. Why not compiler resist that we are pointing something out of the range of our array or we are pointing to a memory location which we cannot points to as it is not in the allowed range of our source code. Why not C++ creator or the IOS committee which build the standard put a check on this thing. There must be some reason of this freedom to point anywhere. I want to know that reason why they are doing like this. If a person like bjarne stroustrup can write such an advance programming language then there must be something special he left this imporant check to move in memory anywhere. If you know about this please share with me. I am curious to know the logic behind it. I asked this question from my teacher but instead of answering me he said this is not a part of my course Frown | :(

I am new student to programming

Richard MacCutchan11-Jun-16 5:08

Richard MacCutchan

11-Jun-16 5:08

You should ask Bjarne Stroustrup[^].

Hassan Syed111-Jun-16 5:27

11-Jun-16 5:27

If you don't know the answer by ur-self then keep quite.

Patrice T11-Jun-16 6:02

Patrice T

11-Jun-16 6:02

Hassan Syed1 wrote:
What is the main reason even till day-today there is no boundry condition set for C++.

It is by design, just like with C, its ancestor language. You, as a programmer, are responsible to do all the checking manually.
May be you should ask Brian Kernighan and Dennis Ritchie.
The C Programming Language - Wikipedia, the free encyclopedia[^]
The C++ Programming Language - Wikipedia, the free encyclopedia[^]

Patrice

“Everything should be made as simple as possible, but no simpler.” Albert Einstein

modified 11-Jun-16 12:08pm.

leon de boer11-Jun-16 22:53

11-Jun-16 22:53

You are assuming that there are ordered limits to the set and that boundary has meaning. In a nutshell you seem to be inferring that sets are something like ordered numbers. It's a construction class so lets expand it to the general form, I have a set I called animals in which I inserted an chicken, a pig and a dog.

I now have a Lion is this inside or outside the boundary condition of my animal set? Do you see the problem with your question? What if I told you that my animal set was domestic animals does that change your answer?

Do you get that even if I have a set of numbers in a generic set, those numbers are just place holders for "things" such as animals ... they aren't really numbers like you are using them.

So you may want to review set theory
Set theory - Wikipedia, the free encyclopedia[^]

So the correct answer is if you want boundary conditions on your set because there is some logical order to them, then extend the class yourself. That behaviour is not natural to a generic set class so why would you expect it to be in a generic set class. Nobody has ever asked for that behaviour because it's wrong under set theory, as you are making some very specific sorted or ordered set.

In vino veritas

modified 12-Jun-16 5:18am.

enhzflep14-Jun-16 1:34

enhzflep

14-Jun-16 1:34

It sounds an awful lot like you're asking - why does a fast and powerful language like C++ not have one of the performance killers of languages that require less skill to use.

Simply, because with C/C++ you're given the power to shoot yourself in the foot. If you do so, it's your own stupid fault, not that of the language that lets you do it.

If you have an array of a million elements and you wish to access each of them, you're expected to know that you're not trying to access an element before or after your allocated memory. The alternative is to assume you have or will screw-up and to perform 1 million bounds checking operations. No - that's not cool. That's a nice feature for sub-par programmers.

Also, hassan syed1 - it's Bjarne Stroustrup, not bjarne stroustrup. You capitalized your own name but thought his not significant enough to afford him the same respect?

Converting Fortran source to C++ Source

Maximilien14-Jun-16 10:25

Maximilien

14-Jun-16 10:25

It does offer boundary condition, just use modern C++ constructs (vector, array, string...) instead of their unsafe C equivalent (pointers, char*...)

If you are using a modern version of Visual Studio, there are additional checks made by the compiler and runtime to check boundary conditions (Security Features in the CRT[^]) and also they offer a set of safer runtime API (all the _s functions like strcpy_s instead of strcpy)

Remember that if the language let you shoot yourself in the foot, there is no excuse try not to by following best practice when coding.

I'd rather be phishing!

manoharbalu9-Jun-16 1:58

manoharbalu

9-Jun-16 1:58

We have 5 to 6 Fortran Libraries each of which contains at least 60 to 70 fortran source files (.for). These libraries are linked in an application developed in PASCAL language under Delphi 5 IDE.

Now, Since we want to redevelop the application using MFC, the Delphi Pascal application could be possibly redeveloped in MFC.

My question is...Is there any easy and quick way of converting the fortran libraries to C or C++ to be linked with the redeveloped application in MFC

Jochen Arndt9-Jun-16 2:30

Jochen Arndt

9-Jun-16 2:30

There might be no need to convert the libraries. It should be sufficient to create header files defining the exported functions and the calling conventions and linking the MFC application against the libraries.

Depending on how the libraries has been build, you may also try to rebuild them using options for C/C++ access. Your FORTRAN compiler/linker documentation should have some information about building libraries to be accessed from C/C++.

manoharbalu9-Jun-16 2:52

manoharbalu

9-Jun-16 2:52

The Fortran Libraries were built using Fortran compiler in visual studio 97 IDE in Winxp OS

As we had moved to Win 7 and later, We dont want to use the Fortran Compiler anymore. But the Libraries require periodical updations and rebuild.

Is that possible without conversion from Fortran to C++?

Please advise and provide any alternate suggestions if any.

Jochen Arndt9-Jun-16 3:27

Jochen Arndt

9-Jun-16 3:27

I don't know if it is possible.

When using an old Fortran compiler with a newer C/C++ project, the libraries must be build as static libraries.

It depends also on the dependencies of your Fortarn libraries. You can use the Dependency Walker (depends.exe) Home Page[^] to load your Fortran DLLs and check which other dependencies exist. If there are some, you might have problems because those might refer to quite old DLL versions.

You can check it using a small test project:

C++

#include <stdio.h>

// Link with library. Copy library to build path (debug / release),
//  specify full path here, or add path of libraray to project settings.
#pragma comment(lib, "fortran_library_name")

extern "C"
{
    // Functions exported by fortran_library_name and used in this program.
    // Note that function names may be all upper case.
    // The function name may be also exported with a leading underscore.
    // You can see the names in the DependencyWalker.
    void __stdcall some_fortran_lib_func1();

    // Another example with Fortran code
    // REAL*8 FUNCTION SOME_FORTRAN_LIB_FUNC2 (a, b)
    // REAL*8 a [VALUE]
    // REAL*8 b [REFERENCE]
    // b = SQRT(a)
    // SOME_FORTRAN_LIB_FUNC2 = a * a
    // END
    double __stdcall SOME_FORTRAN_LIB_FUNC2(double f, double *p);
}

int main()
{
    some_fortran_lib_func1();
    // Print result here if functions returns a value or modfies parameters 
    return 0;
}

Use the above code snippet to try first with a simple function (few parameters). If that works proceed with all functions declaring and testing them for correct results (I assume that most - if not all - are just doing some calculations).

manoharbalu9-Jun-16 3:36

manoharbalu

9-Jun-16 3:36

What if I want to change the Fortran Library function code?

If I have to change it in the Fortran Library source and rebuild in the old setup, then I require to change all my Fortran Source to be converted to C++.

Please consider my above requirement too. How to do modifications and build library files from the Fortran library source without using Fortran compiler in VS97 setup?