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Hi guys,
When i first started learning programming language(ofcourse C!!) in my college I used to practice it on turboc compiler, Now a days we are using visual studio and online compilers and I found myself that the program which is executed in turboc without any error will show up with an error/s or warning/s in visual studio, if I made the necessary corrections to the program in order to execute it in visual studio with out any errors, it show will show up with errors on using online compiler why is that happening??, what is the difference between them??, why couldn't they execute the same program(say C program) which is already error free in other compilers??
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Usually because the compilers are different levels, or do not implement the full standards properly. TurboC is very old and most likely allows things that Microsoft's C compiler (not Visual Studio) does not. As to online compilers you would need to check their details.
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Thanks a lott..I think ur answer should help me.
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That happens most likely when using non standard functions from compiler specific libraries (defined in corresponding header files). The Turbo-C and Microsoft compilers are only available for DOS resp. Windows and provide therefore some OS specific functions. Online compilers are usually not OS specific and will therefore only support standard C.
The C standard itself has also been changed with time. So recent compilers using a newer standard may issue warnings or errors for code that was tolerable with older standards. However, these compilers usually have an option to compile code using the C89/C90 standard.
A short overview of the C standard history:
- K&R, 1978
- ANSI C / C89, 1989
- ISO C / C90, 1990; basically the same as C89
- C99
- C11
So C code conforming to the standards should compile with all compilers supporting that standard and when selecting an older standard if necessary.
But code conforming to the C standard is rather rare. Most code will use some OS specific functions like POSIX on Unix systems and the DOS specific functions with DOS/Windows compilers.
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thank u 
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Jochen Arndt answer is almost spot on. The only thing I would add is on many compilers they have command line flags you can use to set the standard of C you want or need.
On GCC compilers for example it's the -std flag .... -std=c89 makes it compile with c89 standard etc. On visual studio it's under the compiler settings options on your project settings.
So if you have old code you know the standard it was written with you can just ask the compiler to use that standard. Really old code you can basically guess is going to be C89 and selecting that will remove many of the warnings and errors that won't be accepted by the newer standards.
The newer standards stop some old coding styles that were considered dangerous either from the programmer making a mistake or hackers exploiting with things like buffer overruns. The newer standards also have some new features in the language the old syntax won't understand.
So if you are writing new code you should write to the newest standard your compiler accepts. If you just need to compile an old code just change the compiler standard back to what you need or else you must correct the code to the newer standard. On large code libraries that can be a daunting task and so usually you take the standard change option.
In vino veritas
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Oh Thanks....
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Price.
(oh, and usefulness)
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I am writing code for an embedded ARM processor and I am compiling with GNU GCC. I want to do the following:
#define PA0 GPIOA, GPIO_PIN0
#define PIN_DEF(PORT, PIN) \
GPIO_TypeDef* PORT; \
uint16_t PIN;
PIN_DEF(PA0)
However, I get an error message saying PIN_DEF requires 2 arguments but I'm only giving it 1. Does anybody know how to solve this?
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You have defined it as PIN_DEF(PORT, PIN), so it requires two parameters. Either change the definition, or provide the second parameter. You could try
#define PA0 (GPIOA, GPIO_PIN0)
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The generic answer is you can use __VA_ARGS__ its used to pass variable arguments thru macros, something like this is generally how it used to feed a multi variable function
#define LOG_DEBUG(...) printf(__VA_ARGS__)
For what you are doing you pass the arguments thru two macros the first take any number of variables the second macro enforces it is using just two values.
#define PA0 GPIOA, GPIO_PIN0
#define PIN_DEF_A(A, B) \
GPIO_TypeDef* PORT; \
uint16_t PIN;
#define PIN_DEF(...) PIN_DEFA(__VA_ARGS__)
Your code doesn't make a lot of sense to me because I can't see the types. I am guessing GPIO_TypeDef* is a volatile to a 16 bit port and what you are trying to do is MACRO the output of a 16 bit value which would usually look actually like this
*((volatile uint16_t*) 0xXXXXXXXXX = 0x????;
*((volatile uint16_t*) 0x3F000000) = 0x1234;
Using the above macro form for that would be
#define PA0 0x3F000000,0x1234
#define PIN_DEFA(A, B) *((volatile uint16_t*) (A)) = (B)
#define PIN_DEF(...) PIN_DEFA(__VA_ARGS__)
PIN_DEF(PA0);
In vino veritas
modified 2-Mar-17 8:27am.
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How to include run a program on devc++ when i have my own .h file..i have my own headerfile, but when i run my main.cpp it says, no such file or directory
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For the header files that are not shipped with compiler as library, you need to specify where to look for. The code for,
#include "myheader.h"
Looks for in the same directory, or the directory of your project to find the header files. Remember, Dev C++ primarily is a port of GCC compiler, so every concept of GCC can be applied here similarly. GCC works fine with
* projectdirectory
|- program.c
|- myheader.h
#include "myheader.h"
int main() {
}
Also, remember that the "own headerfile" should not be written in angle brackets, they should be in quotations. For more on this please read,
http://stackoverflow.com/questions/257795/header-files-in-dev-c
http://gcc.gnu.org/onlinedocs/cpp/Search-Path.html#Search-Path
The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~
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Please edit your question adding some more information (code snippet and indication where the error occurs, exact error message).
So I can only guess that you have something like
#include "myheader.h"
int main()
{
return 0;
}
If the error is something like "myheader.h: No such file or directory" you have to tell the compiler which directories should be searched for include files.
Because Dev-C++ uses the GCC compiler, it can be done using the command line option -I.
I don't use Dev-C++ but a quick research shows that there is a project option to specifiy additional pathes at Project - Options - Directories - Include.
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Member 11855697 wrote: ...but when i run my main.cpp it says, no such file or directory
What in the world is this supposed to mean? How do you run a .cpp file?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Hi
while moving my code over from VS 2012 Windows 8.1 to Windows 10 VS 2015
I got the following error
error C3861: 'RegGetValue': identifier not found
I have included WinReg.h yet intellisense points me to SHRegGetValue
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Have you looked at Winreg.h to check that it is defined in there, and also not excluded by some #define block?
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ForNow wrote: I have included WinReg.h yet intellisense points me to SHRegGetValue
define _WIN32_WINNT as 0x0600 or later.
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Hello,
I am working on a windows Forms Application (C++) Programm in Visual Studio 2015.
I have figured out how to open a file. And read from it.
But what I can't figure out is how to only read the second line or the second row from my file (.cvs file).
What I am looking for is the syntax to use instead of RealAllText.
I looked up the Objectkatalog. But I can't get "ReadLine" to work.
My code is posted below.
I really hope someone can help me
Kind regards
private: System::Void button6_Click_1(System::Object^ sender, System::EventArgs^ e) {
Stream^ myStream;
OpenFileDialog^ openFileDialog1 = gcnew OpenFileDialog;
if (openFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::OK)
{
if( (myStream = openFileDialog1->OpenFile()) != nullptr )
{
String^ strfilename = openFileDialog1->InitialDirectory + openFileDialog1->FileName;
String^ Readfile = File::ReadAllText(strfilename);
Malz4->Text = Readfile;
myStream->Close();
}
}
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Hey, thanks for your help but I still can't get my code to work.
I typed in your suggestion but maybe I am doing a sytax error?
I am a beginner so that might be the case  haha
And how would I get the second column out?
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Without seeing your code it is impossible to comment.
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If ReadAllText() returns a sequence, could you then call First() twice on that sequence?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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I am using a bitmap for a dialog background, which works fine.
I am also doing some GDI drawing on top of the bitmap.
The problem is updating the GDI drawing causes the bitmap to blink. On a slower computer this may be a major annoyance.
The bitmap is loaded in the OnPaint() message handler, where the GDI drawing is also performed and updated.
I have tried loading the bitmap image only once, but when the GDI drawing is updated, the bitmap background is erased and not replaced.
Is it possible to load the bitmap once, and not have it erased in OnPaint() when the GDI drawing is updated?
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Have you tried to not call default OnEraseBackground ?
Something like that:
BOOL CYourDlg::OnEraseBkgnd(CDC* pDC)
{
return TRUE;
}
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