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I use scanf_s to input data.
It causes compiler error on OnlineJudge, while scanf can pass the test.
I've included cstdio.
Is scanf_s included in other STLs?
As Govind Parmar stated in his comment, scanf_s is a Microsoft extension. OnlineJudge uses GNU C++ compilers, and thus, using Microsoft extensions will not work.
Helpful note: if you'd like to test your code on a standard compiler before submitting, there are several available online, such as ideone.
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I've been working on some C++ code that a friend has written and I get the following error that I have never seen before when compiling with gcc11.1:
enter image description here
enter image description here
Generally speaking, what does this error mean? What should I be looking for when this type of error occurs?
I have tried to compile with several versions of gcc, but without much success
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i am unable to do an Exception Handling program in C++ in my MS DOS & Turbo c Compilers. can i have suggestions or any needful statements for that?
Some fatal error of program
program code
To use exceptions, you need to use a compiler that supports exceptions. Turbo C++ compiler does not support exceptions.
To use Turbo C++, you must not use exceptions.
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I having trouble understanding why it won't identify this.
Any help is greatly appreciated.
Errors
Rest of the Code
This is C++17 syntax. As this standard is not yet the default option for most compilers you have to tell the compiler that you are using it via the -std=c++17 switch.
PS: you didn't say which compiler you are using, so maybe it will not support that switch or not even support C++17 at all.
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Can I use __forceinline in .cpp file wtih VS 2013?
From this manual's examples it seems to be possible
http://msdn.microsoft.com/en-us/library/z8y1yy88.aspx . But I want to be sure.
Yes you can, and it's actually enforced really well (unlike gcc/clang etc, where __attribute__((always_inline)) is unfortunatly still optional for the compiler, depending on multiple other compiler flag settings).
The keyword works in all versions of Visual Studio.
I read the link you gave. The page does explicitly say it is for VS 2013. Try it out and step through the code with the debugger to be certain.
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I need to use calcstar that is math expression evaluator...
I just simply include calcstar.h file and it include everything else
#include "calcstar.h"
but when I try to compile my code i get this error:
size_t redefined
This error appears inside calcstar's own files...but the point is that this library is published online so I assume it is tested and doesn't have a bug...
What is the problem? Am I doing something wrong?
I really need a mathematical expression evaluator for my project.
CalcStar, assuming you got it from here, was apparently developed using Visual Studio 2008 (the download file name is CalcStarApp_VS2008_03202014.zip.).
One of the quirks of Visual Studio is that it allows redefinition of typedefs. Other compilers (like the one you appear to be using) do not.
You'll need to modify code appropriately.