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Asked: 2026-05-26T02:40:09+00:00

I am working with the Borland Turbo C++ compiler in a WINDOWS machine, and

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I am working with the Borland Turbo C++ compiler in a WINDOWS machine, and wrote a piece of code in C.

I want to use the complementary error function erfc() for one of my calculations.

However, when I run the code, the error is
“Linker error: Undefined symbol _erfc in in module filename.c “

The problem here is erfc() and erf() are supposed to be included in the math.h library.
However, these aren’t available in mine.

Can anyone please tell me how I can include these functions in my program ?

Thank you

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1 Answer

  1. Editorial Team

    It’s likely that you need to pass some special option to link to the math library.

    It’s also possible that Borland Turbo C++ doesn’t support the erfc() function.

    In C, the 1990 ISO C standard didn’t include the erfc() function. It was added to the language by the 1999 standard. (I’m not sure about C++.) I think that Borland Turbo++ is fairly old.

    Try writing a small program that calls sqrt(). If you can get that to work, and erfc() is still unrecognized, then Borland doesn’t support it.

    In the latter case, either get a newer compiler (there are a number of free ones, and that’s probably a good idea in any case), or find an open source implementation of erfc().

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