abs function equivalent in c++

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Manu Chaudhary 2022-9-24

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评论： Walter Roberson 2022-9-24

Hi everyone, I am presently struggling with converting a matlab prototype code into a c++ equivalent. I am struggling with the abs function.

What should I do in C++/C to get the similar output?

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Walter Roberson 2022-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/1811170-abs-function-equivalent-in-c#answer_1059725

https://cplusplus.com/reference/cstdlib/abs/

In C++ abs() is overloaded and for double precision will call fabs()

fabs() was not a formal part of C, but it was common for C vendors to provide fabs(). It was common for fabs to be implemented as a macro, but that led to arguments, especially as ieee 754 double precision defines an fabs hardware operation that does not require any branching.

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Manu Chaudhary 2022-9-24

编辑：Manu Chaudhary 2022-9-24

Thank you for great help. Your solution worked.

Walter Roberson 2022-9-24

https://en.cppreference.com/w/cpp/numeric/complex shows the complex class for C++ and shows using a suffix of i for imaginary part, and shows abs() as the function name

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