I want to know how C library implements the sqrt() function. I got the header file math.h in /usr/include. But where is the actual implementation? I am doing a numerical computation project and would like to see the implementations of all the functions available in math.h.
Where are the implementations of the C libraries?
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You'll have a generic answer for your query in this SO thread.
However, to be specific to this question, to get the math related functions, you need to search
libmsource code insideglibc. That is present in the directory namedmath.An online browsable version is available here.