Thread: how to use math functions in g++

  1. #1
    Registered User
    Join Date
    Oct 2006

    how to use math functions in g++

    #include <math>
    gives error on linux compiler g++
    can anybody guide how functions like sqrt() are to be used

  2. #2
    Registered User
    Join Date
    Mar 2008
    try #include <cmath>

    c libraries start with an extra c in c++(ie cmath, cstdio, ctime)

  3. #3
    Registered User
    Join Date
    Jun 2005
    The correct header from C is <math.h>. This is deprecated in C++ so <cmath> should be used instead (in which case math functions like sqrt() will live in namespace std).

    The other usual requirement (assuming you have #include'd required headers) is to add -lm to the command line when linking, so as to link functions from the math library into the executable.

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