DOKK / manpages / debian 12 / avr-libc / M_E.3avr.en
avr_math(3avr) avr-libc avr_math(3avr)

avr_math - <math.h>: Mathematics


#define M_E 2.7182818284590452354 

#include <math.h>

This header file declares basic mathematics constants and functions.

Notes:

  • In order to access the functions declared herein, it is usually also required to additionally link against the library libm.a. See also the related FAQ entry.
  • Math functions do not raise exceptions and do not change the errno variable. Therefore the majority of them are declared with const attribute, for better optimization by GCC.

The constant e.

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Fri Jan 7 2022 Version 2.0.0