Source: On-Line Encyclopedia of Integer Sequences (OEIS) pi: http://www.research.att.com/~njas/sequences/A000796 e: http://www.research.att.com/~njas/sequences/A001113 ln(2): http://www.research.att.com/~njas/sequences/A002162 ln(10): http://www.research.att.com/~njas/sequences/A002392
The derived constants have been computed with the GNU Multiple-Precision Library v. 4.2.2.
The constants are listed with a precision that allows a one-line definition.
#include <cpl_math_const.h>