[Bug 1805003] [NEW] precision for floating number fails after 15th decimal

[kenn]

Public bug reported:

I noticed that gawk floating number calculator function (mpfr_atan2)
prints wrong numbers after 15th decimal.

The following gawk command prints pi:

`awk 'BEGIN {  x = 1;  y = 1;  result = 4*atan2 (y,x);  printf " %.20f
degrees\n", result}'`

`3.14159265358979311600 degrees`

But it must be `3.14159265358979323846`

** Affects: gawk (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  precision for floating number fails after 15th decimal

Status in gawk package in Ubuntu:
  New

Bug description:
  I noticed that gawk floating number calculator function (mpfr_atan2)
  prints wrong numbers after 15th decimal.

  The following gawk command prints pi:

  `awk 'BEGIN {  x = 1;  y = 1;  result = 4*atan2 (y,x);  printf " %.20f
  degrees\n", result}'`

  `3.14159265358979311600 degrees`

  But it must be `3.14159265358979323846`

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