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Improve string and printing documentation

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Updated the help files help/config, help/display, help/epsilon,
help/fprint, help/printf, and help/strprintf to give more
examples of how display digits and epsilon precision interact
with displaying values.

Added more information about %g in the help file help/printf.

The '\a' is now recognized in a printf format string as the
single byte audible bell character (byte 0x07 in ASCII encoding).

The following is a partial list of escape sequences recognized
in strings and in printf formats:

    \a      audible bell    byte 0x07 in ASCII encoding
    \b      backspace       byte 0x08 in ASCII encoding
    \f      form feed       byte 0x0c in ASCII encoding
    \n      newline         byte 0x0b in ASCII encoding
    \r      return          byte 0x0a in ASCII encoding
    \t      tab             byte 0x0d in ASCII encoding
    \v      vertical tab    byte 0x09 in ASCII encoding
This commit is contained in:
Landon Curt Noll
2018-11-04 17:00:15 -08:00
parent 1cdb5172d8
commit 81a4a4f828
7 changed files with 348 additions and 34 deletions
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46
help/config
View File

@@ -949,6 +949,48 @@ EXAMPLE
; display()
50
; /*
* NOTE: When displaying many digits after the decimal point
* be sure to set display(digits) (see 'help display') to
* large enough AND to set epsilon(eps) (see 'help epsilon')
* small enough (or if the function has a esp argument,
* give a eps argument that is small enough) to display
* the value correctly.
*/
; config("tilde", 1),;
; /* NOTE: display has too few digits and epsilon is not small enough */
; config("display", 12),; /* or display(12),; */
; printf("%f\n", pi(1e-10));
3.1415926536
; config("epsilon", 1e-10),; /* or epsilon(1e-10),; */
; printf("%f\n", pi());
3.1415926536
; /* NOTE: display has too few digits yet epsilon is small enough */
; config("display", 12),; /* or display(12),; */
; printf("%f\n", pi(1e-72));
~3.141592653590
; config("epsilon", 1e-72),; /* or epsilon(1e-72),; */
; printf("%f\n", pi());
~3.141592653590
; /* NOTE: display has enough digits but epsilon is not small enough */
; config("display", 72),; /* or display(72),; */
; printf("%f\n", pi(1e-10));
3.1415926536
; config("epsilon", 1e-10),; /* or epsilon(1e-10),; */
; printf("%f\n", pi());
3.1415926536
/* NOTE: display has enough digits and epsilon is small enough */
; config("display", 72),; /* or display(72),; */
; printf("%f\n", pi(1e-72));
3.141592653589793238462643383279502884197169399375105820974944592307816406
; config("epsilon", 1e-72),; /* or epsilon(1e-72),; */
; printf("%f\n", pi());
3.141592653589793238462643383279502884197169399375105820974944592307816406
LIMITS
none
@@ -956,9 +998,9 @@ LINK LIBRARY
n/a
SEE ALSO
usage, custom, custom_cal, usage, epsilon, display
custom, custom_cal, display, epsilon, fprintf, printf, strprintf, usage
## Copyright (C) 1999-2007 Landon Curt Noll
## Copyright (C) 1999-2007,2018 Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License