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rpn.1: fixed some clunky stuff

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Emma Tebibyte 2024-02-07 19:11:53 -07:00
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1 changed files with 9 additions and 8 deletions
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@ -21,16 +21,16 @@ Rpn parses and and evaluates reverse polish notation expressions either from the
standard input or by parsing its arguments. See the STANDARD INPUT section. standard input or by parsing its arguments. See the STANDARD INPUT section.
Upon evaluation, rpn will print the resulting number on the stack to the Upon evaluation, rpn will print the resulting number on the stack to the
standard output. Any further specified numbers will be placed on the stack standard output. Any further specified numbers will be placed at the end of the
following the last outputted number. stack.
For information on for reverse polish notation syntax, see rpn(7). For information on for reverse polish notation syntax, see rpn(7).
.SH STANDARD INPUT .SH STANDARD INPUT
If rpn is passed arguments, it interprets them as an expression to be evaluated. If arguments are passed to rpn, it interprets them as an expression to be
Otherwise, it reads whitespace-delimited numbers and operations from the evaluated. Otherwise, it reads whitespace-delimited numbers and operations from
standard input. the standard input.
.SH DIAGNOSTICS .SH DIAGNOSTICS
@ -42,13 +42,14 @@ as defined by sysexits.h(3) and print an error message.
Due to precision constraints and the way floats are represented in accordance Due to precision constraints and the way floats are represented in accordance
with the IEEE Standard for Floating Point Arithmetic (IEEE 754), floating-point with the IEEE Standard for Floating Point Arithmetic (IEEE 754), floating-point
arithmetic has rounding errors. This is somewhat curbed by using the arithmetic has rounding errors. This is somewhat curbed by using the
second-highest float that can be represented in line with this standard to round machine epsilon as provided by the Rust standard library to which to round
numbers to before outputting. numbers. Because of this, variation is expected in the number of decimal places
rpn can handle based on the platform and hardware of any given machine.
.SH RATIONALE .SH RATIONALE
An infix notation calculation utility, bc(1p), is included in the POSIX An infix notation calculation utility, bc(1p), is included in the POSIX
standard, but it doesn’t accept expressions as arguments; in scripts, any standard, but does not accept expressions as arguments; in scripts, any
predefined, non-interactive input must be piped into the program. A dc(1) predefined, non-interactive input must be piped into the program. A dc(1)
pre-dates the standardized bc(1p), the latter originally being a preprocessor pre-dates the standardized bc(1p), the latter originally being a preprocessor
for the former, and was included in UNIX v2 onward. While it implements reverse for the former, and was included in UNIX v2 onward. While it implements reverse