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