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-.TH PFC 1 pfc\-VERSION
-.SH NAME
-pfc \- postfix calculator
-.SH SYNOPSIS
-.B pfc
-.SH DESCRIPTION
-pfc is an interactive postfix, or reverse Polish notation, calculator.
-.
-.SH USAGE
-.
-.SS Keyboard commands
-.
-.TP
-.B Shift-q
-Quit.
-.
-.TP
-.B [0..9]
-Enter a digit into the input buffer.
-pfc works with floating point numbers so the
-.B .
-character is OK as well.
-.
-.TP
-.B Backspace
-Remove a digit from the input buffer.
-.
-.TP
-.B Enter
-Push the number in the input buffer to the stack.
-.
-.TP
-.B Shift-j
-Swap the bottom (most recently pushed) item on the stack with the input buffer.
-If the input buffer is empty this simply moves the most recently pushed item
-back into the input buffer.
-.
-.TP
-.B Shift-k
-The same as
-.BR Shift-j .
-.
-.TP
-.B Shift-d
-Delete the contents of the input buffer.
-.
-.TP
-.B Shift-c
-Delete the contents of the input buffer and the stack.
-.
-.TP
-.B Shift-a
-Toggle between degree and radian mode.
-.
-.TP
-.B Shift-n
-Negation. If there is a number in the buffer, negate it. Otherwise, negate the
-bottom number in the stack.
-.
-.SS Operators
-.
-.TP
-.B +
-Addition.
-.
-.TP
-.B -
-Subtraction.
-.
-.TP
-.B *
-Multiplication.
-.
-.TP
-.B /
-Division.
-.
-.TP
-.B %
-Modulo/remainder.
-.
-.TP
-.B ^
-Exponentiation.
-.
-.SS Functions
-.
-.TP
-.B sin
-Sine function.
-.
-.TP
-.B cos
-Cosine function.
-.
-.TP
-.B tan
-Tangent function.
-.
-.TP
-.B asin
-Inverse sine function.
-.
-.TP
-.B acos
-Inverse cosine function.
-.
-.TP
-.B atan
-Inverse tangent function.
-.
-.TP
-.B deg
-Convert radians to degrees.
-.
-.TP
-.B rad
-Convert degrees to radians.
-.
-.SS Constants
-.
-.TP
-.B pi
-Archimedes’ constant (π).
-.
-.TP
-.B e
-Euler’s number (e).