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.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.
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