GNU Emacs Calc 2.02 Manual
15.2 Yanking into the Stack
The C-y command yanks the most recently killed text back into the
Calculator. It pushes this value onto the top of the stack regardless of
the cursor position. In general it re-parses the killed text as a number
or formula (or a list of these separated by commas or newlines). However if
the thing being yanked is something that was just killed from the Calculator
itself, its full internal structure is yanked. For example, if you have
set the floating-point display mode to show only four significant digits,
then killing and re-yanking 3.14159 (which displays as 3.142) will yank the
full 3.14159, even though yanking it into any other buffer would yank the
number in its displayed form, 3.142. (Since the default display modes
show all objects to their full precision, this feature normally makes no
difference.)
