(dc.info)Stack Control

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5 Stack Control
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'c'
     Clears the stack, rendering it empty.

'd'
     Duplicates the value on the top of the stack, pushing another copy
     of it.  Thus, '4d*p' computes 4 squared and prints it.

'r'
     Reverses the order of (swaps) the top two values on the stack.
     (This can also be accomplished with the sequence 'SaSbLaLb'.)
     (This command is a GNU extension.)

'R'
     Pops the top-of-stack as an integer N.  Cyclically rotates the top
     N items on the updated stack.  If N is positive, then the rotation
     direction will make the topmost element the second-from top; if N
     is negative, then the rotation will make the topmost element the
     N-th element from the top.  If the stack depth is less than N then
     the entire stack is rotated (in the appropriate direction), without
     any error being reported.  (This command is a GNU extension.)