(15C) Parallel Resistance, two resistors

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An excerpt from EDN magazine, HP-15 program needs fewest strokes, Jon Vicklund, 11/OCT/1990, page 242.

"The program in LISTING 1 takes advantage of a Hewlett-Packard RPN calculator's stack operators to calculate the parallel resistance of two resistors using a minimum number of keystrokes.

Listing 1―Minimal-keystroke parallel-resistance
              calculation for HP-15 calculator
R₁                            ; R₁ value
ENTER↑ ENTER↑         ; press enter twice
R₂                            ; R₂ value
ENTER↑                     ; enter
R↓                            ; roll down
+                             ; add
X↔Y                         ;interchange X, Y
÷                             ; divide Y by X
÷                             ; divide Y by X
Display = REQ"

BEST!
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