HP 32Sii HP 32Sii RPN Scientific Calculator - (English) Owner Manual - Page 42

Exchanging the X- and Y-Registers in the Stack Another key that manipulates the stack contents is Z (x exchange y). This key swaps the contents of the X- and Y-registers without affecting the rest of the stack. Pressing Z twice restores the original order of the X- and Y-register contents. The Z function is used primarily for two purposes: To view the contents of the Y-register and then return them to y (press Z twice). Some functions yield two results: one in the X-register and one in the Y-register. For example, z q converts rectangular coordinates in the X- and Y-registers into polar coordinates in the X- and Y-registers. To swap the order of numbers in a calculation. For example, one way to calculate 9 ÷ (13 × 8): Press 13 š 8 y 9 Z p The keystrokes to calculate this expression from left-to-right are: 9 š 13 š 8 y p Note Always make sure that there are no more than four numbers in the stack at any given time - the contents of the T-register (the top register) will be lost whenever a fifth number is entered. Arithmetic-How the Stack Does It The contents of the stack move up and down automatically as new numbers enter the X-register (lifting the stack) and as operators combine two numbers in the X- and Y-registers t o produce one new number in the X-register (dropping the stack). Suppose the stack is filled with the numbers 1, 2, 3, and 4. See how the stack drops and lifts its contents while calculating 2-4 The Automatic Memory Stack File name 32sii-Manual-E-0424 Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm