HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 61
Recall Arithmetic, Result: 15, that is,
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A 15 Tt Zz Yy X3 A 12 Result: 15 3 that is,A x T t Z z Y y X 3 Recall Arithmetic Recall arithmetic uses L , L , L z, or L q to do arithmetic in the X-register using a recalled number and to leave the result in the display. Only the X-register is affected. New x = Previous x Variable For example, suppose you want to divide the number in the X-register (3, displayed) by the value in A(12). Press L q A. Now x = 0.25, while 12 is still in A. Recall arithmetic saves memory in programs: using L A (one instruction) uses half as much memory as L A, (two instructions). A 12 A 12 Tt Zz Yy X3 Tt Zz Yy X 0.25 Result: 3 12 that is, x 12 Example: Suppose the variables D, E, and F contain the values 1, 2, and 3. Use storage arithmetic to add 1 to each of those variables. Storing Data into Variables 3-5