HP 12C Financial Programmable Calculator Podręcznik Użytkownika Pobierz pdf (Strona 108)

108 Section 9: Branching and Looping

File name: hp 12c_user's guide_English_HDPMBF12E44 Page: 108 of 209

Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm

The program line immediately following that containing the conditional test

instruction can contain any instruction; however, the most commonly used

instruction there is

. If a

instruction follows a conditional test instruction,

program execution branches elsewhere in program memory if the condition is true

and continues with the next line in program memory if the condition is false.

Example:

The following program calculates income tax at a rate of 20% on

incomes of $20,000 or less and 25% on incomes of more than $20,000. To

conserve program lines, the program assumes that the test value — 20,000 — has

been stored in register R

and the tax rates — 20 and 25 — have been stored in

registers R

and R

, respectively.

Note: If a program requires that certain numbers be in the X- and

Y-registers when instructions such as o are executed, it is extremely helpful

when writing the program to show the quantities in each register after each

instruction is executed, as in the following diagram.

1 2 ... 103 104 105 106 107 108 109 110 111 112 113 ... 210 211

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HP 12C Financial Programmable Calculator Podręcznik Użytkownika Strona 108