User manual HP 12C FINANCIAL PROGRAMMABLE CALCULATOR

[. . . ] hp 12c financial calculator user's guide H Edition 4 HP Part Number 0012C-90001 File name: hp 12c_user's guide_English_HDPMBF12E44 Printed Date: 2005/7/29 Page: 1 of 209 Dimension: 14. 8 cm x 21 cm Notice REGISTER YOUR PRODUCT AT: www. register. hp. com THIS MANUAL AND ANY EXAMPLES CONTAINED HEREIN ARE PROVIDED "AS IS" AND ARE SUBJECT TO CHANGE WITHOUT NOTICE. HEWLETT-PACKARD COMPANY MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MANUAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE. SHALL NOT BE LIABLE FOR ANY ERRORS OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING, PERFORMANCE, OR USE OF THIS MANUAL OR THE EXAMPLES CONTAINED HEREIN. © Copyright 1981, 2004 Hewlett-Packard Development Company, L. P. [. . . ] If the calculator is already in Run mode (that is, the PRGM status indicator in the display is not lit), skip this step. Key any required data into the calculator, just as if you were calculating manually. When a program is run, it uses the data already keyed into the display and the registers inside the calculator. Press t to begin program execution. File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 89 of 209 Dimension: 14. 8 cm x 21 cm 90 Section 8: Programming Basics Example: Run the program created above to calculate the net cost of a typewriter listing for $625 and an executive chair listing for $159. Keystrokes fs 625 t 159 t Display 155. 00 625. Display shows number previously calculated. Net cost of chair. That's all there is to creating and running simple programs!But if you want to use programs frequently, you'll want to know more about programming -- such as how to check what keystrokes are stored in program memory, how many keystrokes can be stored in program memory, how to correct or otherwise modify programs, how to skip keystrokes when running a program, and so on. Before you can understand these aspects of programming, we need to briefly discuss how keystrokes are treated by the calculator when they are stored in Program mode and when they are executed in Run mode. Program Memory Keystrokes entered into the calculator in Program mode are stored in program memory. Each digit, decimal point, or function key is called an instruction and is stored in one line of program memory -- usually referred to simply as a program line. Keystroke sequences beginning with the f, g, ?, :, and i prefix keys are considered to comprise a complete instruction and are stored in only one program line. When a program is run, each instruction in program memory is executed -- that is, the keystroke in that program line is performed, just as if you were pressing the key manually -- beginning with the current line in program memory and proceeding sequentially with the higher-numbered program lines. Whenever the calculator is in Program mode (that is, whenever the PRGM status indicator in the display is lit), the display shows information about the program line to which the calculator is currently set. At the left of the display is the number of the program line within program memory. The remaining digits in the display comprise a code that indicates what instruction has been stored in that program line. No code is shown for program line 00, since no regular instruction is stored there. File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 90 of 209 Dimension: 14. 8 cm x 21 cm Section 8: Programming Basics 91 Identifying Instructions in Program Lines Each key on the hp 12c keyboard -- except for the digit keys 0 through 9 -- is identified by a two-digit "keycode" that corresponds to the key's position on the keyboard. The first digit in the keycode is the number of the key row, counting from row 1 at the top; the second digit is the number of the key in that row, counting from 1 for the first key in the row through 9 for the ninth key in the row and 0 for the tenth key in the row. The keycode for each digit key is simply the digit on the key. Thus, when you keyed the instruction b into program memory, the calculator displayed 04­ 25 This indicates that the key for the instruction in program line 04 is in the second row on the keyboard and is the fifth key in that row: the b key. When you keyed the instruction + into program memory, the calculator displayed 07­ 40 This indicates that the key for the instruction in program line 07 is in the fourth row on the keyboard and is the tenth key in that row: the + key. When you keyed the digit 5 into program memory, the keycode displayed was only the digit 5. Since keystroke sequences beginning with f, g, ?, :, and i are stored in only one program line, the display of that line would show the keycodes for all the keys in the keystroke sequence. Instruction gÒ ?=1 gi00 Keycode nn- 43 26 1 nn- 44 40 nn- 43, 33 00 File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 91 of 209 Dimension: 14. 8 cm x 21 cm 92 Section 8: Programming Basics Displaying Program Lines Pressing fs to set the calculator from Run mode to Program mode displays the line number and keycode for the program line to which the calculator is currently set. [. . . ] Does not erase program memory. 206 File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 206 of 209 Dimension: 14. 8 cm x 21 cm Programming Key Index 207 Program Mode Active Keys: Run Mode Pressed from keyboard: t Run/Stop. Stops execution if program is running (page 89). Executed as a recorded program instruction: t Run/Stop. Followed by a two-digit number, causes calculator to branch to the specified line number next, and resumes program execution from there (page 103). [. . . ]