HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 651
Global and local variables and subprograms, a global variable
UPC - 829160013183
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„´@)HYP @SINH 1#~„x MTH@ @LIST @ADD@ / [']~„x™ „°@)@MEM@@ @)@DIR@@ @PURGE SINH 1 x SQ ADD / 'x' PURGE __________ Calculate sinh of level 1 Enter 1 and calculate x2 Calculate (1+x2), then divide Purge variable x Program in level 1 To save the program use: [']~„gK Press J to recover your variable menu, and evaluate g(3.5) by entering the value of the argument in level 1 (3.5`) and then pressing @@@g@@@. The result is 1.2485..., i.e., g(3.5) = 1.2485. Try also obtaining g({1 2 3}), by entering the list in level 1 of the display: „ä1#2#3` and pressing @@@g@@@. The result now is {SINH(1)/2 SINH(2)/5 SINH(3)/10}, if your CAS is set to EXACT mode. If your CAS is set to APPROXIMATE mode, the result will be {0.5876.. 0.7253... 1.0017...}. Global and local variables and subprograms The program @@@g@@@, defined above, can be displayed as « 'x' STO x SINH 1 x SQ ADD / 'x' PURGE » by using ,@@@g@@@. Notice that the program uses the variable name x to store the value placed in level 1 of stack through the programming steps 'x' STO. The variable x, while the program is executing, is stored in your variable menu as any other variable you had previously stored. After calculating the function, the program purges (erases) the variable x so it will not show in your variable menu after finishing evaluating the program. If we were not to purge the variable x within the program its value would be available to us after program execution. For that reason, the variable x, as used in this program, is referred to as a global variable. One implication of the use of x as a global variable is that, if we had a previously defined a variable with the name x, its value Page 21-2
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