HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 682

the commands "Operation cancelled" MSGBOX will show a message box indicating that the operation was cancelled. Identifying output in programs The simplest way to identify numerical program output is to "tag" the program results. A tag is simply a string attached to a number, or to any object. The string will be the name associated with the object. For example, earlier on, when debugging programs INPTa (or INPT1) and INPT2, we obtained as results tagged numerical output such as :a:35. Tagging a numerical result To tag a numerical result you need to place the number in stack level 2 and the tagging string in stack level 2, then use the →TAG function („ ° @)TYPE@ @ TAG) For example, to produce the tagged result B:5., use: 5`,Õ~b„ ° @)TYPE@ @ TAG Decomposing a tagged numerical result into a number and a tag To decompose a tagged result into its numerical value and its tag, simply use function OBJ („°@)TYPE@ @OBJ @). The result of decomposing a tagged number with →OBJ is to place the numerical value in stack level 2 and the tag in stack level 1. If you are interested in using the numerical value only, then you will drop the tag by using the backspace key ƒ. For example, decomposing the tagged quantity B:5 (see above), will produce: "De-tagging" a tagged quantity "De-tagging" means to extract the object out of a tagged quantity. This function is accessed through the keystroke combination: „ ° @)TYPE@ L @DTAG. For example, given the tagged quantity a:2, DTAG returns the numerical value 2. Page 21-33