HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 679
Commands IF, THEN, ELSE, END are available, C R S 'C, NUM Q, Operation cancelled MSGBOX
UPC - 829160013183
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Thus, we demonstrated the use of function INFORM. To see how to use these input values in a calculation modify the program as follows: « " CHEZY'S EQN" { { "C:" "Chezy's coefficient" 0} { "R:" "Hydraulic radius" 0 } { "S:" "Channel bed slope" 0} } { } { 120 1 .0001} { 110 1.5 .00001 } INFORM IF THEN OBJ DROP C R S 'C*(R*S)' NUM "Q" TAG ELSE "Operation cancelled" MSGBOX END » The program steps shown above after the INFORM command include a decision branching using the IF-THEN-ELSE-END construct (described in detail elsewhere in this Chapter). The program control can be sent to one of two possibilities depending on the value in stack level 1. If this value is 1 the control is passed to the commands: OBJ DROP C R S 'C*√(R*S)' NUM "Q" TAG These commands will calculate the value of Q and put a tag (or label) to it. On the other hand, if the value in stack level 1 is 0 (which happens when a @CANCEL is entered while using the input box) , the program control is passed to the commands: "Operation cancelled" MSGBOX These commands will produce a message box indicating that the operation was cancelled. Note: Function MSGBOX belongs to the collection of output functions under the PRG/OUT sub-menu. Commands IF, THEN, ELSE, END are available under the PRG/BRCH/IF sub-menu. Functions OBJ , TAG are available under the PRG/TYPE sub-menu. Function DROP is available under the PRG/STACK menu. Functions and NUM are available in the keyboard. Example 2 - To illustrate the use of item 3 (Field format information) in the arguments of function INFORM, change the empty list used in program INFP1 to { 2 1 }, meaning 2, rather than the default 3, columns, and only one tab stop between labels and values. Store this new program in variable INFP2: Page 21-30
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