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HP Calculator Program for Percentage Change Calculation

Create program PCH on HP-41, HP-71B, HP 50g, and HP Prime to calculate % change between two numbers, positive one first. Easy steps and examples included.

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HP Calculator Program for Percentage Change Calculation

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  1. Programming the same task On an HP-41, HP-71B, HP 50g, and HP Prime

  2. Goal:Create a program called PCH whichinputs two numbers (A and B)and returns%Change(A,B)and%Change(B,A)showing the positive one first(or on the bottom of the stack).

  3. Example: Input 4 and 5. Return 25 and -20, because going from 4 to 5 is +25% change, and going from 5 to 4 is -20% change.

  4. HP-41 [GTO] [.] [.] [PRGM] LBL “PCH” X>Y? X<>Y %CH X<>Y LASTX X<>Y %CH X<>Y RDN END [PRGM] 4 [ENTER] 5 [XEQ] “PCH” (or [R/S])

  5. HP-71B EDIT PCH 10 INPUT “A, B? ”;A,B 20 IF A<B THEN VARSWAP A,B 30 DISP 100*(A-B)/A; 40 DISP 100*(B-A)/B 50 END RUN PCH (or just [RUN]) 4,5 [ENTER]

  6. HP 50g « MAX LASTARG MIN %CH LASTARG SWAP %CH » ‘PCH’ STO 4 [ENTER] 5 PCH (or use VAR menu)

  7. HP Prime [Shift] [Program] [New] PCH EXPORT PCH(A,B) BEGIN LOCAL T; T:=MAX(A,B); A:=MIN(A,B); B:=T; RETURN { %CHANGE(A,B), %CHANGE(B,A) }; END; [Home] PCH(4,5) (or use Vars menu)

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