HP 15C Instrukcja Użytkownika Pobierz pdf (Strona 102)

102 Section 9: Subroutines

Subroutine Limits

A subroutine can call up another subroutine, and that subroutine can call up

yet another subrout   the execution of a

subroutine within a subroutineis limited to stack of subroutines seven

levels deep (this does not count the main program level). The operation of

nested subroutines is as shown below:

Main Program

End

Examples

Example: Write a program to

calculate the slope of the secant line

joining points (x

, y

) and (x

, y

) on

the graph shown, where y = x

- sin x

(given x in radians).

The secant slope is:

)sin ()sin (

or ,

xxxx







The solution requires that the equation for y be evaluated twiceonce for y

and once for y

, given the data input for x

and x

. Since the same

calculation must be made for different values, it will save program space to

call a subroutine to calculate y.

The following program assumes that x

has been entered into the Y-register

and x

into the X-register.

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 287 288

Brak uwag

HP 15C Instrukcja Użytkownika Strona 102