HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 664

Examples of sequential programming In general, a program is any sequence of calculator instructions enclosed between the program containers " and ». Subprograms can be included as part of a program. The examples presented previously in this guide (e.g., in Chapters 3 and 8) 6 can be classified basically into two types: (a) programs generated by defining a function; and, (b) programs that simulate a sequence of stack operations. These two types of programs are described next. The general form of these programs is input process output, therefore, we refer to them as sequential programs. Programs generated by defining a function These are programs generated by using function DEFINE („à) with an argument of the form: 'function_name(x1, x2, ...) = expression containing variables x1, x2, ...' The program is stored in a variable called function_name. When the program is recalled to the stack, by using ,function_name. The program shows up as follows: « x1, x2, ... 'expression containing variables x1, x2, ...'». To evaluate the function for a set of input variables x1, x2, ..., in RPN mode, enter the variables into the stack in the appropriate order (i.e., x1 first, followed by x2, then x3, etc.), and press the soft menu key labeled function_name. The calculator will return the value of the function function_name(x1, x2, ...). Example: Manning's equation for wide rectangular channel. As an example, consider the following equation that calculates the unit discharge (discharge per unit width), q, in a wide rectangular open channel using Manning's equation: q = Cu n y5/3 0 S0 Page 21-15