Page TOC-19
Programs that simulate a sequence of stack operations, 21-17
Interactive input in programs, 21-19
Prompt with an input string, 21-21
A function with an input string, 21-22
Input string for two or three input values, 21-24
Input through input forms, 21-27
Creating a choose box, 21-31
Identifying output in programs, 21-33
Tagging a numerical result, 21- 33
Decomposing a tagged numerical result into number and tag, 21-33
“De-tagging” a tagged quantity, 21-33
Examples of tagged output, 21-34
Using a message box, 21-37
Relational and logical operators, 21-43
Relational operators, 21-43
Logical operators, 21-44
Program branching, 21-46
Branching with IF, 21-46
The CASE construct, 21-51
Program loops, 21-53
The START construct, 21-53
The FOR construct, 21-59
The DO construct, 21-61
The WHILE construct, 21-62
Errors and error trapping, 21-64
DOERR, 21-64
ERRN, 21-64
ERRM, 21-65
ERR0, 21-65
LASTARG, 21-65
Sub-menu IFERR, 21-65
User RPL programming in algebraic mode, 21-66
Chapter 22 - Programs for graphics manipulation, 22-1
The PLOT menu, 22-1
User-defined key for the PLOT menu, 22-1
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