Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 67)

RPBASIC-52 PROGRAMMING GUIDE

2-48

INPUT

Syntax: INPUT ["prompt text"] [,] [,variable ...]

Where: prompt text = optional text

variable = list of variables to assign

Function: Program pauses to receive data entered from the console input.

Mode: Run

Use: 100 INPUT "Enter batch number",$(0)

Cards: All

DESCRIPTION

INPUT brings in numeric and string data from the console serial port during execution. Variables are string,

numeric, or both. Variables are separated by a comma. Optional prompt text must be enclosed i n quotes.

When an optional com ma precedes the first variable, the question mark prompt character is suppressed and

data entry is on the same line as prompt text.

Multiple numeric data may be entered by separating individual values with commas and using <cr> on the

last one. Or, ea ch dat a entry may be entered using a < cr>.

Strings must be entered with a carriage return.

If you do not enter enough data or the correct type, Basic sends the message TRY AGAIN and prompt text

after which you must enter all the data. If you enter too many characters for the size of allocated STRING

memory, or more numeric values than were requested, Basic discards the extra data, emits the message

EXTRA IGNORE D, and continues execution.

There are two major differences betwe en RPBASIC-52 and BA SIC-52 while using INPUT. Input characters

are buffered. The operator or device may "type ahead" into the buffer and INPUT will respond just that much

quicker. The back- space character (A SCII value 08) is recogniz ed in th e same way as the delete key w as.

This makes editing programs more convenient.

COM$, GET, STRING

ERRORS none

EXAMPLE

10 STRING 200,20

20 INPUT "Enter a number, string, and 2 more numbers: ",A,$(0),B,C

30 PRINT "String:",$(0)

40 PRINT "Numbers:",A,B,C

>run

Enter a number, string, and 2 more numbers: 4,Bob

?7,9

String:Bob

4 7 9

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 162 163

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Remote-processing BASIC 52 Uživatelský manuál Strana 67