input - take input from the keyboard
When a program encounters an
statement, it pauses and first
(if included), then a question mark to indicate that
it is waiting for data which may be entered from the keyboard.
The data that is entered is assigned to the variable(s) given in the
variable list and must agree with the type specified by the variable
Prompt is a string constant specifying a prompt string to
be output to the terminal.
Var is the name of the variable (numeric or string) or array
element which will receive the input.
When more than one data item is to be entered in response to an
request, the individual data items must be separated by commas
and the number of items entered must match the number of variables
specified in the statement.
When strings are entered in response to an
statement, they need not be surrounded by quotation marks unless
they contain commas, colons or significant leading or trailing blanks.
If the optional semicolon follows
no newline is output after data is entered, leaving the
cursor on the same line as the response.
Using a comma instead of a semicolon after the prompt string will
suppress the question mark.
10 rem Insert statements for data entry here
input "Is this data correct"; a$
answer$ = left$(a$, 1)
if answer$ <> "y" and answer$ <> "Y" then_
print "Re-enter data" : goto 10
rem Insert statements for data processing here
Is this data correct?
The question mark (displayed by the computer) is a prompt requesting
the user to make an entry.
In this example if the first letter is either "y" or "Y",
the program will go on to process the data just entered.
Otherwise, the program
prints "Re-enter data" and returns to the data entry statements at line 10.
input$, input #, inkey$
In Microsoft BASIC, input is used for input from the userís keyboard
(terminal) and input # is used for input from disk files. In the
UNIX environment, the distinction between terminals and disk files is not
as strong: standard input may be redirected to a disk file or a terminal
may be open as a file. To accommodate this flexibility, the distinction
between input and input # must be merely syntactic rather
than functional. Thus,
input #FileNum, [;] [Prompt;] Var[, Var]...
input #FileNum, [;] [Prompt,] Var[, Var]...
is the synopsis of the input # statement for terminal input (as
described above) when FileNum refers to a file that is a terminal.
Although the organization of these manual pages implies the older,
less flexible system, this organization is maintained only for
convenience, input and input # do not differ functionally.
The difference in behavior between terminal input and disk file input
depends entirely upon the type of file in use.
If the environment variable BASECHO is set to a non-null value
when a Basmark QuickBASIC program begins executing,
the BASIC input/output facility operates differently in order
to support half-duplex terminals such as the IBM 3278.
In this modified behavior of the input/output facility, the terminal
modes are not altered, so that the usual erase and kill processing
and echoing of terminal input are performed.
In the specific case of
appearance of the semicolon following
will not cause suppression of the echo of the newline;
the semicolon is simply ignored.
If the number of data items does not match the number of variables
statement, the message "?Redo from start" will be printed on the
attempts to read the data again.
An "Overflow" error occurs if the value of a data item exceeds
the precision of the associated variable.
The Basmark QuickBASIC Programmerís Manual