HP 3000 Manuals HP 3000 Manuals
INPUT
The INPUT statement assigns data values obtained from the terminal or a
file to one or more variables.
Syntax
[ [{,} ] ]
INPUT[:] [input item [{;} input_item]...] [:]
Parameters
: A colon specifies that either data currently in the
input buffer should be assigned prior to prompting for
input or extra input is saved in the input buffer.
* If a colon precedes the input_items, the INPUT
statement assigns values in the input buffer to
input_elements, from left to right, before prompting
you for input or reading input from a file. If this
colon is not specified, HP Business BASIC/XL empties
the input buffer before accepting input values.
* If a colon follows the input_items, the INPUT
statement stores unassigned input values that are
not required to satisfy assignments to the
input_items in the input buffer.
{[prompt_option] input_element}
input_item {for_clause }
An INPUT statement without input_items puts the program
in the input state until you press RETURN, but the
values entered are not assigned to any input_elements.
{PROMPT str_expr}[,]
prompt_option {str_lit }[;]
If the prompt is not followed by a separator or a comma,
a carriage return is generated and user input begins on
the next line. Semicolons suppress the carriage return
and input can be typed on the same line as the prompt.
See "INPUT Prompt" in chapter 6 for more information.
input_element One of the following variables that a value is assigned
to:
num_var
str_var
array_name([*[,*]...])
The last format above has either zero or one asterisk
per dimension. The absence of asterisks specifies any
number of dimensions. Either format is legal, but the
format without asterisks is noncompilable.
for_clause (FOR num_var=num_expr1 TO num_expr2 [STEP num_expr3],
input_item [, input_item]...)
A for_clause is useful for reading array elements (an
array can also be input with the MAT INPUT statement).
See "FOR Clause in Input List" for more information.
Examples
The following examples show several ways to use the INPUT statement.
INPUT
INPUT A,B$,C(*)
INPUT A,B$,C(*):
INPUT:
INPUT: A,B$,C(*)
INPUT: A,B$,C(*):
INPUT A$ A,B$,C(*)
INPUT PROMPT D$; X,Y, PROMPT D1$+D2$, Z
INPUT "Input 2 numbers",X,Y,PROMPT D1$+"A";Z,"Input name",N$:
INPUT: (FOR I=1 TO 10, W(I), WW(I,I))
INPUT "Input A and elements of V"; A, (FOR J=1 TO 5, V[J]):
An INPUT statement that begins with a colon assigns the values in the
input buffer before prompting you for input or reading it from a file.
An INPUT statement that ends in a colon stores unassigned input values in
an input buffer.
An INPUT statement that does not begin or end with a colon empties the
input buffer before prompting for input.
FOR Clause in Input List
An input list can contain a FOR clause. The FOR clause is similar to the
FOR NEXT construct.
Syntax
(FOR num_var=num_expr1 TO num_expr2 [STEP num_expr3], input_item
[,input_item]...)
Parameters
num_var Assigned the sequence of values: num_expr1,
num_expr1+num_expr3, num_expr1+(2*num_expr3), etc. The
INPUT statement reads one input value for each value of
num_var that is less than num_expr2 (if num_expr3 is
positive) or greater than num_expr2 (if num_expr3 is
negative).
num_expr1 First value assigned to num_var.
num_expr2 Value that num_var is compared to before the INPUT
statement reads a value. If num_expr3 is positive and
num_var > num_expr2, loop execution is terminated. If
num_expr3 is negative and num_var < num_expr2, the loop
execution is terminated.
num_expr3 Amount that num_var increases by at the end of the loop.
The default = 1.
input_item Same as input_item in INPUT statement syntax.
Examples
10 INPUT "Input 4 numbers: ", (FOR I=1 TO 4, A(I)), "Input X: ", X
If you input the underlined values during execution:
Input 4 numbers:
10, 20, 30, 40
Input X:
50
Following execution of line 10, the values assigned to each variable will
be:
A(1) = 10
A(2) = 20
A(3) = 30
A(4) = 40
X = 50
Input list FOR clauses can be nested.
20 INPUT (FOR I=1 TO 3, (FOR J=1 TO 2 (FOR K=1 TO 2, B(I,J,K))))
For each combination of values of I, J, and K, the following table shows
the value that the above INPUT state assigns to each variable.
--------------------------------------------------------------------------------------------------
| | | | |
| Value of I | Value of J | Value of K | Variable Read |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 1 | 1 | 1 | B(1,1,1) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 1 | 1 | 2 | B(1,1,2) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 1 | 2 | 1 | B(1,2,1) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 1 | 2 | 2 | B(1,2,2) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 2 | 1 | 1 | B(2,1,1) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 2 | 1 | 2 | B(2,1,2) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 2 | 2 | 1 | B(2,2,1) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 2 | 2 | 2 | B(2,2,2) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 3 | 1 | 1 | B(3,1,1) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 3 | 1 | 2 | B(3,1,2) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 3 | 2 | 1 | B(3,2,1) |
| | | | |
--------------------------------------------------------------------------------------------------
| | | | |
| 3 | 2 | 2 | B(3,2,2) |
| | | | |
--------------------------------------------------------------------------------------------------