HP Business BASIC/XL Reference Manual - HP 3000 MPE/iX Computer Systems - Edition 1 (32715-90001)

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FOR Clause in Display List
The display list of a DISP statement 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 ], output_item_list )
Parameters
num_var A numeric variable assigned the sequence of
values: num_expr1 , num_expr1 +num_expr3,
num_expr1 +(2* num_expr3 ), etc. The DISP or PRINT
statement prints the values of the elements of d_list
for each value 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 DISP or
PRINT statement prints a value. If num_var >
num_expr2 , the loop is not executed.
num_expr3 Amount that num_var increases by if num_expr2 is
positive or decreases if num_expr2 is negative at end
of the loop. The default value is 1 if the step
option is not specified.
output_item_ list Same as d_list in DISP or PRINT statement syntax.
Examples
The following example shows the use of a FOR clause in the display list.
20 DISP "Values for A are: ",(FOR I=1 TO 4, A(I);),,,"X Value: ",X
If each variable is assigned the following values prior to execution of
line 20:
A(1) = 10
A(2) = 20
A(3) = 30
A(4) = 40
X = 50
The output generated by line 20 is:
Values for A are: 10 20 30 40
X Value: 50
Display list FOR clauses can be nested.
20 DISP (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 variable value that the above statement prints.
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| Value of I | Value of J | Value of K | Variable Printed |
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| 1 | 1 | 1 | B(1,1,1) |
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| 1 | 1 | 2 | B(1,1,2) |
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| 1 | 2 | 1 | B(1,2,1) |
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