Iterative loop. Code that follows the line containing a For…To command, until the matching Next command, is executed once with variable set to each value from expression1 to expression2 in increments of expression3.
Syntax
For variable = expression1 To expression2 [By expression3]
where
| expression1 | Defines beginning of the loop. |
| expression2 | Defines end of the loop. |
| expression3 | Defines the increment. Optional; if expression3 is not specified, the default value is 1. |
Remarks
If expression1 is greater than expression2 and expression3 is not negative, the intervening code is not executed. When the loop begins, expression2 and expression3 are evaluated once, so changing the variables used in them inside the loop has no effect on the loop.
For compatibility with BASIC, Step may be used in place of By.
Example
DECLARE Test_Value
'This example will print 2, 3, 4, 5, 6, 7, 8, 9, 10.
FOR Test_Value = 2 TO 10
PRINT "Test value = ",Test_Value
NEXT Test_Value
'This example will print 2, 4, 6, 8, 10.
FOR Test_Value = 2 TO 10 BY 2
PRINT "Test value = ",Test_Value
NEXT Test_Value
'This example will print 5, 4, 3, 2, 1.
FOR Test_Value = 5 TO 1 BY -1
PRINT "Test value = ",Test_Value
NEXT Test_Value