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FOR...TO...NEXT
Chapter 2 Program Instructions
Field of Application Statement for creating a loop in the program execution, where a counter
is incremented or decremented until a specified value is reached.
Syntax FOR=TO[STEP]NEXT[]
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is the variable to be used as a counter.
1
2
3
is the initial value of the counter.
is the final value of the counter.
is the value of the increment (decrement).
Remarks This statement is always used in connection with a NEXT statement.
The counter () is given an initial value by the numeric expression
(). If no increment value is given (STEP ), the value 1 is
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assumed. A negative increment value will produce a decremental loop. Each
time the statement NEXT is encountered, the loop will be executed again until
the final value, specified by (), is reached. Then the execution will
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proceed from the first line after the NEXT statement.
If the optional variable is omitted in the NEXT statement, the program
execution will loop back to the most recently encountered FOR statement. If
the NEXT statement does include a variable, the execution will loop back to
the FOR statement specified by the same variable.
FOR...NEXT loops can be nested, i.e. a loop can contain another loop etc.
However, each loop must have a unique counter designation and the inside
loop must be concluded by a NEXT statement before the outside loop can be
executed.
Example The counter A% is incremented from 20 to 100 in steps of 20 by means of a
FOR...NEXT loop:
10 FOR A%=20 TO 100 STEP 20
20 PRINT A%
30
RUN
NEXT
20
40
60
80
100
yields
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