1 FOR
 The  FOR  statement  repeatedly  executes  a  block  of  statements  while
 incrementing  a  specified  control  variable  for  each  execution of the
 statement block.  FOR loops can be conditional or  unconditional  and  can
 modify other statements.

 Examples

 FOR I% = 1% TO 10% STEP 2%
      .
      .
      .
 NEXT I%
 FOR N% = 5% STEP 4% WHILE 400 - Z < .0001
      .
      .
      .
 NEXT N%
      .
      .
      .
 PRINT I% ** I% FOR I% = 1% TO 3%

2 Syntax

 Unconditional:

     FOR num-unsubs-var = num-exp1 TO num-exp2 [ STEP num-exp3 ]

         [ statement ]...

     NEXT num-unsubs-var

 Conditional:

                                                   {UNTIL}
     FOR num-unsubs-var = num-exp1 [STEP num-exp3] {WHILE} cond-exp

         [ statement ]...

     NEXT num-unsubs-var

 Unconditional Statement Modifier:

     statement FOR num-unsubs-var = num-exp1 TO num-exp2 [STEP num-exp3]

 Conditional Statement Modifier:

     statement FOR num-unsubs-var = num-exp1 [step num-
            exp3] {WHILE} cond-exp