For
 Usage
• For[start, test, incr, body] executes start, then repeatedly evaluates body and incr until test fails to give True.
Notes
• For evaluates its arguments in a non-standard way. • For[start, test, incr] does the loop with a null body. • The sequence of evaluation is test, body, incr. The For exits as soon as test fails. • If Break[ ] is generated in the evaluation of body, the For loop exits. • Continue[ ] exits the evaluation of body, and continues the loop by evaluating incr. • Unless Return[expr] or Throw[expr] is generated, the final value returned by For is Null. • Example: For[tot=0; i=0, i < 3, i++, tot += f[i]]. Note that the roles of semicolon and comma are reversed relative to the C programming language. • New in Version 1.
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