10-20-2009
Not very strange. Your second example relates to a controlling expression which is always evaluated before each execution of the for loop. See ISO C99 6.8.5.3.
The statement for ( clause-1 ; expression-2 ; expression-3 ) statement
behaves as follows: The expression expression-2 is the controlling expression that is
evaluated before each execution of the loop body. The expression expression-3 is
evaluated as a void expression after each execution of the loop body. If clause-1 is a
declaration, the scope of any variables it declares is the remainder of the declaration and
the entire loop, including the other two expressions; it is reached in the order of execution
before the first evaluation of the controlling expression. If clause-1 is an expression, it is
evaluated as a void expression before the first evaluation of the controlling expression.
Both clause-1 and expression-3 can be omitted. An omitted expression-2 is replaced by a
nonzero constant.
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