Is this a valid way to declare a for-loop ?

for( int i = 0; i

Question

Is this a  valid  way to declare a  for-loop ? 
 
 for( int i = 0; i < 20; i *= 2 ){ 
     //Statements 
 }

Answer

No, if the update is of more than one it must be written as i = i * 2

Answer

Yes.

Answer

No, because the update can only use addition/subtraction. Other operators, like multiplication and division aren't allowed.

Answer

No, the update can only be in increments of one (++ or --)

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