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   for

     for(exp1; exp2; exp3)
         statement;

     . exp1 is executed ONCE only before the loop starts.

     . exp2 is evaluated each time around the loop and the loop
       only continues if it is true.

     . exp3 is executed after the statement each time around the loop.

     You could write the above like this:

     exp1;
     while(exp2)
     {
        statement;
        exp3;
     }