for ( i = 0; i < 10; i ++ ) { ... }
        //standart header

	for ( i = 0, x = 1.; i < 10; i += 2, x *= 0.1 ){ ... }   
        //in this case, we use two variables that will change after the execution of the loop body - these are the variables i and x
         // variable i changes in increments of 2:  i + = 2 - abbreviated notation from i = i + 2
         // variable x with each step increases by 0.1 times x = x * 0.1 - abbreviated x * = 0.1