help needed

hi people

have problem , dont know how solve it.

my code this...

code: [select]

   {

     if  (average > 0)

     {
       dir = high;
     }
     else if (average < 0)
     {

       dir = low;  
     }

     int i;

     digitalwrite(dirpin, dir);     // set direction.
     delay(100);


     for (i = 0; i<average; i++)       // iterate 4000 microsteps.
     {
       digitalwrite(steppin, low);  // low high change creates the
       digitalwrite(steppin, high); // "rising edge" easydriver knows when step.
       delaymicroseconds(200);      // delay time close top speed this
     }  


but goes in 1 direction.
this because of line...

code: [select]

for (i = 0; i<average; i++)

it not work if (average) -#

how make (average) +# ??

thanks  

abs
http://arduino.cc/en/reference/abs

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