Error for public static double pow -

i new @ java forgive me if ask stupid question. have assignment need calculate pow of 2 numbers (lets it's 2.0^3) supposed use public static double pow() . reason following errors:

for ecpipse it's- error: not find or load main class exp.e

and drjava- static error: no method in static pow has name 'main'

class pow 

{

 public static double pow( double x, long y )   {         x = 2.0;        y = 3;        double exp  = math.pow(x,y);        return exp;  } 

}

i must missing basic. spent significant amount of time on , can't figure out. please point me out doing wrong

you missing main method.

every program in java starts calling public static void main(string[]) method. code doesn't seem have method. need create one, program run. other methods should called main, or method called main, or method called method called main. so-called call stack, because methods "stacked" when called , removed stack when on (hopefully return statement, such in method). when stack uses memory, have "stack overflow" error - which, not coincidence, name of website.

hope helps.