Implement java's pow function

Question

dylan · Accepted Answer

static double pow(double val, double n)
{
   double res = 1;
   for(int i = 0; i < n; i++)
   {
       result *= val;
   }
   return val;
}

Sid · Answer

Fast exponentiation: (I think this runs in order of O(log n), not sure though)

static double fast_pow (double val, double n){
if (n==0) return 1;

int x =  fast_pow (val, n/2);
x = x*x;
if (n%2)
    x = x*val;
return x;
}

Rohit Shukla · Answer

double myPow(double x, int n)
{
  if(n==0)
     return 1;
 else
{
    if(n%2==0)
          return myPow(x*x, n/2);
   else
         return  x*myPow(x*x, n/2);
}

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