java - 函数 powRec(x,n-1) 如何执行求幂？

Question

class PowerRec
{
   static double powRec(double x, int power)
   {
      if (power == 1){
        return x;        
      }      
      return x * powRec(x, power - 1);
   }

  public static void main(String args[])
  {
    double x = 2;
    System.out.println (x + " to the fourth is " + powRec (x, 4));
  }    
}

Answer 1

您的代码中连续有两个返回语句。并且 powRec 方法错误

 static double powRec(double x, int power) {
    if (power == 0) {

        return 1;


    }
    return x * powRec(x, power - 1);
}