数值的整数次方

bool g_InvalidInput=false;
  double Power(double base, int exponent){
       g_InvalidInput=false;
      if(equal(base,0.0)&& exponent<0){
       g_InvalidInput=true;
        return 0.0;
    }
      unsigined  int absExponent=(unsigned int)(exponent);
        if(exponent<0)
            absExponent=(unsigned int)(-exponent);
        double result=PowerWithUnsignedExponent(base,absExponent);
        if(exponent<0)
            result=1.0/result;
        return result;
  }
  double PowerWithUnsignedExponent(double base,unsigned int exponent){
     double result=1.0;
     for(int i=1;i<exponent;++i){
     result=*base;
     }
     return result;
  }
  bool equal(double num1,double num2){
   if((num1-num2>-0.0000001)&&(num1-num2<0.0000001))
       return true;
   else
       return false;
  }