[C] 제곱근 구하기

#include<stdio.h>

 

double square_root(double num)

{

      double next;

      double temp;

   

      next = 0.5*(1+(num/1));

 

      while(1)

       {

 

          temp=next;

          next = 0.5*(next+(num/next));

 

          if(temp-next<0.005 || temp-next<-0.005)

                    break;

 

         }

 

         return next;

}

 

int main(void)

{

   printf("%lf", square_root(4));

 

   getchar();

   return 0;

}