程序代码：

#include<stdio.h>
#include<math.h>
double Y(double x, int n);
int main()
{
    int n=0;
    double x=0;
    float y=0;
    printf("Please input x and n:");
    scanf("%lf,%d",&x,&n);
    y=Y(x,n);
    printf("Result=%.2f\n",y);
    return 0;

 }

 double Y(double x,int n)

 {
   float sum;
   if(n>=1)
   {
   sum=sqrt(Y(sqrt(x),n-1));
   return sum;
   }
   if(n<1)
   return 0;

 }