求数列和

A(n+1)=sqrt(A(n))

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<math.h>
 4 #include<string.h>
 5 int main()
 6 {
 7     double n,t;
 8     int m;
 9     double sum;
10     while (scanf("%lf",&n)!=EOF)
11     {
12         scanf("%d",&m);
13         sum=0;
14         while(m--)
15         {
16             sum+=n;
17             n=sqrt(n);            
18         }
19         printf("%.2lf\n",sum);
20     }
21     return 0;
22 }