ＨＤＵ ２００９求数列的和

水题

#include<stdio.h>
#include<math.h>
int main( )
{
    double n,sum;
    int m;
    while( scanf( "%lf%d",&n,&m ) != EOF )
    {
           sum = 0;
           for( int i = 0; i < m; ++i )
           {
                sum += n;
                n = sqrt( n );
            }
           printf( "%.2lf\n",sum );
           }
    return 0;
}