2009

今天的10题结束

求数列的和 

#include <stdio.h>
#include <math.h>

int main()
{
    int m,i;
    double n,sum;
    while(scanf("%lf %d",&n,&m))
    {
        sum = 0;
        for(i =0;i< m;i++)
        {
            sum += n;
            n = sqrt(n);
        }
        printf("%.2lf
",sum);
    }
    return 0;
}

参考c++

#include <math.h>
#include <stdio.h>

int main(void)
{
    int n;
    double x, s;

    while (scanf("%lf%d", &x, &n) != EOF)
    {
        for(s = 0.0; n--; x = sqrt(x))
            s += x;
        printf("%.2lf
", s);
    }

    return 0;
}