19. 求平方根序列前N项和

求平方根序列前N项和

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

int main()
{
    int i, n;
    double item, sum;
    while (scanf("%d", &n) != EOF)
    {
        sum = 0;
        for (i = 1; i <= n; i++)
        {
            item = sqrt(i);
            sum = sum+item;
        }
        printf("sum = %.2f\n", sum);
    }
    return 0;
}