c语言代码解决问题

解题思路:

注意事项:

参考代码:

#include<stdio.h>

int main()

{

    int n, i;

    float p = 1, q = 2,sum=2.0,temp;

    scanf("%d", &n);

    for (i = 1; i <= n-1; i++)

    {

        temp = p;

        p = q;

        q = q + temp;

        sum += q / p;

    }

    printf("%.4f", sum);

    return 0;

}