51页14题，斐波那契分数序列前n项和。

/* Note:Your choice is C IDE */
#include "stdio.h"
void main()
{
int x,i;
float m,n,M,N;
float y,z;
n = 2;
m = 1;
y = 2;
printf("输入需要运算的项数:");
scanf("%d",&x);
for(i = 1;i < x;i++)
{

M = n;
N = M+m;
m = M;
n = N;
z = (N/M);
y = y+z;

}
printf("输出项数和的值：%f",y);
}