[刷题] PTA 7-34 求分数序列前N项和

程序：

 1 #include<stdio.h>
 2 
 3 int main() {
 4     int i,n;
 5     double fz = 1,fm = 0,sum = 2;
 6     scanf("%d",&n);
 7     double s = 0;
 8     for(i = 1; i <= n; i++) {
 9         fm = fz;
10         fz = sum;
11         sum = fz + fm;
12         s += fz/fm;
13     }
14     printf("%0.2lf",s);
15 }

 

posted @ 2019-04-16 21:48  cxc1357  阅读(617)  评论(0)  编辑  收藏  举报