1018: C语言程序设计教程（第三版）课后习题6.8

 1 #include "stdio.h"
 2 
 3 int main(int argc, char const *argv[])
 4 {
 5 
 6     int N, m = 2, n = 1, i;
 7     float s = 0;
 8     scanf("%d", &N);
 9     for(i = 0; i < N; i++)
10     {
11         int t;
12         s += (float)m / n;
13         t = m;
14         m = n + m;
15         n = t;
16     }
17 
18     printf("%.2f\n", s);
19     return 0;
20 }