摘要：
1 #include <stdio.h> 2 #include <math.h> 3 4 void main() 5 { 6 int a[21]; 7 int n,i; 8 double p,sum; 9 a[0] = 0; a[1] = 1;10 for(i = 2; i <= 20; i ++)11 a[i] = a[i-1] + a[i-2];12 while(scanf("%d",&n)!= EOF)13 {14 if(n <= 20)15 {16 pri... 阅读全文
