#include <stdio.h> #include <stdlib.h> #include <math.h> #include <string.h> int main() { int i,n; double sum,a[100]; double t1=1.0,t2=2.0,temp; sum=a[0]=0.0; for (i=1;i<100;i++) { sum=sum+t2/t1; a[i] = sum; temp=t2; t2=t1+t2; t1=temp; } while (scanf("%d",&n)!=EOF) { printf("%.6lf\n",a[n]); } return 0; } |
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