#include<cstdio> #include<cstdlib> #include<cmath> #include<cstring> #include<iostream> using namespace std; int main(){ float a=2.0,b=1.0; float sum=2.0; int n; scanf("%d",&n); for(int i=1;i<n;i++){ int t=a; int m=b; a=a+b; b=t; sum+=a/b; } printf("%.6f\n",sum); return 0; } |
Double click to view unformatted code.