View Code of Problem 48

#include <iostream>
using namespace std;

int main(){
  int n;
  double sum,t;
  while(scanf("%d",&n)!=EOF){
    int fenzi = 2;
    int fenmu = 1;
    sum =0;
    for(int j=0;j<n;j++){
      sum+=fenzi/fenmu;
      t = fenzi;
      fenzi = fenzi + fenmu;
      fenmu = t;
      
    }
    printf("%.6lf\n",sum);
  }
}

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