View Code of Problem 48

#include <iostream>
using namespace std;

int main(){
    int n;
    double sum,t,fenzi,fenmu;
    while(scanf("%d",&n)!=EOF){
        fenzi = 2;
        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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