View Code of Problem 48

#include<stdio.h>
int main(){

    int n ;
    scanf("%d",&n);
    int i,c;
    double s=0,a=2,b=1;
    for(i=0;i<n;i++){
        s+=a/b;
        c=a;
        a=a+b;
        b=c;
    }

    printf("%.6lf",s);
    return 0;
}