#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
double a=1,b=2,c,sum=0;
int n;
cin>>n;
for(int i=0;i<n;i++)
{
sum+=b/a;
c=b;
b+=a;
a=c;
}
cout<<fixed<<setprecision(2)<<sum<<endl;
return 0;
}
不說廢話了......
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
double a=1,b=2,c,sum=0;
int n;
cin>>n;
for(int i=0;i<n;i++)
{
sum+=b/a;
c=b;
b+=a;
a=c;
}
cout<<fixed<<setprecision(2)<<sum<<endl;
return 0;
}
不說廢話了......
https://github.com/Molunerfinn/PicGo https://github.com/Molunerfinn/PicGo