C++ Program To Find Sum Of The Given Series 1/2+4/5+7/8+ . . . N

#include<iostream>
using namespace std;
int main()
{
 int i,n;
 float sum=0,x,a=1;

 cout<<"\n1/2+4/5+7/8+……'\n";
 cout<<"\nEnter The Number of Terms \n";
 cin>>n;

 for(i=0;i<n;++i)
 {
  x=a/(a+1);
  sum+=x;
  a+=3;
 }

 cout<<"\n Sum = "<<sum<<endl;
 return 0;
}

Output:

1/2+4/5+7/8+……'

Enter The Number of Terms 

3

 Sum = 2.175