sum to n terms

//prg to sum 1+1/3+1/5+1/7......nterms
#include<iostream.h>
#include<conio.h>
void main()
{
int n,j;
float sum=0,i;
cout<<"enter the value of n"<<endl;
cin>>n;
for(i=0;i<=(n-1);i++)
{sum=sum+1/(2*i+1);
 }
 cout<<sum;
 }