C++语言问题

#include<iostream>
using namespace std;
void main(){
int n,sum=0,i=0;
cin>>n;
while(i<n){
i++;
if((i%2)!=0)
sum+=i;
}
cout<<"奇数和为"<<sum;
}

---

#include<iostream>
using namespace std;
void main(){
int n,sum=0,i=0;
cin>>n;
while(i<n){
i++;
if((i%2)!=0)
sum+=i;
}
cout<<"奇数和为"<<sum;
}