Program of sum of squares of n numbers

#include<iostream>

using namespace std;

int main()

{

long int sum=0;

int n,i;

cout<<"\n enter the number: ";

cin>>n;

for(i=1;i<=n;i++)

{

sum=sum+i*i;

}

cout<<"\n sum of squares of first "<<n<<" numbers is "<<sum;

}