Trick and Tips

#include<iostream.h>
#include<conio.h>

void main()
{
clrscr();
int n,i;
long sum=0;

cout<<"1^2+3^2+5^2+......+n^2

 Enter Value of n:";
cin>>n;

for(i=1;i<=n;i+=2)
sum+=(i*i);

cout<<"
Sum of given series is "<<sum;
getch();
}