sum of the series 1^2+2^2+3^2+----+n^2

#include<stdio.h>
main()
{
int i,n,sum=0;
printf("Enter the max. value of series:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
sum=sum+(i*i);
}
printf("Sum of the series=%d",sum);
}