Differance between sum square and square sum

question:

The sum of the squares of the first ten natural numbers is,
1^(2) + 2^(2) + ... + 10^(2) = 385
The square of the sum of the first ten natural numbers is,
(1 + 2 + ... + 10)^(2) = 55^(2) = 3025
Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 − 385 = 2640.
Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
answer:
#include
#include
void main()
{
 long int i,sum=0,sq=0;
 clrscr();
 for(i=0;i<=100;i++)
 {
  sum=sum+i;
  sq=sq+(i*i);
 }
 printf("sum sq=%ld,sq=%ld,diff=%ld",sum*sum,sq,(sum*sum)-sq);
 printf("over");
 getch();
}

output:25164150

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