Project Euler, Problem #6, C

/* Find the difference between the sum of the squares of the first one
hundred natural numbers and the square of the sum. */

/* Solution #1 */

#include <stdio.h>

int main()
{
     int i;
     int natNumSum = 0, squareNumSum = 0;

     for(i = 1; i < 101; i++)
          natNumSum += i;

     for(i = 1; i < 101; i++)
          squareNumSum += i * i;

     printf("%d\n", natNumSum * natNumSum - squareNumSum);
     return(0);
}

/* 25164150 */


/* Solution #2 */

#include <stdio.h>
#include <math.h>

int main()
{
     int i;
     double natNumSum = 0;
     double squareNumSum = 0;

     for(i = 1; i < 101; i++)
          natNumSum += i;

     for(i = 1; i < 101; i++)
          squareNumSum += pow(i, 2);

     printf("%.0f\n", pow(natNumSum, 2) - squareNumSum);
     return(0);
}

/* 25164150 */