This is Problem 1 of Project Euler written in C. Stay tuned to my bitbucket to get more problems to this project written in C and Objective-C. I built this project on my FreeBSD box with clang 3.6.
void Problem1()
{
int sum = 0;
int i = 0;
while (i < 1000)
{
if (i%3 == 0 || i%5 == 0)
{
sum += i;
}
i++;
}
printf("Sum of all natural numbers below one thousand that are \
multiples of 3 or 5 is: %d\n", sum);
}