Using ctime

Well gprof is saying the factorial is quite fast, execution time is 0, so, I'll roll out my own time keeper,

Now, the main function is modified as,

int main(void)
{
        int number,result;
        time_t startTime,endTime;

        printf("\nEnter number: ");
        scanf("%d",&number);

        time(&startTime);

        result = factorial(number);
        time(&endTime);

        printf("\nStart Time: %d\nEnd Time: %d\n%d! = %d",startTime,endTime,number,result);
        printf("\nTime for calculation: %d",difftime(endTime,startTime));

        return 0;
}

Executing I get,

Enter number: 19

Start Time: 1320051528
End Time: 1320051528
12! = 479001600
Time for calculation: 0

Bad, bad factorial is too simple... A better challenge is needed....