/*
* methods/iterate.c
*
* Calculate the sum of a given range of integer numbers.
*
* This particular method of implementation works by way of brute force,
* i.e. it iterates over the entire range while adding the numbers to finally
* get the total sum. As a positive side effect, we're able to easily detect
* overflows, i.e. situations in which the sum would exceed the capacity
* of an integer variable.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "iterate.h"
int iterate_get_sum (int min, int max)
{
int i, total;
total = 0;
/* This is where we loop over each number in the range, including
both the minimum and the maximum number. */
for (i = min; i <= max; i++)
{
/* We can detect an overflow by checking whether the new
sum would become negative. */
if (total + i < total)
{
printf ("Error: sum too large!\n");
exit (1);
}
/* Everything seems to fit into an int, so continue adding. */
total += i;
}
return total;
}