/* * 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; }

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