1 /* 2 * methods/iterate.c 3 * 4 * Calculate the sum of a given range of integer numbers. 5 * 6 * This particular method of implementation works by way of brute force, 7 * i.e. it iterates over the entire range while adding the numbers to finally 8 * get the total sum. As a positive side effect, we're able to easily detect 9 * overflows, i.e. situations in which the sum would exceed the capacity 10 * of an integer variable. 11 * 12 */ 13 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include "iterate.h" 17 18 19 int iterate_get_sum (int min, int max) 20 { 21 int i, total; 22 23 total = 0; 24 25 /* This is where we loop over each number in the range, including 26 both the minimum and the maximum number. */ 27 28 for (i = min; i <= max; i++) 29 { 30 /* We can detect an overflow by checking whether the new 31 sum would become negative. */ 32 33 if (total + i < total) 34 { 35 printf ("Error: sum too large!\n"); 36 exit (1); 37 } 38 39 /* Everything seems to fit into an int, so continue adding. */ 40 41 total += i; 42 } 43 44 return total; 45 } 46
