#include #include /* * File: practice.c * Purpose: sum of positive integers practice problem * Author: pc2@ecs.csus.edu * * Returns 4 if there is an error, 0 on successful solution. * * $Id: practice.c 543 2007-05-03 18:32:47Z laned $ */ #define INFILE "practice.in" int main (int argc, char **argv) { int sum = 0; int i = 0; FILE *fp = fopen (INFILE, "rt"); char line[128]; if (fp != NULL) { while ( fgets (line, sizeof(line), fp) != NULL) { long inval = atol (line); sum = 0; if (inval == 0) exit (0); if (inval < 1) { for (i = 1; i >= inval; i --) sum += i; } else { for (i = 1; i <= inval; i ++) sum += i; } printf("N = %-3d Sum = %d\n", inval, sum); } printf("Did not find trailing zero \n"); } else { fprintf(stderr,"Could not read file %s \n", INFILE); } exit (4); } /* eof practice.c */