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Message: [QUOTE="pereges, post: 3580972"] btw i want to read a string containing 3 numbers: "1234 3333 6666" SO the logic I used was unsigned long l1, l2, l3; char s[] = "1234 3333 6666" char *endptr1, *endptr2 errno = 0; l1 = strtoul(s, &endptr1, 10); l2 = strtoul(&endptr1, &endptr2, 10); l3 = strtoul(&endptr2, NULL, ), 10); if (errno == ERANGE) { if (l1 == ULONG_MAX || l2 == ULONG_MAX || l3 == ULONG_MAX) { /* do the error handling */ } } else { if (s == endptr1 || endptr1 == endptr2) { printf("Conversion failed"); return (1); } } [/QUOTE]