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Message: [QUOTE="Ben Bacarisse, post: 3580973"] Exactly, though i was also talking about the if part as well. You had (corrected to avoid HUGE_VAL) if (errno == ERANGE) { if (l == ULONG_MAX) fprintf(...); } I'll say what I'd do below... And it is correct, but that does not mean that a return of zero means no conversion could be performed (it's and "if" not an "if and only if"). I think you are making this too complex. Only two things can go wrong with strtoul and they are easy to test for. If no conversion has been done, then the end pointer is set to the initial pointer passed. If a range error occurs, errno is set and ULONG_MAX is returned: unsigned long l; char *ep; errno = 0; if ((l = strtoul(num, &ep, 10)) == ULONG_MAX && errno == ERANGE) fprintf(stderr, "Number out of range.\n"); else if (ep == num) fprintf(stderr, "Invalid number (not converted).\n"); [/QUOTE]