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Diffstat (limited to '')
| -rw-r--r-- | luhncheck.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/luhncheck.c b/luhncheck.c index 51f04ab..65315e4 100644 --- a/luhncheck.c +++ b/luhncheck.c @@ -9,6 +9,9 @@ NUSAGE(2, "number ..."); +#if defined(__GNUC__) +__attribute__((__pure__)) +#endif static int check_luhn(const char *s) { @@ -27,6 +30,8 @@ check_luhn(const char *s) break; s++; + /* fall through */ + case 1: if ('0' <= *s && *s <= '9') sum += (unsigned)(*s - '0'); |