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Diffstat (limited to 'wk2/pset2/caesar/caesar.c')
| -rw-r--r-- | wk2/pset2/caesar/caesar.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/wk2/pset2/caesar/caesar.c b/wk2/pset2/caesar/caesar.c index 3cc273f..7ef472b 100644 --- a/wk2/pset2/caesar/caesar.c +++ b/wk2/pset2/caesar/caesar.c @@ -6,7 +6,12 @@ bool only_digits(string phrase); int main(int argc, string argv[]) { - only_digits(argv[1]); + if (only_digits(argv[1]) == false) { + printf("Usage: ./caesar key\n"); + return 1; + } else { + return 0; + } } bool only_digits(string phrase) { |