it is about pset 2 caesar.c
Question 1: Do I need to consider the case when the user input something after ./caesar (argv ) instead of an integer?
Example: ./ caesar a
Question 2: I found out the following hints from the cs50 website:
$ ./caesar Usage: ./caesar k $ ./caesar 1 2 3 4 5 Usage: ./caesar k
Is that mean I have to printf("Usage: ./caesar k\n") and to return 0; when argc equal to 2?