9
votes
Accepted
what is the difference beween atoi and (int)
Type casting using (int) would work predictably on a single char, although it would probably not give you the result you are expecting anyway. It does not give anything meaningful on a string.
A ...
- 1,112
3
votes
Accepted
pset3 duration itoa - with "&"
First, understand what strings in C are.
Strings in C are pointers to a character, or char* (if you use type string, that's a custom alias for the same thing). The convention then says that the ...
- 20.7k
2
votes
atoi always returns 0
If this is for example for Caesar cipher and you're running ./caesar 2 then key should indeed be set to an integer of 2 as argv[0] is the program name and argv[1] is the string 2.
But int atoi(...
- 264
1
vote
CS50-pset2-Validating the Key-how to check or reject the user's input is decimal or not
You are meant to reject any number of command-line arguments other than one (means argc should be 2).
To test whether a given character is numeric/alphabetic, you can use the isdigit/isalpha function (...
- 20.7k
1
vote
Accepted
How to validate the key in caesar?
Is this due to where I am putting my atoi code?
actually it's because you didn't read atoi's manual page. carefully, at least. the man page explicitly states that
atoi does not detect errors
which ...
- 17.4k
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