Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I’m trying to do some stuff with characterAtIndex and I’m stumped. if ([myString characterAtIndex:0]==0) works fine, if I’m looking for the number zero–but if I’m looking for a decimal point, if ([myString characterAtIndex:0]==.) just gives me an error. Is there another way to do this?
Check again.
[myString characterAtIndex:0] == 0will compile, but it won’t do what you expect. That condition tests if the first character of your string is the character with the ASCII value of 0, which isn’t the numeral 0: it’s the NUL character.-characterAtIndex:returns a value that you can compare with a character literal, which is a character enclosed in single quotes:'0'or'.', for example.