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Thread: Increment operators on char

  1. #1
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    Default Increment operators on char

    i am trying to understand increment operators on char:

    public class Ch8 {
    	public static void main(String[] args) {
                 char c = 'a';
                 c = c+1;  

    why does c++ lead to c = 'b' ? i understand why c =c +1 is a error but how come c++ gets away with that error??

  2. #2
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    Default Re: Increment operators on char

    c = c + 1; isn't necessarily in error per se. It's just when you add a char to an int, you get an int, so for this to work you must cast the result as a char:

    c = (char) (c + 1); // this works

    c++ does this automatically for you.

  3. #3
    Super Moderator pbrockway2's Avatar
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    Default Re: Increment operators on char

    i understand why c =c +1
    Why is it an error? I'm asking because it might shed light on why "c++;" is valid.

    Exactly what happens when you say "c++;" involves all sorts of fussy details. They are described in the Java Language Specification 15.14.2. Postfix Increment Operator ++. Pay attention to what is says about the primitive narrowing conversion. You might want to compare that with what happens with simple assignment (5.2).

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