On Wednesday, 14 August 2013 at 02:53:43 UTC, jicman wrote:
Greetings.
import std.stdio;
void main()
{
char[] str = "不良反應事件和產品客訴報告"; // 13 chinese characters...
writefln(str.length);
}
this program returns 39. I expected to return 13. How do I
know the exact length of the characters that I have in a char[]
variable? Thanks.
josé
What version of DMD are you using? This code doesn't even compile
for me. It gives me errors about not being able to convert type
string to char[], like it should since a string literal is
immutable data. To test the code I changed char[] to string. I
also got an error for "writefln(str.length);" so I just changed
that to "writeln(str.length);"
Anyways, from what I understand, the reason you get this is
because each of those characters is greater than a single 8 byte
representation. D's chars are utf-8, so that means it takes more
than a single char to store the data needed to represent one of
the chinese characters. str.length will give you the length of
the string with respect to each char it contains. You have 13
characters in your string, but you need 39 chars to store the
data to represent them.
Alternatively, you can use a different encoding to see the
actual number of characters in your string, eg. wstring or
dstring. I usually use dstrings when working with unicode
personally.
