On 26 Mar 2009, at 00:55, Trevor Daniels wrote:
The manual says that \char #65 produces the letter "A". Here, 65 is
an ordinary integer. Which position number basis? The ASCII
hexadecimal number for "A" is 41, in languages like C/C++ written
as 0x41, and in Unicode U+0041. What is the decimal number? In
decimal, 4*16+1 = 65. What is the representation in the computer?
All ASCII characters are translated as binary numbers. Since the
hexadecimal form is 41, 0x4 is binary 0100, and 0x1 is binary 0001,
0x41 is binary 01000001. So 0x41 is one 8-bit byte.
So the manual is a bit short: it should say that the number is a
decimal integer representing the Unicode code point.
No, the argument to \char is a hex number.
No, the argument is an integer: Robin Bannister pointed out that
Guile, which LilyPond calls, has syntax for different number basis:
http://www.gnu.org/software/guile/manual/html_node/Number-Syntax.html
So when you have used it, you probably have written
\char #x41
Right?
Hans
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