c
& amp'
Is a single character enclosed in single quotation marks, correct.
a
\xff '
b
'\65'
d'\028 '
Are some characters enclosed in single quotation marks, but because they are preceded by
There is an escape character.
'\'
You can't say that they don't meet the definition, they are all illegal.
a
\xff '
middle
\x '
The combined representation is a hexadecimal number.
Familial benign hypercalcemia Familial Benign Hypercalcemia
=
10
binary
255
It represents the ascii of invisible characters.
Code,
legal
b
'\65'
In the same way; In a similar way
'\'
+
Three decimal digits
\ddd '
this means
Octal number. '\65'
=
'\065'
=
10
binary
53,
be
f '
American standard code for information interchange code
Code representation. single
Word, law.
d
'\028'
The same as above means octal number, but every eight octal numbers will enter one and will not appear.
eight
Yes, so the format is correct but the value is wrong. Illegal.