CMPS-104A • Compiler Design I • 2005 Fall • Test #1
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Please PRINT using keyboard letters :
Name :
Login :
@ucsc.edu
Total / 30
Closed book.
No notes.
No computer.
Answer ONLY in the spaces provided. Neatness counts !
Do your scratch
work elsewhere and only enter your final answer into the spaces provided.
1. Write
flex
regexes for each of the following. Do not assume, define, or use any macros.
[5
✔
]
i. A string which begins with a quote (
"
) or an apostrophe (
’
) and ends with the same character that it begins
with, and contains inside of it any number of characters except for the newline (
\n
) character or the kind of
character that delimits the string.
ii. An identifier which consists of one or more upper- or lower-case letters, digits, and underscores (
_
) but
may not begin with a digit.
In addition, an underscore may not be the first character, nor the last, nor
appear adjacent to another underscore.
iii. A comment in C++ or Java which begins with two slash (
/
) characters followed by zero or more characters
up to, but not including a newline (
\n
) character.
iv.
A string consisting of an odd number of occurrences of the letter
x
followed by an odd number of occur-
rences of the letter
y
.
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- Spring '08
- MACKEY
- Regular expression, Context-free grammar, Parsing expression grammar, flex regexes, flex regex
-
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