Program Assignment
Write a lexical analyzer which reads a C- program, strips off comments (denoted by /* comments */), and generates four symbol tablets.
1. The KEYWORD table includes all keywords defined in Louden, pp.491). Each keyword is associated with an index. You may combine the special symbols into the KeyWord table. You may hardcode them.
|
Keyword
|
Index
|
|
Else
|
1
|
|
If
|
2
|
|
int
|
3
|
2. The INDENTIFIER table includes all the user-defined identifiers. The table is similar to the keyword table except that it contains identifiers. Each identifier has its unique index.
3. The NUMBER table includes all integers and floats used in the program.
|
Num
|
index
|
attribute
|
|
60
|
1
|
integer
|
|
3.75
|
2
|
float
|
4. The TOKEN table includes all the tokens in the order that they are generated. The table should include the following information:
|
Token
|
class
|
index
|
|
Int
|
kw
|
3
|
|
Gcd
|
id
|
1
|
|
3.75
|
num
|
2
|
5. For the Regular Grammar for the tokens, refer to the Lexical Conventions of C- (Louden1). The input to your program is the example in Louden3 including the comments. Your program should strips off the comments.
6. The output from the program should include the program with comments stripped off. And all the tables mentioned above.
7. Please do file i/o, i.e. read the data from a file and send output to a file.