Number of tokens in the C program

Question

Given answer is 25, while my answer is 26, they have considered -10.0 as single token, which is wrong?

Comments

yes, it should be 26.

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1. Keywords               (int, while,etc),
2. Identifiers               ( main, total,etc),
3. Constants              ( 10, 20),
4. Strings                    ( “total”, “hello”),
5. Special symbols  ( (,), {,} etc),
6. Operators              ( +, /,-,*,etc)

So yes 26. Minus is included.

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But floating point constants are also allowed right @manu00x , @Joshi_nItIsh , @Warlock lord ?

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https://stackoverflow.com/questions/26529711/how-to-differentiate-operator-from-a-negative-number-for-a-tokenizer

Answer 1

Ans is 25

i think you done mistak -10.0 take tow token but only 1.

Lexical analyzer checks for a longest valid lexeme which matches the pattern in case of "<=", it is the longest valid pattern so it will see "-10.0" as one pattern (as it is also a longest valid pattern).

Comments

srestha

lexical analysis, syntax analysis and symantic checking

all happens in lexer ??

 

Why? then what is the use of parser if lexer will do syntax analysis.

and parsers with SDD does semantic checking right ? Shaik Masthan

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you are right @Aakash_

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yes

lexical analysis for lexical error

parser for syntax error

semantic analyzer for semantic error

now right?