Lexical vs Syntax Error

Question

 

Comments

Yeah brother that would be really helpful

---

i don't have it, but this may helps you.

Limitations of Syntax Analyzers

 in the link https://www.tutorialspoint.com/compiler_design/compiler_design_syntax_analysis.htm

 

Semantic Errors

in the link https://www.tutorialspoint.com/compiler_design/compiler_design_semantic_analysis.htm

 

https://www.tutorialspoint.com/compiler_design/compiler_design_error_recovery.htm

---

this page is really helpful

https://www.geeksforgeeks.org/error-detection-recovery-compiler/

Answer 1

OPTION C, is the answer.

Because an identifier must always start with an underscore or a letter. Since  (1ab2) starts with a number, it obviously gives a lexical error.

Other explaination:

Since OPTION A is correct, A and D are ruled out.

and in OPTION B, (in t a b;), we get 5 tokens.

Answer 2

• Lexical : name of some identifier typed incorrectly

• Syntactical : missing semicolon or unbalanced parenthesis

• Semantical : incompatible value assignment

• Logical : code not reachable, infinite loop

Answer 3

Option C, int 1ab2;, has a lexical error during compilation.

In C and many other programming languages, variable names must begin with a letter or an underscore and can be followed by any combination of letters, digits, and underscores. The variable name 1ab2 starts with a digit, which is not allowed. Therefore, the compiler will report a lexical error during the compilation process.

Option A, int a b;, and option B, in t a b;, both have syntax errors but not lexical errors. In both cases, there is a missing comma between the two variable names, which violates the syntax rules of C. Therefore, the compiler will report a syntax error during the compilation process.

Therefore, the correct answer is option C, int 1ab2;.