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GO Classes DPP | COMPILER|COMPILATION PHASES

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4 4 votes

Consider the following snippet of C code

int main() { /* Line 1 */
    int x = 10, y = 5; /* Line 2 */
    int result; /* Line 3 */
    reslt = x + y; /* Line 4 */
}


Identify the compiler's primary response during the compilation process:

  1. NO COMPILATION ERROR
     
  2. A LEXICAL ERROR
     
  3. A SYNTACTIC ERROR
     
  4. A SEMANTIC ERROR

3 Answers

2 2 votes

LEXICAL ANALYSIS: The scanner sees $\verb|reslt|$ and identifies it as a valid identifier (a string of characters starting with a letter). It does not care if the variable was declared yet. Therefore, there is no lexical error.

SYNTACTIC ANALYSIS: The parser checks the structure. It sees $\verb|identifier = identifier + identifier;|$ . This follows the correct grammar for an assignment statement in C. Therefore, there is no syntax error.

SEMANTIC ANALYSIS: This is where the compiler checks the Symbol Table. It looks for the declaration of $\verb|reslt|$. Since only $\verb|result|$ (spelled differently) was declared, the compiler realizes $\verb|reslt|$ is an "undeclared identifier." This is a Semantic Error.

Correct Answer: D. A SEMANTIC ERROR

0 0 votes
for line 3 and line 4  
lexical analyzer interpreted as identifiers so it can easily pass the lexical analyzer
for syntax analyzer  line 3 and line 4 will check for grammar, and it is will be passed as there is no error in grammar
for semantic analysis ,analyzer matches with symbol table and found that reslt is not declared so it gives semantc error
so option D
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