Consider the following ANSI C program:
int main() {
Integer x;
return 0;
}
Which one of the following phases in a seven-phase C compiler will throw an error?
Consider the following ANSI C program:
int main() {
Integer x;
return 0;
}Which one of the following phases in a seven-phase C compiler will throw an error?
Show Hint
- Lexical analyzer
- Syntax analyzer
- Semantic analyzer
- Machine dependent optimizer
The Correct Option is C
Solution and Explanation
Step 1: Lexical analysis.
The token \texttt{Integer} is a valid identifier in C, so the lexical analyzer will not flag any error.
Step 2: Syntax analysis.
The statement \texttt{Integer x;} follows the syntactic form of a declaration, so the syntax analyzer accepts it.
Step 3: Semantic analysis.
In ANSI C, \texttt{Integer} is not a predefined type (unlike \texttt{int}). Since \texttt{Integer} has not been declared as a type using \texttt{typedef}, this results in a semantic error (undeclared type identifier).
Step 4: Conclusion.
Therefore, the error is detected during semantic analysis.
Final Answer: (C)
Top Questions on Parsing
Consider the augmented grammar with \(\{+,* , (, ), id\}\) as the set of terminals. \[ S' \rightarrow S \] \[ S \rightarrow S + R \mid R \] \[ R \rightarrow R^{\,*} P \mid P \] \[ P \rightarrow (S) \mid id \] If \(I_0\) is the set of two LR(0) items \(\{[S' \rightarrow S.], [S \rightarrow S. + R]\}\), then \(goto(\text{closure}(I_0), +)\) contains exactly \(\underline{\hspace{1cm}}\) items.
- Which one of the following statements is TRUE?
Consider the following context-free grammar where the set of terminals is \(\{a,b,c,d,f\}\):
\[ S \rightarrow daT \mid Rf \] \[ T \rightarrow aS \mid baT \mid \epsilon \] \[ R \rightarrow caTR \mid \epsilon \] The following is a partially-filled LL(1) parsing table.
Which one of the following choices represents the correct combination for the numbered cells in the parsing table ("blank" denotes that the corresponding cell is empty)?
- Consider the following statements.
\[ S_1:\ \text{Every SLR(1) grammar is unambiguous but there are certain unambiguous grammars that are not SLR(1).} \] \[ S_2:\ \text{For any context-free grammar, there is a parser that takes at most } O(n^3) \text{ time to parse a string of length } n. \] Which one of the following options is correct? Consider the following augmented grammar with terminals {#, @, <, >, a, b, c}.
$S' → S$
$S → S\#cS$
$S → SS$
$S → S@$
$S → <S>$
$S → a$
$S → b$
$S → c$Let I0 = CLOSURE({ S' → • S }). The number of items in the set GOTO(GOTO(I0, <), <) is .
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