Step 1: Understanding intermediate representations.
Intermediate representations (IRs) are used by the compiler to represent the structure and semantics of the source program in a form suitable for analysis and optimization.
Step 2: Analysis of options.
Three address code is a linear, low-level intermediate representation used for optimization and code generation.
Abstract Syntax Tree (AST) represents the hierarchical syntactic structure of the program and is an intermediate form.
Control Flow Graph (CFG) represents the flow of control between basic blocks and is also an intermediate representation.
The symbol table, however, is a data structure used to store information about identifiers, such as variable names, types, and scopes. It is not an intermediate representation of the program itself.
Step 3: Conclusion.
Hence, the symbol table is NOT an intermediate representation.
Consider the following statements about the use of backpatching in a compiler for intermediate code generation:
1. Backpatching can be used to generate code for Boolean expressions in one pass.
2. Backpatching can be used to generate code for flow-of-control statements in one pass.
Which ONE of the following options is CORRECT?
For a statement \(S\) in a program, in the context of liveness analysis, the following sets are defined:
\(USE(S)\) : the set of variables used in \(S\)
\(IN(S)\) : the set of variables that are live at the entry of \(S\)
\(OUT(S)\) : the set of variables that are live at the exit of \(S\)
Consider a basic block that consists of two statements, \(S_1\) followed by \(S_2\). Which one of the following statements is correct?
Consider the following ANSI C code segment:
z = x + 3 + y->f1 + y->f2;
for (i = 0; i < 200; i = i + 2){
if (z > i) {
p = p + x + 3;
q = q + y->f1;
} else {
p = p + y->f2;
q = q + x + 3;
}
} Assume that the variable \(y\) points to a struct (allocated on the heap) containing two fields \(f1\) and \(f2\), and the local variables \(x, y, z, p, q,\) and \(i\) are allotted registers. Common sub-expression elimination (CSE) optimization is applied on the code. The number of addition and dereference operations (of the form \(y \rightarrow f1\) or \(y \rightarrow f2\)) in the optimized code, respectively, are:
In the diagram, the lines QR and ST are parallel to each other. The shortest distance between these two lines is half the shortest distance between the point P and the line QR. What is the ratio of the area of the triangle PST to the area of the trapezium SQRT?
Note: The figure shown is representative

A square paper, shown in figure (I), is folded along the dotted lines as shown in figures (II) and (III). Then a few cuts are made as shown in figure (IV). Which one of the following patterns will be obtained when the paper is unfolded?
Consider the relationships among P, Q, R, S, and T:
• P is the brother of Q.
• S is the daughter of Q.
• T is the sister of S.
• R is the mother of Q.
The following statements are made based on the relationships given above.
(1) R is the grandmother of S.
(2) P is the uncle of S and T.
(3) R has only one son.
(4) Q has only one daughter.
Which one of the following options is correct?