FPSC- Programmer (BS-17) - PMD High Yield - 2026 — Part 3 (100 Q)

Correct Answer: B. reserve only allocates capacity (size is unchanged); resize changes the size, creating elements
Explanation: After reserve(100), the size is still 0, so v[0] is undefined behavior. ALSO KNOW (related points): • In a C++ lambda, what is the difference between [=] and [&]? → [=] captures variables by value; [&] captures them by reference • What is the difference between std::endl and '\n'? → std::endl inserts a newline and flushes the stream; '\n' only inserts a newline

Correct Answer: A. 20
Explanation: r = y assigns y's value (20) to x. It does not make r refer to y. References cannot be reseated. ALSO KNOW (related points): • What does this print?: vector<int> v = {1, 2, 3};; for (int x : v) x *= 2;; cout << v[0]; → 1

Correct Answer: D. Declaring a function with the same name in Derived hides all the Base overloads of that name unless you write 'using Base::f;'
Explanation: This is called name hiding, and it often surprises developers coming from Java. ALSO KNOW (related points): • Which statement about std::unique_ptr is correct? → It cannot be copied, only moved (with std::move) • What does main() return in C++ if it reaches the end without a return statement? → 0, implicitly • Which statement about malloc and new is correct? → new calls the constructor (and delete calls the destructor); malloc and free do not • Can a pure virtual destructor (virtual ~Base() = 0;) be left without a definition? → No; it still needs a definition, because derived destructors call it • What is the result of using namespace std; in a header file? → It pollutes the global namespace of every file that includes the header, which risks name clashes

Correct Answer: A. a is a Variant; b is an Integer
Explanation: In VB6, each variable needs its own As clause. VB.NET changed this, so both would be Integer there. ALSO KNOW (related points): • Which operator performs exponentiation in Visual Basic? → ^ • What happens in VB6 with Dim x As Integer: x = 32767: x = x + 1? → Runtime error 6: Overflow • Which VB6 data type was replaced by Decimal in VB.NET for money calculations? → Currency

Correct Answer: D. 6 (indices 0 to 5)
Explanation: The number in parentheses is the upper bound, not the element count. ALSO KNOW (related points): • Which operator means 'not equal to' in Visual Basic? → <> • What happens in VB.NET by default when an Integer arithmetic operation overflows? → A System.OverflowException is thrown

Correct Answer: A. 3 and 3.5
Explanation: \ is integer division. / always performs floating-point division and returns a Double. ALSO KNOW (related points): • Is Visual Basic case-sensitive for identifiers and keywords? → No; myVar and MYVAR are the same identifier • What is VB.NET source code compiled into? → MSIL (CIL) bytecode, which the CLR JIT-compiles at run time

Correct Answer: D. 8 and "53"
Explanation: When one operand of + is numeric, VB converts the string to a number. & always concatenates. ALSO KNOW (related points): • Which keyword represents a null object reference in VB.NET? → Nothing • How are comments written in Visual Basic? → With an apostrophe (') or the REM keyword

Correct Answer: D. 2 and 4
Explanation: CInt uses banker's rounding: halves go to the nearest even number. ALSO KNOW (related points): • In what unit is a VB Timer control's Interval property set? → Milliseconds • What does the Static keyword do for a local variable in a VB procedure? → The variable keeps its value between calls to the procedure

Correct Answer: D. -3 and -2
Explanation: Int rounds down (toward negative infinity). Fix truncates toward zero. ALSO KNOW (related points): • What does ReDim Preserve allow in VB? → Resizing an array while keeping its data, but only the last dimension can be changed • Which keyword in VB refers to the current instance of a form or class? → Me

Correct Answer: C. VB6 passes ByRef by default; VB.NET passes ByVal by default
Explanation: Code migrated from VB6 can change behavior silently because of this difference. ALSO KNOW (related points): • Which property holds the text displayed by a Label in VB6 and in VB.NET? → Caption in VB6; Text in VB.NET • What is the VB6 equivalent of VB.NET's structured Try...Catch? → On Error GoTo label