FPSC- Programmer (BS-17) - Pakistan Meteorological Department (PMD) Model Papers - 2026 — Part 7 (100 Q)

Correct Answer: A. 1
Explanation: The loop variable is a copy. Use for (int &x : v) to modify the elements.

Correct Answer: A. v1 has 5 elements (all 0); v2 has 1 element (5)
Explanation: Brace initialization prefers the initializer_list constructor. ALSO KNOW (related points): • Why can using an iterator after vector::push_back be dangerous? → If the vector reallocates, every iterator, pointer, and reference to its elements is invalidated • After cin >> age; the program calls getline(cin, name); and name comes out empty. Why? → The newline left in the input buffer by >> is read by getline as an empty line

Correct Answer: D. Compilation error, because two const char pointers cannot be added
Explanation: Use std::string("abc") + "def", or the literal "abc"s from C++14. Adjacent literals with no + between them ("abc" "def") are concatenated at compile time.

Correct Answer: B. The base class version
Explanation: During base construction the object's dynamic type is still Base, so virtual dispatch does not reach Derived yet. ALSO KNOW (related points): • In what order are data members initialized? → In the order they are declared in the class, regardless of the order of the initializer list • What does the 'Rule of Three' state? → A class that needs a user-defined destructor, copy constructor, or copy assignment operator probably needs all three • What may a const member function such as int get() const; do? → It cannot modify non-mutable data members of the object • What does the explicit keyword do on a single-argument constructor? → It prevents implicit conversions through that constructor • Which keyword makes a class non-inheritable (C++11)? → final

Correct Answer: D. Copying a Derived object into a Base object by value, which loses the Derived-specific parts
Explanation: Pass by reference or pointer to preserve polymorphism. ALSO KNOW (related points): • What is the purpose of #pragma once or #ifndef header guards? → To prevent a header's contents from being included more than once in a single translation unit

Correct Answer: B. In the order they are declared in the class, regardless of the order of the initializer list
Explanation: Compilers warn (-Wreorder) when the initializer list order differs from the declaration order.

Correct Answer: B. c, b, a
Explanation: Destruction happens in reverse order of construction.

Correct Answer: C. A class that needs a user-defined destructor, copy constructor, or copy assignment operator probably needs all three
Explanation: C++11 extends it to the 'Rule of Five' by adding the move constructor and move assignment operator.

Correct Answer: A. The scope resolution operator ::
Explanation: The operators that cannot be overloaded are ::, ., .*, ?:, sizeof, and typeid.

Correct Answer: C. 11
Explanation: The macro expands textually to 2+3*2+3 = 11. Write it as ((x)*(x)), or use an inline or constexpr function.