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Advanced OOPs Concepts
Question 1
Which of the following correctly declares a lambda that adds two integers?
[](int a, int b) { return a + b; }
[int a, int b] -> int { return a + b; }
lambda(int a, int b) { return a + b; }
[] { int a, b; return a + b; }
Question 2
Which of the following is true about namespaces in C++?
You must put a semicolon after closing the namespace block
Namespaces can be extended (i.e. declared in parts) across multiple files or places
You can inherit one namespace from another
Namespaces allow you to define access specifiers (public/private) inside them
Question 3
Which of these is not a valid use of the const keyword in C++?
Marking a member function so it cannot modify the object’s state
Declaring a constant local variable whose value cannot be changed after initialization
Declaring a pointer such that the pointer’s address cannot be changed
Declaring a variable without initializing it and then assigning a value later
Question 5
Consider this lambda in C++:
int a = 5;
auto f = [=]() mutable {
a = 10;
return a;
};
int b = f();
What is the value of b, and does a in the outer scope change?
b = 10, and the outer a becomes 10
b = 10, but outer a remains 5
Compiler error (cannot assign to a)
b = 5, outer a remains 5
Question 6
Which of the following correctly describes the purpose of RTTI in C++?
It enables compile-time template specialization
It allows checking and casting types safely at runtime (e.g. using typeid or dynamic_cast)
It provides automatic memory management (garbage collection)
It ensures that only one object of a given class is created
Question 7
What happens if two namespaces contain variables with the same name and both are used in the same scope using using namespace?
The compiler automatically merges them
The variable from the first namespace is always chosen
Ambiguity error occurs at compile time
The variable from the second namespace overrides the first
Question 8
What is the output of the following code?
#include <iostream>
using namespace std;
void print(const int x) {
// x = x + 1; // Uncommenting this line will cause an error
cout << x;
}
int main() {
print(10);
return 0;
}
11
10
Compiler error
Undefined behavior
Question 9
What will be the output of the following code?
#include <iostream>
#include <typeinfo>
using namespace std;
class Base { virtual void f() {} };
class Derived : public Base {};
int main() {
Base* b = new Derived();
cout << typeid(*b).name();
return 0;
}
Base
Derived
*b
Runtime error
There are 9 questions to complete.