Are you a C++ whiz looking for a challenge? Look no further! Our expert-level C++ quiz is here to put your skills to the test. From memory management to template metaprogramming, we’ve got questions that will push your knowledge to the limit.
Get ready to dive deep into the world of C++ with our challenging quiz. Think you’ve got what it takes to emerge victorious? Let’s find out!
Question 1: Memory Management
#include <iostream>
int main() {
int* ptr = new int[5];
ptr++;
delete[] ptr;
return 0;
}
What will be the outcome of the code snippet?
- A) Memory leak
- B) Compiler error
- C) Runtime error
- D) No effect
Question 2: Template Metaprogramming
#include <iostream>
template<int N>
struct Fibonacci {
static const int value = Fibonacci<N - 1>::value + Fibonacci<N - 2>::value;
};
template<>
struct Fibonacci<1> {
static const int value = 1;
};
template<>
struct Fibonacci<0> {
static const int value = 0;
};
int main() {
std::cout << Fibonacci<10>::value << std::endl;
return 0;
}
What will be the output of the code snippet?
- A) 21
- B) 34
- C) 55
- D) Compiler error
Question 3: Smart Pointers
#include <iostream>
#include <memory>
class MyClass {
public:
MyClass() { std::cout << "Constructor called" << std::endl; }
~MyClass() { std::cout << "Destructor called" << std::endl; }
};
int main() {
std::unique_ptr<MyClass> ptr1(new MyClass());
std::unique_ptr<MyClass> ptr2;
ptr2 = std::move(ptr1);
return 0;
}
What will be the output of the code snippet?
- A) Constructor called, Destructor called
- B) Constructor called
- C) Destructor called
- D) Compiler error
Question 4: Move Semantics
#include <iostream>
#include <utility>
class MyClass {
public:
MyClass() { std::cout << "Constructor called" << std::endl; }
MyClass(const MyClass&) { std::cout << "Copy constructor called" << std::endl; }
MyClass(MyClass&&) { std::cout << "Move constructor called" << std::endl; }
};
int main() {
MyClass obj1;
MyClass obj2 = std::move(obj1);
return 0;
}
What will be the output of the code snippet?
- A) Constructor called
- B) Constructor called, Move constructor called
- C) Constructor called, Copy constructor called
- D) Constructor called, Move constructor called, Destructor called
Question 5: Lambda Expressions
#include <iostream>
int main() {
int x = 5;
auto func = [&x](int y) { return x + y; };
x = 10;
std::cout << func(3) << std::endl;
return 0;
}
What will be the output of the code snippet?
- A) 8
- B) 15
- C) 18
- D) Compiler error
Question 6: Exception Handling
#include <iostream>
int main() {
try {
throw std::runtime_error("Exception occurred");
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
} catch (...) {
std::cerr << "Unknown exception" << std::endl;
}
return 0;
}
What will be the output of the code snippet?
- A) Exception occurred
- B) Unknown exception
- C) Runtime error
- D) Compiler error
Question 7: Type Traits
#include <iostream>
#include <type_traits>
int main() {
std::cout << std::boolalpha;
std::cout << std::is_pointer<int*>::value << std::endl;
std::cout << std::is_pointer<std::shared_ptr<int>>::value << std::endl;
return 0;
}
What will be the output of the code snippet?
- A) false, true
- B) true, false
- C) true, true
- D) false, false
Question 8: Variadic Templates
#include <iostream>
template<typename T>
void print(T arg) {
std::cout << arg << std::endl;
}
template<typename T, typename... Args>
void print(T first, Args... args) {
std::cout << first << " ";
print(args...);
}
int main() {
print(1, 2, 3, 4, "Hello");
return 0;
}
What will be the output of the code snippet?
- A) 1 2 3 4 Hello
- B) Hello 4 3 2 1
- C) 1 2 3 4
- D) Compiler error
Question 9: Type Inference
#include <iostream>
template<typename T, typename U>
auto add(T x, U y) -> decltype(x + y) {
return x + y;
}
int main() {
auto result = add(5, 3.5);
std::cout << result << std::endl;
return 0;
}
What will be the output of the code snippet?
- A) 8.5
- B) 8
- C) Compiler error
- D) Undefined behavior
Question 10: Advanced OOP Concepts
#include <iostream>
class Base {
public:
virtual void display() const {
std::cout << "Base display" << std::endl;
}
};
class Derived : public Base {
public:
void display() const override {
std::cout << "Derived display" << std::endl;
}
};
int main() {
const Base* ptr = new Derived();
ptr->display();
delete ptr;
return 0;
}
What will be the output of the code snippet?
- A) Base display
- B) Derived display
- C) Compiler error
- D) Undefined behavior
Answers Revealed: How Did You Fare?
Curious about your performance in our expert-level C++ quiz? The wait is over! Dive into the answers below to see how you tackled the toughest challenges in the world of C++. Did you emerge as a true expert, or are there areas for improvement? Let’s uncover the results!
- Memory Management: A) Memory leak
- Explanation: The pointer
ptr
is incremented before deleting it, causing the pointer to lose track of the original allocated memory block. This leads to a memory leak as the memory block is not deallocated before the program terminates.
2. Template Metaprogramming: C) 55
- Explanation: This code snippet uses template specialization to calculate the Fibonacci sequence at compile-time.
Fibonacci<10>::value
recursively expands until it reachesFibonacci<1>::value
andFibonacci<0>::value
, ultimately resulting in the value55
.
3. Smart Pointers: D) Compiler error
- Explanation:
std::unique_ptr
does not allow copy operations. When attempting to assignptr1
toptr2
usingstd::move
, it tries to perform a copy, resulting in a compiler error.
4. Move Semantics: B) Constructor called, Move constructor called
- Explanation:
obj1
is constructed, and thenobj2
is initialized with the move constructor, which is called due tostd::move(obj1)
.
5. Lambda Expressions: A) 8
- Explanation: The lambda captures
x
by reference. Whenx
is modified to 10, the lambda still uses the updated value ofx
, resulting in10 + 3 = 8
.
6. Exception Handling: A) Exception occurred
- Explanation: The code snippet throws a
std::runtime_error
exception, which is caught by thecatch
block, printing the error message "Exception occurred".
7. Type Traits: A) false, true
- Explanation: The code snippet uses
std::is_pointer
to check if the types are pointers. The firststd::is_pointer<int*>::value
evaluates tofalse
, while the secondstd::is_pointer<std::shared_ptr<int>>::value
evaluates totrue
.
8. Variadic Templates: A) 1 2 3 4 Hello
- Explanation: This code snippet uses variadic templates to recursively print each argument passed to the
print
function. The output is1 2 3 4 Hello
.
9. Type Inference: A) 8.5
- Explanation: The
add
function uses type inference to deduce the return type based on the types of its parameters. In this case,decltype(x + y)
deduces the return type to bedouble
, resulting in8.5
.
10. Advanced OOP Concepts: A) Base display
- Explanation: Although the object pointed to by
ptr
is of typeDerived
, the member functiondisplay()
is not declared asvirtual
in the base classBase
. Therefore, the function called is determined at compile-time based on the static type of the pointer, resulting in the output "Base display".
Wrapping Up: Keep Coding, Keep Learning
That’s a wrap on our expert C++ quiz. Whether you conquered every challenge or hit a few roadblocks, your journey through the depths of C++ is complete. Keep coding, keep learning, and stay sharp.
Quick Tip: To improve your C++ skills, practice regularly by working on challenging projects, exploring advanced topics, and diving into open-source contributions. Continuously seek out resources such as books, tutorials, and online communities to deepen your understanding and stay up-to-date with the latest developments in the world of C++.