C++ MCQ

The access specifier for members x of a class in C++?
class Sample {

int x;

};

• public

• private

• protected

• None of the above

Consider the code below. What will it print?
class Demo {

public:

int a;

};

int main() {

Demo d;

d.a = 10;

std::cout << d.a;

return 0;

}

• 0

• 10

• 
  Garbage value
  

• Compilation error

What is the lifetime of a local object inside a function?

• Entire program execution

• Only until function exits

• Until program ends

• Until another object is created

Which object is destroyed automatically at the end of program?

• Local object

• Static object inside function

• Global object

• Dynamic object

What is the correct way to access a static member without creating an object?

• Sample s; s.x;

• Sample::x;

• s.x;

• static Sample::x;

Which of the following is TRUE?

• Static variable inside a class cannot be private
  

• Static variable belongs to class, not object
  

• Local objects persist throughout program
  

• Global objects are destroyed after main

What will be the output of this code?

#include <iostream>

class Test {

public:

Test() { std::cout << "Hello"; }

};

int main() {

static Test t;

}

• Nothing
  

• Hello
  

• Hello Hello
  

• Compilation error

Predict the output:

#include <iostream>

class Test {

public:

int x;

Test(int val) { x = val; }

};

int main() {

Test t(5);

std::cout << t.x;

return 0;

}

• 0
  

• 5
  

• Garbage value
  

• Compilation error

Which statement about static inside a function is TRUE?

• Static local variables are created each time the function is called
  

• Static local variables are destroyed when function ends
  

• Static local variables are initialized only once
  

• Static local variables must be global

Which of the following is TRUE about inline functions in C++?

• They always increase execution speed
  

• The compiler must expand them inline
  

• They may increase code size due to duplication
  

• Inline functions cannot be recursive