C++ Multiple Choice Questions for Experts

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Question: 26

The following code will fail to compile:

template <typename T, typename U>
void call_foo(T t, U u) {
  t.foo<U>(u);
}

How would you fix this?

(A) t.foo template<U>(u);
(B) t.foo<typename U>(u);
(C) t.template foo<U>(u);
(D) typename t.foo<U>(u);

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Level: Expert

Category of MCQ: other in C++

Question: 27

Which one is correct syntax to use C++11 features while compilation?

(A) g++ -std=c++-11 -o output.out source.cpp
(B) g++ -std=c++11 -o output.out source.cpp
(C) g++ -std=c++ 11 -o output.out source.cpp
(D) g++ -std=cpp11 -o output.out source.cpp

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Level: Expert

Category of MCQ: cpp11 in C++

Question: 28

In the below program 
int main(int argc, char *argv[]){}
what would be the value of argv[argc]?

(A) Filename
(B) First argument
(C) Last argument
(D) NULL pointer

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Level: Expert

Category of MCQ: other in C++

Question: 29

Which one of the following is correct syntax for nmake command?

(A) nmake -f myfile option
(B) nmake -f opiton myfile
(C) nmake option -f myfile
(D) nmake option -fname myfile

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Level: Expert

Category of MCQ: gcc_g++ in C++

Question: 30

What should be output of below program? program is compiled on g++ compiler.

#include<iostream>
using namespace std;

struct student{	
 char a;  char b;  int c;
};

int main()
{
 cout<<sizeof(student);	
 return 0;
}

(A) 4
(B) 6
(C) 8
(D) 12

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Level: Expert

Category of MCQ: structure in C++

Question: 31

#include<iostream>
using namespace std;

struct student{	
 char a; int c;	char b;
};

int main()
{
    std::cout<<sizeof(student);	
    return 0;
}

(A) 4
(B) 6
(C) 8
(D) 12

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Level: Expert

Category of MCQ: structure in C++

Question: 32

#include<iostream>


struct student{	
    int a; char b; char c;
};

int main()
{
    std::cout<<sizeof(student);	
    return 0;
}

(A) 4
(B) 6
(C) 8
(D) 12

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Level: Expert

Category of MCQ: structure in C++

Question: 33

Is below program of C++ 11 valid & runs without compilation error?
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

void print_square(int i)
{
 cout << i*i << endl;
}
int main()
{
 vector<int> v;
 // vector gets filled
 for_each(v.begin(), v.end(), print_square);
 return 0;
}

(A) Yes
(B) No
(C) Depends on Compiler

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Level: Expert

Category of MCQ: cpp11 in C++

Question: 34

Is this valid C++ 11 program & get compiled without any error?

#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {

vector<int> v;
// vector gets filled

for_each(v.begin(), v.end(),
[](int i) { cout << i*i << endl; } );

return 0;
}

(A) Yes
(B) No

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Level: Expert

Category of MCQ: cpp11 in C++

Question: 35

If I want use multiple modes in open() function while file handling then which operator is used for this?

(A) ios::out | ios::in
(B) ios::out, ios::in
(C) ios::out || ios::in
(D) ios::out & ios::in

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Level: Expert

Category of MCQ: filehandling in C++

Question: 36

Which is the correct command used to compile source code (.cpp files) into object code(.o files)?

(A) g++ -o <filename>
(B) g++ -c <filename>
(C) g++ <filename>
(D) g++ -f <filename>

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Level: Expert

Category of MCQ: gcc_g++ in C++

Question: 37

The command nm on linux lists few symbols. What symbol 'D'represents?

(A) Normal Data Section
(B) Un initialized data section
(C) Initialized data section
(D) None of the above

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Level: Expert

Category of MCQ: other in C++

Question: 38

Which of the following is not a C++ 17 library feature?

(A) std::variant
(B) std::optional
(C) std::string_view
(D) None of the above

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Level: Expert

Category of MCQ: cpp17 in C++

Question: 39

Is this a valid syntax in C++ 17?

namespace A::B::C {
  int i;
}

(A) Yes
(B) No

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Level: Expert

Category of MCQ: cpp17 in C++

Question: 40

Is this is a valid UTF-8 character literal? 

char x = u8'x';

(A) Yes
(B) No

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Level: Expert

Category of MCQ: cpp17 in C++

Question: 41

Lambda expression are feature of which C++ version?

(A) C++11
(B) C++14
(C) C++ 17
(D) C++20

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Level: Expert

Category of MCQ: cpp14 in C++

Question: 42

Which C++ version support Digit Separators 1'000'000?

(A) C++11
(B) C++14
(C) C++17
(D) C++20

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Level: Expert

Category of MCQ: cpp20 in C++

Question: 43

Which version of C++ added feature of auto for return type of functions?

(A) C++11
(B) C++14
(C) C++17
(D) C++20

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Level: Expert

Category of MCQ: cpp20 in C++

Question: 44

In which version of C++ auto was limited to lambda functions?

(A) C++11
(B) C++14
(C) C++17
(D) C++20

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Level: Expert

Category of MCQ: cpp20 in C++

Question: 45

Correct syntax for creating a thread using Function Pointer?
thread_function is the name of function which need to be executed
in separate thread.

(A) std::thread threadObj(thread_function);
(B) std::thread threadObj(&thread_function);
(C) std::thread threadObj((void *)thread_function);
(D) std::thread threadObj(thread_function());

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Level: Expert

Category of MCQ: cpp11 in C++

Question: 46

Closing a file causes any unsaved information still held in the file buffer to be saved to the file.

(A) TRUE
(B) FALSE

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Level: Expert

Category of MCQ: filehandling in C++

Question: 47

Exceptions can be ignored

(A) True
(B) False

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Category of MCQ: exceptions in C++

Question: 48

#include<iostream>
using namespace std;

class Country{
private: int population;

public: void setPopulation(int pop){
             this->population = pop;
          }
         int getPopulation(){
             return this->population;
         }
};

class USA: private Country{

};

int main(){
USA obj;
obj.setPopulation(100);
cout<<obj.getPopulation();
return 0;
}

(A) 100
(B) 0
(C) Compilation Error
(D) Garbage Value is printed

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Level: Expert

Category of MCQ: inheritance in C++

Question: 49

How to transfer the ownership of unique_ptrs?

(A) We can't transfer the ownership of unique pointers
(B) It is possible using copy constructor - unique_ptr<Thing> ptr2(ptr1);
(C) ptr2 = std::move(ptr1);
(D) ptr2 = ptr1

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Level: Expert

Category of MCQ: pointers in C++

Question: 50

//if the size of a is 4 bytes then find the output of below code 

#include<iostream>

class cppbuzz{
    private: int a;
    public: virtual void myfunc()=0;
};

int main(){
    std::cout<<sizeof(cppbuzz);
    return 0;
}

(A) 4
(B) 8
(C) 12
(D) 16

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Level: Expert

Category of MCQ: abstract_class in C++

Question: 51

#include<iostream>
using namespace std;

class Test
{
private: int x, y;
public:
        Test():y(10),x(y+10)
        {
        }
        
       void print()
       {
          cout<<x<<", "<<y;
       } 
};

int main()
{
Test *a = new Test();
a->print();

delete a;

return 0;
}

(A) Compilation Error
(B) 10, 20
(C) 10, 10
(D) 10, Undfefined Value

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Level: Expert

Category of MCQ: classesAndobjects in C++

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