{"id":10096,"date":"2023-05-01T06:19:50","date_gmt":"2023-05-01T06:19:50","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10096"},"modified":"2023-06-19T13:30:01","modified_gmt":"2023-06-19T13:30:01","slug":"top-50-c-interview-questions-with-answers-2","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-c-interview-questions-with-answers-2\/","title":{"rendered":"Top 50 C++ Interview Questions with Answers"},"content":{"rendered":"
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C++ Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n

1) What is the size of a character in C++?<\/h3>\n\n\n\n

a) 8 bits
b) 16 bits
c) 32 bits
d) 64 bits<\/p>\n\n\n\n

Answer: a) 8 bits<\/h4>\n\n\n\n

2) Which of the following is the correct syntax for declaring a pointer?<\/h3>\n\n\n\n

a) int *p;
b) *int p;
c) int p*;
d) *p int;<\/p>\n\n\n\n

Answer: a) int *p;<\/h4>\n\n\n\n

3) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 20;
a = a ^ b;
b = a ^ b;
a = a ^ b;
std::cout << a << ” ” << b;
a) 20 10
b) 30 20
c) 10 20
d) 20 30<\/p>\n\n\n\n

Answer: a) 20 10<\/h4>\n\n\n\n

4) Which of the following is a correct way to allocate an integer array of size 10 on the heap?<\/h3>\n\n\n\n

a) int array[10];
b) int *array = new int[10]();
c) int *array = new int(10);
d) int array = new int[10];<\/p>\n\n\n\n

Answer: b) int *array = new int[10]();<\/h4>\n\n\n\n

5) What is the output of the following code?<\/h3>\n\n\n\n

int x = 10, y = 5;
std::cout << (x > y ? (x < 15 ? 1 : 2) : 0);
a) 0
b) 1
c) 2
d) Compilation error<\/p>\n\n\n\n

Answer: b) 1<\/h4>\n\n\n\n

6) Which of the following statements is true about the const keyword in C++?<\/h3>\n\n\n\n

a) It can be used to declare a constant variable.
b) It can be used to declare a function parameter that cannot be modified.
c) It can be used to declare a function return value that cannot be modified.
d) All of the above<\/p>\n\n\n\n

Answer: d) All of the above<\/h4>\n\n\n\n

7) Which of the following is the correct way to declare a virtual function in C++?<\/h3>\n\n\n\n

a) virtual int foo();
b) virtual int foo(void);
c) virtual int foo() = 0;
d) virtual int foo() const;<\/p>\n\n\n\n

Answer: a) virtual int foo();<\/h4>\n\n\n\n

8) Which of the following is the correct syntax to open a file in C++?<\/h3>\n\n\n\n

a) std::filestream myFile(“filename”, mode);
b) std::fstream myFile(“filename”, mode);
c) std::ifstream myFile(“filename”, mode);
d) Both b and c<\/p>\n\n\n\n

Answer: d) Both b and c<\/h4>\n\n\n\n

9) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 5;
int &refA = a, &refB = b;
refA = refB;
std::cout << a << ” ” << b;
a) 5 10
b) 10 5
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: a) 5 10<\/h4>\n\n\n\n

10) Which of the following statements about templates in C++ is true?<\/h3>\n\n\n\n

a) They allow generic programming in C++.
b) They provide a way to define a common functionality for different data types.
c) They can be used to define functions or classes.
d) All of the above<\/p>\n\n\n\n

Answer: d) All of the above<\/h4>\n\n\n\n

11) Which of the following is the correct syntax to pass an array to a function in C++?<\/h3>\n\n\n\n

a) void func(int * arr, int size);
b) void func(int arr[], int size);
c) void func(int arr[10], int size);
d) All of the above<\/p>\n\n\n\n

Answer: b) void func(int arr[], int size);<\/h4>\n\n\n\n

12) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 5, c = 2;
std::cout << (a > b) << ” ” << (a < b) << ” ” << (a == b) << ” ” << (a >= c) << ” ” << (b <= c);
a) 1 0 0 1 0
b) 1 0 0 0 0
c) 0 1 0 1 1
d) Compilation error<\/p>\n\n\n\n

Answer: a) 1 0 0 1 0<\/h4>\n\n\n\n

13) What is a destructor in C++?<\/h3>\n\n\n\n

a) A function that is called automatically when an object is created.
b) A function that is called automatically when an object is destroyed.
c) A function that is called manually to destroy an object.
d) A function that is used to initialize an object.<\/p>\n\n\n\n

Answer: b) A function that is called automatically when an object is destroyed.<\/h4>\n\n\n\n

14) Which of the following is the correct syntax to define a class in C++?<\/h3>\n\n\n\n

a) class MyClass { public: int foo(); };
b) class MyClass() { public: int foo(); };
c) class MyClass { int foo(); };
d) class { int foo(); };<\/p>\n\n\n\n

Answer: a) class MyClass { public: int foo(); };<\/h4>\n\n\n\n

15) What is the output of the following code?<\/h3>\n\n\n\n

std::cout << sizeof(“hello world”);
a) 11
b) 12
c) 13
d) Compilation error<\/p>\n\n\n\n

Answer: b) 12<\/h4>\n\n\n\n

16) Which of the following is the correct syntax to declare an enumeration in C++?<\/h3>\n\n\n\n

a) enum { RED, GREEN, BLUE };
b) enum colors { RED, GREEN, BLUE };
c) enum colors { RED = 1, GREEN = 2, BLUE = 3 };
d) Both b and c<\/p>\n\n\n\n

Answer: d) Both b and c<\/h4>\n\n\n\n

17) What is the output of the following code?<\/h3>\n\n\n\n

int arr[] = {1, 2, 3, 4, 5};
std::cout << sizeof(arr) \/ sizeof(arr[0]);
a) 1
b) 2
c) 3
d) 5<\/p>\n\n\n\n

Answer: d) 5<\/h4>\n\n\n\n

18) What is the output of the following code?<\/h3>\n\n\n\n

int arr[] = {1, 2, 3, 4, 5};
int *ptr = arr;
std::cout << *ptr << ” ” << *(ptr + 3) << ” ” << *(arr + 4);
a) 1 3 5
b) 1 4 5
c) 1 4 4
d) 1 4 1<\/p>\n\n\n\n

Answer: b) 1 4 5<\/h4>\n\n\n\n

19) What is a template specialization in C++?<\/h3>\n\n\n\n

a) It is a way to define a function or class for a specific data type.
b) It is a way to define a function or class for a generic data type.
c) It is a way to define a function or class for multiple data types at once.
d) It is a way to define a function or class for a derived data type.<\/p>\n\n\n\n

Answer: a) It is a way to define a function or class for a specific data type.<\/h4>\n\n\n\n

20) Which of the following is an example of dynamic polymorphism in C++?<\/h3>\n\n\n\n

a) Function overloading
b) Constructor overloading
c) Operator overloading
d) Virtual functions<\/p>\n\n\n\n

Answer: d) Virtual functions<\/h4>\n\n\n\n

21) Which of the following is not a type of inheritance in C++?<\/h3>\n\n\n\n

a) Public inheritance
b) Protected inheritance
c) Private inheritance
d) Multiple inheritance
e) All of the above are types of inheritance<\/p>\n\n\n\n

Answer: e) All of the above are types of inheritance<\/h4>\n\n\n\n

22) Which of the following is the correct way to declare a member function of a class outside the class definition in C++?<\/h3>\n\n\n\n

a) void MyClass::foo() { }
b) void foo() { }
c) MyClass::void foo() { }
d) MyClass::foo() { }<\/p>\n\n\n\n

Answer: a) void MyClass::foo() { }<\/h4>\n\n\n\n

23) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 20, c;
c = a++ + –b;
std::cout << a << ” ” << b << ” ” << c;
a) 10 20 30
b) 11 20 30
c) 10 19 30
d) 11 19 30<\/p>\n\n\n\n

Answer: c) 10 19 30<\/h4>\n\n\n\n

24) Which of the following is the correct syntax to define a destructor in C++?<\/h3>\n\n\n\n

a) ~ MyClass { }
b) ~MyClass() { }
c) MyClass::~() { }
d) Both a and b<\/p>\n\n\n\n

Answer: b) ~MyClass() { }<\/h4>\n\n\n\n

25) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 20;
std::swap(a, b);
std::cout << a << ” ” << b;
a) 10 20
b) 20 10
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: b) 20 10<\/h4>\n\n\n\n

26) Which of the following is the correct syntax to create a thread in C++?<\/h3>\n\n\n\n

a) std::thread myThread = new std::thread(foo);
b) std::thread myThread(foo);
c) std::thread myThread = std::thread::create(foo);
d) None of the above<\/p>\n\n\n\n

Answer: b) std::thread myThread(foo);<\/h4>\n\n\n\n

27) What is the output of the following code?<\/h3>\n\n\n\n

int arr[] = {1, 2, 3, 4, 5};
for (int i : arr) {
std::cout << i << ” “;
}
a) 1 2 3 4 5
b) 5 4 3 2 1
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: a) 1 2 3 4 5<\/h4>\n\n\n\n

28) Which of the following is a correct way to include a header file in C++?<\/h3>\n\n\n\n

a) #include “myFile.h”
b) #include
c) #include
d) Both a and b<\/p>\n\n\n\n

Answer: d) Both a and b<\/h4>\n\n\n\n

29) What is the output of the following code?<\/h3>\n\n\n\n

int arr[] = {1, 2, 3, 4, 5};
std::cout << arr << ” ” << &arr[0];
a) Same memory address
b) Different memory addresses
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: a) Same memory address<\/h4>\n\n\n\n

30) Which of the following is the correct syntax to declare a constant pointer in C++?<\/h3>\n\n\n\n

a) int * const ptr = &x;
b) const int * ptr = &x;
c) const int * const ptr = &x;
d) Both a and c<\/p>\n\n\n\n

Answer: d) Both a and c<\/h4>\n\n\n\n

31) What is the output of the following code?<\/h3>\n\n\n\n

int arr[] = {1, 2, 3, 4, 5};
int *ptr = arr;
std::cout << arr + 4 << ” ” << ptr + 4;
a) Same memory address
b) Different memory addresses
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: a) Same memory address<\/h4>\n\n\n\n

32) Which of the following is the correct syntax for a lambda function in C++?<\/h3>\n\n\n\n

a) []() { }
b) [](int x) { return x * x; }
c) [x, y](int z) { return x + y + z; }
d) All of the above<\/p>\n\n\n\n

Answer: d) All of the above<\/h4>\n\n\n\n

33) Which of the following is the correct syntax to declare a base class in C++?<\/h3>\n\n\n\n

a) class Base { protected: int x; }
b) class Base : protected { int x; }
c) class Base { public: int x; }
d) class Base : public { int x; }<\/p>\n\n\n\n

Answer: c) class Base { public: int x; }<\/h4>\n\n\n\n

34) What is a singleton in C++?<\/h3>\n\n\n\n

a) It is a design pattern that restricts the instantiation of a class to one object.
b) It is a class that can be instantiated multiple times.
c) It is a class that is derived from another class.
d) It is a function that takes a single argument as input.<\/p>\n\n\n\n

Answer: a) It is a design pattern that restricts the instantiation of a class to one object.<\/h4>\n\n\n\n

35) What is the output of the following code?<\/h3>\n\n\n\n

int a = {10}, b = {20};
std::cout << a << ” ” << b;
a) 10 20
b) {10} {20}
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: a) 10 20<\/h4>\n\n\n\n

36) Which of the following is the correct syntax for a copy constructor in C++?<\/h3>\n\n\n\n

a) MyClass(MyClass &obj) { }
b) MyClass(MyClass obj) { }
c) MyClass(MyClass const &obj) { }
d) Both a and c<\/p>\n\n\n\n

Answer: c) MyClass(MyClass const &obj) { }<\/h4>\n\n\n\n

37) What is the output of the following code?<\/h3>\n\n\n\n

int arr[] = {1, 2, 3, 4, 5};
int *ptr = &arr[2];
std::cout << ptr[-2] << ” ” << *(ptr + 2);
a) 1 5
b) 2 4
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: b) 2 4<\/h4>\n\n\n\n

38) Which of the following is the correct syntax to call a superclass constructor in C++?<\/h3>\n\n\n\n

a) SuperClass();
b) SuperClass::constructor();
c) SuperClass::SuperClass();
d) Both b and c<\/p>\n\n\n\n

Answer: c) SuperClass::SuperClass();<\/h4>\n\n\n\n

39) What is the output of the following code?<\/h3>\n\n\n\n

int x = 10;
int *ptr1 = &x, *ptr2 = &x;
std::cout << (ptr1 == ptr2) << ” ” << (*ptr1 == *ptr2);
a) 1 1
b) 0 0
c) 1 0
d) Compilation error<\/p>\n\n\n\n

Answer: a) 1 1<\/h4>\n\n\n\n

40) Which of the following is the correct syntax to declare a function that takes a variable number of arguments in C++?<\/h3>\n\n\n\n

a) void foo(\u2026);
b) void foo(int \u2026);
c) void foo(int, \u2026);
d) Both b and c<\/p>\n\n\n\n

Answer: d) Both b and c<\/h4>\n\n\n\n

41) What is the output of the following code?<\/h3>\n\n\n\n

include<\/h1>\n\n\n\n

int foo(int x) { return x * x; }
int main() {
int arr[] = {1, 2, 3, 4, 5};
std::transform(arr, arr + 5, arr, foo);
for (int i : arr) {
std::cout << i << ” “;
}
}
a) 1 4 9 16 25
b) 1 2 3 4 5
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: a) 1 4 9 16 25<\/h4>\n\n\n\n

42) Which of the following is a correct way to declare a constant reference in C++?<\/h3>\n\n\n\n

a) const int & ref = x;
b) int const & ref = x;
c) Both a and b
d) None of the above<\/p>\n\n\n\n

Answer: c) Both a and b<\/h4>\n\n\n\n

43) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 20;
swap(a, b);
std::cout << a << ” ” << b;
a) 10 20
b) 20 10
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: b) 20 10<\/h4>\n\n\n\n

44) Which of the following is the correct syntax for a move constructor in C++?<\/h3>\n\n\n\n

a) MyClass(MyClass &&obj) { }
b) MyClass(MyClass obj &&) { }
c) MyClass(MyClass const &&obj) { }
d) Both a and c<\/p>\n\n\n\n

Answer: a) MyClass(MyClass &&obj) { }<\/h4>\n\n\n\n

45) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 20;
int *ptr1 = &a, *ptr2 = &b;
std::swap(ptr1, ptr2);
std::cout << *ptr1 << ” ” << *ptr2;
a) 10 20
b) 20 10
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: b) 20 10<\/h4>\n\n\n\n

46) Which of the following is the correct syntax to call a virtual function in C++?<\/h3>\n\n\n\n

a) obj.foo();
b) MyClass::foo();
c) virtual obj.foo();
d) None of the above<\/p>\n\n\n\n

Answer: a) obj.foo();<\/h4>\n\n\n\n

47) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 20;
int *ptr1 = &a, *ptr2 = &b;
ptr2 = ptr1;
*ptr2 = 30;
std::cout << a << ” ” << b;
a) 10 20
b) 30 20
c) Compilation error
d) Runtime error<\/p>\n\n\n\n

Answer: b) 30 20<\/h4>\n\n\n\n

48) Which of the following is a correct way to declare a static member in C++?<\/h3>\n\n\n\n

a) class MyClass { public: static int x; };
b) class MyClass { static int x; public: };
c) class MyClass { static int x(); };
d) Both a and b<\/p>\n\n\n\n

Answer: a) class MyClass { public: static int x; };<\/h4>\n\n\n\n

49) What is the output of the following code?<\/h3>\n\n\n\n

int a = 10, b = 2;
double c = static_cast>(a) \/ b;
std::cout << c;
a) 5.0
b) 5
c) 5.00
d) Compilation error<\/p>\n\n\n\n

Answer: c) 5.00<\/h4>\n\n\n\n

50) What is a virtual destructor in C++?<\/h3>\n\n\n\n

a) It is a function that is called manually to destroy an object.
b) It is a function that is used to initialize an object.
c) It is a function that is called automatically when an object is destroyed.
d) It is a function that is used to create an object.<\/p>\n\n\n\n

Answer: c) It is a function that is called automatically when an object is destroyed.<\/h4>\n","protected":false},"excerpt":{"rendered":"

1) What is the size of a character in C++? a) 8 bitsb) 16 bitsc) 32 bitsd) 64 bits Answer: […]<\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10096","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nTop 50 C++ Interview Questions with Answers - scmGalaxy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-c-interview-questions-with-answers-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 50 C++ Interview Questions with Answers - scmGalaxy\" \/>\n<meta property=\"og:description\" content=\"1) What is the size of a character in C++? a) 8 bitsb) 16 bitsc) 32 bitsd) 64 bits Answer: […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-c-interview-questions-with-answers-2\/\" \/>\n<meta property=\"og:site_name\" content=\"scmGalaxy\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/profile.php?id=100003935402658\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-01T06:19:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-19T13:30:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-1.png\" \/>\n<meta name=\"author\" content=\"Ashwani Kumar\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ashwani Kumar\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/top-50-c-interview-questions-with-answers-2\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/top-50-c-interview-questions-with-answers-2\\\/\"},\"author\":{\"name\":\"Ashwani Kumar\",\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/#\\\/schema\\\/person\\\/19f28f8f969c1679bfb37d4dad6adc31\"},\"headline\":\"Top 50 C++ Interview Questions with Answers\",\"datePublished\":\"2023-05-01T06:19:50+00:00\",\"dateModified\":\"2023-06-19T13:30:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/top-50-c-interview-questions-with-answers-2\\\/\"},\"wordCount\":2063,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/top-50-c-interview-questions-with-answers-2\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/wp-content\\\/uploads\\\/2023\\\/05\\\/image-1.png\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/top-50-c-interview-questions-with-answers-2\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/top-50-c-interview-questions-with-answers-2\\\/\",\"url\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/top-50-c-interview-questions-with-answers-2\\\/\",\"name\":\"Top 50 C++ Interview Questions with Answers - 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