Assess Your C++ Skills

Answer question #9706 Variadic templates in C++11 allow the programmer to write functions that: 1. Take an arbitrary number of arguments in a type-safe way. 2. Have all the argument handling logic resolved at run-time 3. Allow a variety of return types. 4. Allow custom data structures other than tuples.

Answer question #9711 What is the value of z after executing the following code snippet? unsigned int x = 3; unsigned int y = 5; unsigned int z = x | y;

Answer question #9716 Given the following code: const int* ptr; Which of the following can be changed?

Answer question #9721 If you wanted to go through all elements of a vector v in reverse order, what for loop would you write? 1. for (auto it = rbegin(v); it != rend(v); it++) 2. for (auto it = rbegin(v); it != rend(v); it--) 3. for (auto it = end(v); it != begin(v); it--) 4. Reverse the vector then go through as usual

Answer question #9726 In a container such as an std::vector, the iterator returned by a call to end() points to: 1. The last element in the container. 2. The end() function cannot be applied to a std::vector. 3. The element after the last element in the container. 4. The element before the last element in the container.

Answer question #9731 If you write past the end of a locally-allocated C style array, what happens? 1. Nothing when you do it; possible strange errors later 2. An exception is thrown 3. The array is invalidated 4. The information is lost but nothing else is affected

Answer question #9736 What is the output of the following code snippet? int a = 1; unsigned b = -1; if(a > b) cout << "a is greater than b"; else cout << "a is not greater than b";

Answer question #9741 What is the output of the following C++ program ? #include using namespace std; class SomeClass { public: static int id; SomeClass() { id ++; } static int getID() { return id; } }; int SomeClass::id = 0; void main() { cout << SomeClass::getID() << ","; SomeClass id1, id2, ids[2]; cout << SomeClass::getID(); }

Answer question #9746 When you use the new operator to create an object on the free store, it returns: 1. a pointer to the object that was created. 2. true or false according to whether creation succeeded or failed. 3. the actual object that was created. 4. a smart pointer to the object that was created. 5. a reference to the object that was created.

Random fact about C++ 💡 💡FUN FACT 💡As of 2019, C++ remains the third most popular programming language, behind Java and C.

Answer question #9752 C++ keywords, punctuation, and other language rules can be changed by: 1. Nobody, C++ keywords and rules cannot change 2. Any C++ compiler vendor 3. The ISO C++ committee 4. Bjarne Stroustrup, who invented C++

Answer question #9757 What is the output of the following code involving enums? enum words { four, score, and, seven, years, ago }; cout << seven << endl;

Answer question #9762 Which exception and type is caught in the following try/catch block? try { string s1("abc"); string s2("def"); s1.append(s2, 4, 3); cout << s1 << endl; } catch (exception &e) { cerr << "Exception: " << e.what() << endl; cerr << "Type: " << typeid(e).name() << endl; }; 1. runtime exception, class std::runtime_error 2. vector too long, class std::length_error 3. invalid string position, class std::out_of_range 4. No exception occurs

Answer question #9767 Some developers prefer to use '\n' rather than std::endl for performance reasons. Which of these statements is true when sending output to a file? 1. Both approaches flush the output and there is no performance difference 2. You cannot use std::endl when writing to a file 3. '\n' is slower, because there is no flush 4. - std::endl is slower, because of the flush

Answer question #9772 Given this code: int* const ptr; Which of the following can be changed?

Answer question #9777 Which of these is a difference between a struct and class? 1. A class implements validation and business logic; a struct cannot 2. The default access is public in a struct; private in a class 3. A class can have a constructor; a struct cannot 4. A class can have functions; a struct cannot

Answer question #9782 Which is true of specifying private, protected, and public in a class declaration? 1. The order is irrelevant, but each term can only be used once 2. They can be used anywhere, as many times as desired, and in any order 3. The order must be: private, protected, then public 4. The order must be: public, protected, then private

Answer question #9787 To find a character in a std::string, what do you use ?

Answer question #9792 If you use multiple overloads of a function instead of default parameters, what bad thing might happen? 1. Exceptions will not work properly 2. Code that calls the function is more likely to have a compiler error 3. Your code will run more slowly 4. A developer has to read the .cpp file to understand the differences among the overloads