MCQ Exam Test

Q1

What is mersenne_twister_engine?

A Pseudo-random number engine that generates random unsigned integers
B Pseudo-random number engine that generates random unsigned integers in the range [0, 2w-1] for some w using Mersenne Twister algorithm
C Pseudo-random number engine that generates random unsigned integers in the range [0, 2w-1] for some w using lagged Fibonacci generator
D Pseudo-random number engine that generates random signed integers in the range [0, 2w-1] for some w using Mersenne Twister algorithm

Q2

Which is used to solve the memory management problem in c++?

A smart pointers
B arrays
C stack
D queue

Q3

Which operator is used to declare the destructor?

A #
B ~
C @
D $

Q4

What will be the output of the following C++ code? #include <stdio.h> #include <ctype.h> int main () { int i = 0; int cx = 0; char str[] = "Hello, welcome!"; while (str[i]) { if (ispunct(str[i])) cx++; i++; } printf ("%d\n", cx); return 0; }

A 1
B 2
C 3
D 4

Q5

Where exception are handled?

A inside the program
B outside the regular code
C both inside or outside
D main program

Q6

Which operator is used to access the first or second element of a pair?

A ->
B .
C *
D []

Q7

What will be the output of the following C++ code? #include<iostream> #include "math.h" using namespace std; double MySqrt(double d) { if (d < 0.0) throw "Cannot take sqrt of negative number"; return sqrt(d); } int main() { double d = 5; cout << MySqrt(d) << endl; }

A 5
B 2.236
C Error
D Cannot take sqrt of negative number

Q8

What will be the output of the following C++ code? #include <iostream> using namespace std; class class0 { public: virtual ~class0(){} protected: char p; public: char getChar(); }; class class1 : public class0 { public: void printChar(); }; void class1::printChar() { cout << "True" << endl; } int main() { class1 c; c.printChar(); return 1; }

A TRUE
B error
C no output
D runtime error

Q9

How the relationship is made in Association?

A Through the objects of classes
B Through constructor
C Through destructor
D Through class Names

Q10

Which of the following operators are overloaded for functors?

A []
B ()
C <<
D >>

Q11

What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstdlib> using namespace std; template<class T> class A { public: A(){ cout<<"Created\n"; } ~A(){ cout<<"Destroyed\n"; } }; int main(int argc, char const *argv[]) { A <int>a; return 0; }

A Created Destroyed
B Destroyed Created
C Compile-time error
D Run-time error

Q12

What is the main purpose of the constructor?

A Begin the execution of class
B Include the macros for the program
C Establish the class invariant
D Terminate the program

Q13

Choose the correct formatted code.

A int main(){ cout << "5";}
B int main() { cout << "5"; }
C int main() { cout << "5";}
D main() { cin>>5;

Q14

By seeing which operator thus this C++ program stops getting the input? #include <iostream> #include <fstream> using namespace std; int main () { char ch; streambuf * p; ofstream os ("test.txt"); pbuf = os.rdbuf(); do { ch = cin.get(); p -> sputc(ch); } while (ch != '.'); os.close(); return 0; }

A dot operator
B insertion operator
C $ symbol
D @ symbol

Q15

How many parameters are required for sort_heap function?

A 1
B 2
C 2 or 3
D 3

Q16

What will be the output of the following C++ code? #include <iostream> #include <string> #include <tuple> using namespace std; int main() { tuple <int, char, string> tp1; tp1 = make_tuple(6, 'a', "Hello"); int x; char y; string z; tie(x,y,z) = tp1; cout<<"x: "<<x<<"\ny: "<<y<<"\nz: "<<z<<endl; return 0; }

A Segmentation fault z: Hello
B x: 6 z: Hello y: a
C Error
D x: 6 y: a

Q17

What is the signature of math in function using command line arguments?

A int main(int argc, char const *argv[]);
B int main(int argc, char const **argv);
C int main(int argc, char **argv);
D all of the mentioned

Q18

What is any in C++?

A STL container used to store a single value of any type
B Exception class in C++
C Fundamental type provided by C++
D Template data type

Q19

What can go wrong in resource management on c++?

A Leakage
B Exhaustion
C Dangling
D Exception

Q20

Which of the following statements regarding absolute and concrete classes in C++ is correct?

A Absolute classes cannot have concrete subclasses
B Concrete classes cannot have abstract methods
C Absolute classes cannot have member variables
D Concrete classes cannot have constructors

Q21

Which value is placed in the base class?

A derived values
B default type values
C both default type & derived values
D null value

Q22

What will be the output of the following C++ code? #include<iostream> using namespace std; int main() { int x = 5; auto check = []() -> bool { if(x == 0) return false; else return true; }; cout<<check()<<endl; return 0; }

A 1
B 0
C Error
D Segmentation fault

Q23

What will be the output of the following C++ code? #include <vector> #include <algorithm> #include <iostream> using namespace std; int main() { vector<int> v; for(int i=0;i<10;i++) v.push_back(i+1); for(int i=0;i<10;i++) cout<<v[i]<<" "; cout<<endl; random_shuffle(v.begin(), v.end()); for(int i=0;i<10;i++) cout<<v[i]<<" "; return 0; }

A 1 2 3 4 5 6 7 8 9 10 5 4 8 9 1 6 3 2 7 10
B 5 4 8 9 1 6 3 2 7 10 1 2 3 4 5 6 7 8 9 10
C 1 2 3 4 5 67 8 9 10 1 2 3 4 5 6 7 8 9 10
D 5 4 8 9 1 6 3 2 7 10 5 4 8 9 1 6 3 2 7 10

Q24

What will be the output of the following C++ code? #include <iostream> #include <string> #include <tuple> using namespace std; int main() { tuple <int, char, string> tp; tp = make_tuple(4, '1', "Hello"); return 0; }

A Nothing is printed
B Compile-time error
C Run-time error
D Exception occurs

Q25

What are the Generators in C++?

A An object that generates uniformly distributed numbers
B An object that generates a number from a given sequence
C An object that generates the smallest number from a given range
D An object that generates unique numbers

cpp - Part 89

What is mersenne_twister_engine?

Which is used to solve the memory management problem in c++?

Which operator is used to declare the destructor?

What will be the output of the following C++ code? #include <stdio.h> #include <ctype.h> int main () { int i = 0; int cx = 0; char str[] = "Hello, welcome!"; while (str[i]) { if (ispunct(str[i])) cx++; i++; } printf ("%d\n", cx); return 0; }

Where exception are handled?

Which operator is used to access the first or second element of a pair?

What will be the output of the following C++ code? #include<iostream> #include "math.h" using namespace std; double MySqrt(double d) { if (d < 0.0) throw "Cannot take sqrt of negative number"; return sqrt(d); } int main() { double d = 5; cout << MySqrt(d) << endl; }

How the relationship is made in Association?

Which of the following operators are overloaded for functors?

What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstdlib> using namespace std; template<class T> class A { public: A(){ cout<<"Created\n"; } ~A(){ cout<<"Destroyed\n"; } }; int main(int argc, char const *argv[]) { A <int>a; return 0; }

What is the main purpose of the constructor?

Choose the correct formatted code.

By seeing which operator thus this C++ program stops getting the input? #include <iostream> #include <fstream> using namespace std; int main () { char ch; streambuf * p; ofstream os ("test.txt"); pbuf = os.rdbuf(); do { ch = cin.get(); p -> sputc(ch); } while (ch != '.'); os.close(); return 0; }

How many parameters are required for sort_heap function?

What is the signature of math in function using command line arguments?

What is any in C++?

What can go wrong in resource management on c++?

Which of the following statements regarding absolute and concrete classes in C++ is correct?

Which value is placed in the base class?

What will be the output of the following C++ code? #include<iostream> using namespace std; int main() { int x = 5; auto check = []() -> bool { if(x == 0) return false; else return true; }; cout<<check()<<endl; return 0; }

What will be the output of the following C++ code? #include <iostream> #include <string> #include <tuple> using namespace std; int main() { tuple <int, char, string> tp; tp = make_tuple(4, '1', "Hello"); return 0; }

What are the Generators in C++?

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