Programming in C++: Programming Test-1

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1 Programming in C++: Programming Test-1 Total Marks : 20 Partha Pratim Das Department of Computer Science and Engineering Indian Institute of Technology Kharagpur partha.p.das@gmail.com April 18, 2017 Question 1 Here display() is a non member function which should display the data member of Myclass. Apply the proper concept to fill the blank so that the given test cases will pass. Marks 2 #include<iostream> class MyClass { int x_; MyClass(int i) : x_(i) { ; // Declare the display function. ; void display( ) { cout << " " << a.x_; int main(){ int x; cin >> x; MyClass obj(x); display(obj); Public test case-1 4 Output: 4 Public test case-2 8 Output: 8 1

2 Private test case-1 0 Output: 0 Solution: friend void display(const MyClass &a); // const MyClass &a 2

3 Question 2 Fill in the blanks below. The name of the parameter of the constructor should be nc. Marks 2 #include <iostream> class Engine { Engine(int nc) :cylinder(nc){ void start() { cout << getcylinder() << " cylinder engine started" ; ; int getcylinder() { return cylinder; private: int cylinder; ; class Car : private Engine { // Car has-a Engine // Define the constructor. Name of the parameter should be nc void start() { cout << "car with " << Engine::getCylinder() << " cylinder engine started" << endl; ; // Call the start function of Engine int main() { int cylin; cin >> cylin; Car c(cylin); c.start(); Public Test case-1 8 Output: car with 8 cylinder engine started 8 cylinder engine started 3

4 Public Test case-2 10 Output: car with 10 cylinder engine started 10 cylinder engine started Private Test case-1 4 Output: car with 4 cylinder engine started 4 cylinder engine started Solution Car(int nc) : Engine(nc) { Engine::start(); 4

5 Question 3 Consider the following code. Fill up the code in editable section to congratulate the Manager and the Clerk, so that outputs for the test cases will match. Marks: 2 #include <iostream> #include <string> class Employee { string Name; double salary; Employee(string fname, double sal) : Name(fName), salary(sal) { void show() { cout << Name << " " << salary; void addbonus(double bonus) { salary += bonus; ; class Manager :public Employee { Manager(string fname, double sal) : Employee(fName, sal) { ; class Clerk :public Employee { Clerk(string fname, double sal) : Employee(fName, sal) { ; void congratulate(employee* emp) { emp->addbonus(200); emp->show(); cout << " "; ; int main() { Employee* emp; int sal_m, sal_c; cin >> sal_c >> sal_m; Manager m1("steve", sal_m); Clerk c1("kevin", sal_c); // Call the proper function/s to congratulate the Manager and the Clerk Public Test case-1 5

6 Output: Kevin 2200 Steve 1200 Public Test case Output: Kevin 4200 Steve 1200 Private Test case Output: Kevin 6400 Steve 2700 Solution congratulate(&c1); congratulate(&m1); 6

7 Question 4 Fill in the blanks with appropriate casting. Marks: 2 #include <iostream> class Base { virtual void DoIt() = 0; virtual ~Base() {; ; // pure virtual class Foo : public Base { virtual void DoIt() { cout << "12,"; ; void FooIt() { cout << "13,"; ; class Bar : public Base { virtual void DoIt() { cout << "14,"; void BarIt() { cout << "15:"; ; Base* CreateRandom(int x) { if ((x % 2) == 0) return new Foo; else return new Bar; int main() { int lim = 0; cin >> lim; for (int n = 0; n < lim; ++n) { Base* base = CreateRandom(n); base->doit(); Bar* bar = (base); Foo* foo = (base); if (bar) bar->barit(); if (foo) foo->fooit(); Public Test case-1 1 Output: 12,13, 7

8 Public Test case-2 2 Output: 12,13,14,15: Public Test case-3 3 Output: 12,13,14,15:12,13, Private Test case 4 Output: 12,13,14,15:12,13,14,15: Solution Bar* bar = dynamic_cast<bar*>(base); Foo* foo = dynamic_cast<foo*>(base); 8

9 Question 5 Modify the code in editable section to match the public test cases. Marks: 2 #include <iostream> #include <vector> class Test { static int count; int id; Test(int id) { count++; cout << count << ; if (count == id) throw id; ~Test() { ; int Test::count = 0; int main() { int n, m = 0; cin >> n >> m; // Using STL vector, declare testarray try { for (int i = 0; i < n; ++i) { testarray.push_back(test(m)); // Write the catch clause { cout << "Caught " << i << endl; Public Test case Output: Caught 5 Public Test case

10 Output: Caught 6 Private Test case 3 3 Output: Caught 3 Solution vector<test> testarray; catch (int i) 10

11 Question 6 Fill up the blanks to get the desired output according to the test cases in the perspective of dynamic memory allocation and de-allocation. Marks 2 #include <iostream> int main(){ int d; // Declare variable p and use operator new to // allocate memory to it cin >> d ; *p = d ; cout << ++*p + d++; delete( ); // Release the memory allocated above Public Test case-1-7 Output: -13 Public Test case-2 11 Output: 23 private Test case-1 15 Output: 31 solution int *p = (int *)operator new(sizeof(int)); // operator // p 11

12 Question 7 Consider the code given below. Fill up the marked lines to complete the code to match the output of the test cases. Marks: 2 Public #include<iostream> class MyClass { static int count; ; MyClass(){ count++; ~MyClass() { // Write the destructor int MyClass::count = 1; int main() { cin >> MyClass::count; MyClass *pt; pt = new MyClass[2]; delete[] pt; Public-1 20 Output: 21,20, Public-2 2 Output: 3,2, Private 42 Output: 41,42, Solution count--; cout << MyClass::count << ","; 12

13 Question 8 Consider the code given below. Fill up the marked lines to complete the code to match the output of the test cases. Marks: 2 #include <iostream> #include <stdexcept> // Array out of Bounds inline int arraybound(int total, int bounds) { if (bounds > 40) ("Array Out of Bounds"); // throw exception here return total * bounds; int main(void) { int i = 0, total, bound; cin >> total >> bound; try { i = arraybound(total, bound); std::cout << i ; catch (std::overflow_error& e){ // catch the exception here std::cout << e.what() ; // Print the exception Public Output: Array Out of Bounds Public Output: 50 Private Output: Array Out of Bounds 13

14 Solution throw std::overflow_error("array Out of Bounds") 14

15 Question 9 Consider the code given below. Fill up the marked lines to complete the code to match the output of the test cases. Marks: 2 #include <iostream> class Area { int area; int calc(int l, int b) { area = 4 *l*b; return area; ; class Perimeter { int peri; int calc(int l, int b) {peri = 8 * (l + b); return peri; ; /* Rectangle class is derived from classes Area and Perimeter. */ class Rectangle: public Area, public Perimeter { // Inherit the required base classes private: int length, breadth; int area() { /* Calls area_calc() of class Area and returns it. */ ; int peri() { /* Calls peri_calc() function of class Perimeter and returns it. */ ; Rectangle(int l, int b) : length(l), breadth(b) { int print() { cout << area() << " " << peri(); ; int main() { int l, b; cin >> l >> b; Rectangle r(l, b); r.print(); 15

16 Public Output: Public Output: Private Output: 8 24 Solution return Area::calc(length, breadth) return Perimeter::calc(length, breadth) 16

17 Question 10 Consider the code given below. Fill up the marked lines to complete the code to match the output of the test cases. Marks: 2 #include <iostream> class A { int n; protected: A(int i) : n(i) { virtual void print() = 0; virtual int get(){ return n; ; class B : private A { B(int i) : A(i) { ; int get() { ; // The get function body class C : public B { C(int i) : B(i) { void print() { cout << ; << endl; // display the result of the get function int main(){ int n; cin >> n; C *p = new C(n); p->print(); 17

18 Public 1 9 Output: 9 Public 2 0 Output: 0 Private 1 1 Output: 1 Solution return A::get() get() 18

Programming in C++: Assignment Week 6

Programming in C++: Assignment Week 6 Total Marks : 20 Partha Pratim Das Department of Computer Science and Engineering Indian Institute of Technology Kharagpur 721302 partha.p.das@gmail.com April 6, 2017