Programming in C++: Programming Test-2

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1 Programming in C++: Programming Test-2 Total Marks : 20 Partha Pratim Das Department of Computer Science and Engineering Indian Institute of Technology Kharagpur partha.p.das@gmail.com April 20, 2017 Question 1 This program is about the implementation of Pre/Post Incrementer. Fill in the blanks by keeping this in mind so that the given test cases will satisfy. Marks 2 class MyClass { int data; { // Define Constructor MyClass& operator++() { ++data; return ; { MyClass t(data); ++data; return ; void disp() { cout << " " << data ; ; int main() { int x; cin >> x; MyClass obj1(x); obj1.disp(); MyClass obj2 = obj1++; obj2.disp(); obj2 = ++obj1; obj2.disp(); 1

2 Public test case Public test case Private test case Solution: MyClass(int d): data(d) // *this // MyClass operator++(int) // t // 2

3 Question 2 Consider the code given below and fill in the blanks in the headers of the functions to match the output for the given input. Marks 2 class Shape { protected: float l; void getdata(){ cin >> l; ; float calculatearea(){ return l*l; class Circle : public Shape { float calculatearea(){ return 3.14*l*l; ; int main() { Shape * b; //Base class pointer //Derived class object Circle d; b = &d; b->getdata(); cout << b->calculatearea(); Public Test case Public Test case Private Test case Answer: virtual 3

4 Question 3 Consider the following code. Fill up the blank as per the given instruction Marks: 2 class Shape { protected: int width, height; Shape(int a = 0, int b = 0) { width = a; height = b; // Fill the blank with appropriate content or delete the blank void area() { cout << "Parent class area :" << endl; ; class Rectangle : public Shape { Rectangle(int a = 0, int b = 0) :Shape(a, b) { void area() { cout << (width * height) << " "; ; class Triangle : public Shape{ Triangle(int a = 0, int b = 0) :Shape(a, b) { void area() { cout << (width * height / 2); ; int main() { int a, b; cin >> a; cin >> b; Shape *shape; Rectangle rec(a, b); Triangle tri(a, b); // Write the code to call rectangle area. shape->area(); // Write the code to call triangle area. shape->area(); 4

5 Public Public Private Answer: virtual shape = &rec; shape = &tri; 5

6 Question 4 Consider the following program and fill in the blanks with appropriate casting. Marks: 2 class student { private: int roll; student(int r) :roll(r) { void fun() const { ( (this))->roll = 5; ; int getroll() { return roll; int main(void) { int old_roll_no = 0; cin >> old_roll_no; student s(old_roll_no); cout << s.getroll() << " "; s.fun(); cout << s.getroll() ; Public Public Private Answer: (const_cast <student*>(this))->roll = 5; 6

7 Question 5 In the following Program fill in the blanks as per the given instruction Marks: 2 #include<iostream> #include<string> template<typename T> void Swap(, ) // Fill in the parameters { ; // Body of the function int main() { int a, b; double s, t; string mr, ms; cin >> a >> b >> s >> t ; cin >> mr >> ms ; Swap(a, b); Swap(s, t); swap(mr, ms); cout << a << " " << b << " "; cout << s << " " << t << " "; cout << mr << " " << ms ; Public 1 I/P: ppd tm O/P: tm ppd Public 2 I/P: kolkata delhi O/P: delhi kolkata Private I/P: sm ppm O/P: ppm sm Answer template<typename T> void Swap(T& x, T& y) { T tmp = x; x = y; y = tmp; 7

8 8

9 Question 6 Write the required constructor and function definitions of the class Stack to get the output as per the test cases. Marks 2 class Sample { int data_, graph_; char data_or_graph_; Sample( ): { cout << data_ << " " << data_or_graph_<< " " << graph_ <<" "<< endl; ; int main() { int x; char y; cin>>x >> y ; Sample s1(x, y), s2(--x, ++y), s3; Public Test case-1 4 D 4 D 6 3 E 6 5 B 6 Public Test case-2 2 c 2 c 6 1 d 6 5 B 6 private Test case-1 5 B 5 B 6 4 C 6 5 B 6 solution int x = 5, char z = B, int y = 6 // data (x), data or graph (z), graph (y) 9

10 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 class M { protected: int m; M(): m(0) { void set_m(int x) { m = x; ; ; class N { private: int n; N(): n(0) { void set_n(int y) { n = y; ; int get_n() { return n ; ; class P : public M, public N { void display() { cout << << endl; ; ; int main() { int a, b; cin >> a >> b; P p; p.set_m(a); p.set_n(b); p.display(); 10

11 Public Public Private Solution m + get_n() 11

12 Question 8 Consider the code given below. Suitably edit the marked line in the code to match the test cases. Marks: 2 class B { B() { cout << "5" << " "; ~B() { cout << "4"; // Line to Edit: Do not Edit the "cout" ; class D : public B { int n; D(int p):n(p) { cout << n << " " ; ~D() { cout << ++n << " "; ; int main() { int n ; cin >> n ; B *baseptr = new D(n); delete baseptr; Public Public Private

13 Solution virtual 13

14 Question 9 Consider the code given below. Complete the above code by Filling the blank to get the required output. Marks: 2 template <class T> T func(t n1, T n2) { // write code here int main() { int i1, i2; double d1, d2; cin >> i1 >> i2 ; cin >> d1 >> d2 ; cout << func(i1, i2) << endl; // DO NOT EDIT THIS LINE cout << func(d1, d2) ; // DO NOT EDIT THIS LINE Public Public Private

15 Solution return (n1 < n2)? n1 : n2; 15

16 Question 10 Consider the code given below. Marks: 2 Complete the code to match the output of the test cases. // Write the code here for the inline function SQUARE int main() { int a, b, c; cin >> a; b = SQUARE(a); cout << b << endl; c = SQUARE(++a); cout << c << endl; Public Public Private Solution inline int SQUARE(int x) { return x * x; 16

Programming in C++: Assignment Week 8

Programming in C++: Assignment Week 8 Total Marks : 20 Partha Pratim Das Department of Computer Science and Engineering Indian Institute of Technology Kharagpur 721302 partha.p.das@gmail.com April 12,