NPTEL PROGRAMMING IN C++ ASSIGNMENT WEEK 4 ANSWERS 2020(JUL-DEC)

 Question 1 :

#include <iostream>

using namespace std;

class B;             // LINE-1

class A {

    int a_ = 0;

public:

    A(int x) : a_(x) { }

    int addB(B&);

    int subtractB(B&);

};

class B {

    int b_ = 5;

public:

    friend class A;         // LINE-2

};

Question 2:

Complex operator *(const Complex &c) { // LINE-1

        int x, y;

        x = re*(c.re) - im*(c.im);            // LINE-2

        y = im*(c.re) + (c.im)*re;            // LINE-3

        Complex t1(x, y);

        return t1;

    }

Question 3:

        if(data == m1.data) m.data = 1;    // LINE-1

            return m;

    }

};

void fun(myClass m) { // LINE-2

Question 4:

#include <iostream>

using namespace std;

class myClass {

    int data;

    static myClass *t;        // LINE-1 Complete the declaration

    myClass(int x) : data(x) { }

public:

    static myClass *create(int x) {    // LINE-2 Mention return type of the function

        if (!t)

            t = new myClass(x);       // LINE-3 Allocate memory towards object t

            return t;

    }