NPTEL Programming in Modern C++ | Week 4 : Programming Assignments 1 2 AND 3 | Jan-2022 | NPTEL | Swayam

netaji gandi Tuesday, February 22, 2022
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Week 4 : Programming Assignment 1

Due on 2022-02-24, 23:59 IST
Consider the following program. Fill in the blanks as per the instructions given below:
  • at LINE-1 with appropriate declaration so that global operator function can access private data of class Complex,
  • at LINE-2 with appropriate operator function header,
  • at LINE-3 with appropriate return statement,
such that it will satisfy the given test cases. 


Select the Language for this assignment. 
1
#include<iostream>
2
#include<cstring>
3
using namespace std;
4
​
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class Complex{
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    int re, im;
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public:
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    Complex(int r, int i) : re(r), im(i){}
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    void print(){
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        cout << re << " + j" << im;
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    }
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    friend Complex operator+(const Complex &e, int n);      //LINE-1
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};
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​
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Complex operator+(const Complex &e, int n){            //LINE-2
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    return Complex(e.re+n,e.im);               //LINE-3
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}
0
int main(){
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    int n;
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    cin >> n;
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    Complex c(3, 4);
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    Complex c1 = c + n;
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    c1.print();
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    return 0;
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}

 
 
Public Test CasesInputExpected OutputActual OutputStatus
Test Case 1
5
8 + j4
8 + j4
Passed
Test Case 2
10
13 + j4
13 + j4
Passed

Private Test cases used for EvaluationStatus
Test Case 1
Passed





Week 4 : Programming Assignment 2

Due on 2022-02-24, 23:59 IST
Consider the following program. Fill in the blanks as per the instructions given below:
  • at LINE-1 with appropriate keyword to declare the Database pointer variable,
  • at LINE-2 to complete the header for function getInstance(int i),
  • at LINE-3 with appropriate keyword to complete ins variable initialization
such that it will satisfy the given test cases. 

Select the Language for this assignment. 
1
#include<iostream>
2
using namespace std;
3
​
4
class Database{
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    int data;
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    static Database *ins;                    //LINE-1
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    Database(int i) : data(i) {}
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public:
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    int get(){ return data; }
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    static Database* getInstance(int i){        //LINE-2
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        if(!ins)
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            ins = new Database(i);
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        return ins;
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    }
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};
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​
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Database* Database::ins = 0; // LINE-3
0
int main(){
1
    int n, i;
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    cin >> n;
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    int a[n];
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    for(i=1;i<=n;i++)
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        cin >> a[i];
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    for(i=1;i<=n;i++){
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        Database *ins = Database::getInstance(a[i]);
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        cout << ins->get() << " ";
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    }
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    return 0;
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}
 
 
Public Test CasesInputExpected OutputActual OutputStatus
Test Case 1
2
3 4
3 3 
3 3 
Passed
Test Case 2
3
2 4 6
2 2 2 
2 2 2 
Passed

Private Test cases used for EvaluationStatus
Test Case 1
Passed




Week 4 : Programming Assignment 3

Due on 2022-02-24, 23:59 IST

Consider the following program. Fill in the blanks as per the instructions given below:
  • at LINE-1 with appropriate statement so that global operator function can access private members,
  • at LINE-2 with appropriate operator function header,
  • at LINE-3 with appropriate operator function header,
  • at LINE-4 with appropriate operator function header
such that it will satisfy the given test cases.

Select the Language for this assignment. 
1
#include<iostream>
2
using namespace std;
3
​
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class Point{
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    int x;
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    int y;
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public:
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    Point(int _x, int _y) : x(_x), y(_y) {}
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    void print(){
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        cout << "(" << x << "," << y << ")";
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    }
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    friend istream& operator>>(istream& is, Point& p);      //LINE-1
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    Point& operator++(){                                //LINE-2
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        ++x;
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        return *this;
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    }
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    Point operator++(int){                              //LINE-3
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        Point p(x,y);
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        ++y;
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        return p;
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    }
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};  // End of class Point
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​
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​
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istream& operator>>(istream& is, Point& p){                //LINE-4
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    is >> p.x >> p.y;
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    return is;
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}
0
int main(){
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    int i, j;
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    cin >> i >> j;
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    Point p(i,j);
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    ++(++p);
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    p++;
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    p.print();
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    return 0;
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}

 
 
Public Test CasesInputExpected OutputActual OutputStatus
Test Case 1
3 4
(5,5)
(5,5)
Passed
Test Case 2
5 2
(7,3)
(7,3)
Passed

Private Test cases used for EvaluationStatus
Test Case 1
Passed

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