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Programming in Modern C++ NPTEL Assignment Week 4 Answers
Q1. Consider the following code segment.
#include<iostream>
using namespace std;
class myClass{
static int s;
public:
myClass (ints): s(s) { }
void incr(){ s = s+10; }
void print(){ cout << s; }
};
int myClass::s = 10;
int main(){
myClass 01(5), 02(10);
01.incr();02. incr();
02.print();
return 0;
}What will be the output/error?
a. 15
b. 20
c. 30
d. Compilation Error: myClass::s is a static data member; it can only be initialized at its definition
Answer: d. Compilation Error: myClass::s is a static data member; it can only be initialized at its definition
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Q2. Consider the following code segment.
#include<iostream>
using namespace std;
class Point{
int x, y;
public:
Point (int r=0, int i=0): x(r), y(i) {}
Point& operator<< (const Point& c){ //Line-1
cout << x+c.x << "," << y+c.y << endl;
return *this;
}
friend Point& operator<<(ostream& os, Point& c);
};
Point& operator<<(ostream& os, Point& c) { //Line-2 cout << c.x <<<","<<< c.y << endl;
return c;
}
int main(){
Point c1 (2,5), c2(4,6);
cout << c1 <<< c2;
return 0;
}What will be the output?
a. 2,5
4,6
b. 6,5
2, 11
c. 6, 11
2,5
d. 2,5
6,5
Answer: Option D
Q3. Consider the following code segment.
#include <iostream>
using namespace std;
int var= 0;
namespace name {
int var= 2;
}
int main() {
int var= 1;
{
using namespace name;
cout << ::var << " " << var << " " << name::var; // LINE-1}
return 0;
}What will be the output/error?
a. 0 1 2
b. 0 2 2
c. 2 0 1
d. Compilation Error: reference to ‘var’ is ambiguous
Answer: a. 0 1 2
Q4. Consider the following code segment.
#include <iostream>
using namespace std;
class myClass {
static int X;
static int Y;
public:
_______ void print() { //LINE-1
cout << x << " " << Y;
}
void setX(int a){
X=a;
}
void setY(int a){
Y=a;
}
};
int myClass::X = 10;
int myClass::Y = 10;
int main() {
myClass t1, t2;
t1.setX(4);
t2.setY (5);
myClass::print();
return 0;
}Fill in the blank at LINE-1 such that the output will be 4 5.
a. mutable
b. static
c. const
d. friend
Answer: b. static
Q5. Consider the following code segment.
#include<iostream>
using namespace std;
int x=10;
namespace e{
namespace e1{
int x=15;
}
int x=5;
}
int main(){
________________; //LINE-1
cout << x;
return 0;
}Fill in the blank at LINE-1 such that the program will print 15.
a. using e::e1::x
b. using e::e1
c. using namespace e::e1
d. using namespace e
Answer: a. using e::e1::x
Q6. Consider the following code segment.
#include<iostream>
using namespace std;
class constTest{
______________x; //LINE-1
public:
constTest(int x) = x(x) {}
void set (int a) const{
x = a;
}
void print() const{
cout << x <<< endl;
}
};
int main(){
const constTest m(5);
m.set(10);
m.print();
return 0;
}Fill in the blank at LINE-1 such that the output is 10.
a. int mutable
b. mutable int
c. volatile int
d. const int
Answer: a. int mutable
Q7. Consider the following code segment.
#include<iostream>
using namespace std;
namespace name{
class Student{
int roll;
public:
Student (int x): roll(x) {}
void print(){ cout << roll; }
};
}
int main(){
_______________; //LINE-1
s.print();
return 0;
}Fill in the blank at LINE-1 such that the output is 5.
a. name::Student s(5)
b. Student s(5)
c. name. Student s(5)
d. using name::Student s(5)
Answer: a. name::Student s(5)
Q8. Consider the following code segment.
#include<iostream>
using namespace std;
class Point{
int x, y;
public:
Point (int x, int y) x(x), y(y) {}
__________________; //LINE-1
};
Point& operator<< (ostream& os, Point& p){
cout<<"("<<< p.x << "," << p.y << ")" << endl;
return p;
}
int main(){
Point pt (2,5);
cout << pt;
return 0;
}Fill in the blank at LINE-1 such that the program will print (2,5).
a. Point& operator<<< (ostream&, Point&)
b. friend Point& operator<< (ostream&, Point&)
c. Point& friend operator<<< (ostream&, Point&)
d. const Point& operator<< (ostream&, Point&)
Answer: b. friend Point& operator<< (ostream&, Point&)
Q9. Consider the following code segment.
#include<iostream>
using namespace std;
class A{
static int a;
public:
int get(){ return a; }
_________________; //LINE-1
};
int A::a = 0;
class B{
int b;
public:
B(int y) b(y) {}
void print(){
A::a = 10;
cout << A::a-b << " " << A::a+b;
}
};
int main(){
B t2(5);
t2.print();
return 0;
}Fill in the blank at LINE-1 such that the program will print 5 15.
a. static class B
b. friend class B
c. class friend B
d. using class B
Answer: b. friend class B
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