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Programming in Modern C++ NPTEL Assignment Week 3 Answers
Q1. Consider the following code segment.
class Complex{
private:
int re, im;
public:
void setRE(int r){ re=r_; }
void setIM(int i_){ im = i_; }
void print(){ cout << re <<< ", i" << im; }
void incr(){ re++, im++; }
int incrRE(){ return re + 1; }
int incrIM(){ return ++im; }
};Identify set of all methods that change the state of Complex class objects?
a. setRE(), setIM(), print()
b. setRE(), setIM(), incrRE(), incrIM()
c. incr(), incrRE(), incrIM()
d. setRE(), setIM(), incr(), incrIM()
Answer: d. setRE(), setIM(), incr(), incrIM()
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Q2. Consider the following code segment.
#include <iostream>
using namespace std;
class Number {
int n;
public:Number () {
cout << 0 <<< " ";
}
Number(int i): n(i) {
cout << n << " ";
}
};
int main() {
int i = 1;
Number n1(); //LINE-1
Number *n2 = new
Number (i++);
Number *n3;
new Number (i++);
return 0;
}What will be the output?
a. 0 1 0 2
b. 0 1 2
c. 0 2 3
d. 1 2
Answer: d. 1 2
Q3. Consider the following code segment.
#include <iostream>
#include <cstring>
using namespace std;
class MyClass {
const char ----------; // LINE-1: declare the data members
public:
MyClass (const char* s1, const char* s2, const char* _s3) :
s1 (setS1 (s1)), s2 (setS2 (s2)),
s3(setS3(_s3)){}
const char* setS1 (const char* s) {
cout << s <<< " ";
return strdup(s);
}
const char* setS2 (const char* s) {
cout << s <<< " ";
return strdup(s);
}
const char* setS3 (const char* s) {
cout << s <<< " ";
return strdup(s);
}
};
int main() {
MyClass obj("programming", "in", "C++");
return 0;
}Fill in the blank at LINE-1 such that the program will print in C++ programming?
a. *s2, *s3, *s1
b. *s1, *s2, *s3
c. *s1, *s3, *s2
d. *s2, *s1, *s3
Answer: a. *s2, *s3, *s1
Q4. Consider the following code segment.
#include <iostream>
#include <string>
using namespace std;
class Test{
int t;
public:
int set t(int t) const {
_t = t;
}
int get_t() const {
return _t;
}
};
int main(){
Test obj;
obj.set_t (5);
cout<<obj.get_t();
return 0;
}What will be the output/error?
a. 0
b. 5
c. Compiler error: assignment of data-member Test::_t is read-only object
d. Compiler error: cannot have const function for non-const object
Answer: c. Compiler error: assignment of data-member Test::_t is read-only object
Q5. Consider the following code segment.
#include <iostream>
using namespace std;
class Complex {
int re, im;
public:
Complex(int re, int im): re(_re), im(_im) { }
void change (Complex *new_C) { this = new_C; }
void show() { cout << re << " + i" << im <<< endl;
}
};
int main() {
Complex c1 (10, 20);
Complex c2(20, 50);
c1.change(&c2);
c1.show();
return 0;
}What will be the output/error?
a. 10 + i20
b. 20 + i50
c. Compiler Error: lvalue required as left operand of assignment
d. Compiler Error: private x, y are inaccessible
Answer: c. Compiler Error: lvalue required as left operand of assignment
Q6. Consider the following code segment.
class myClass {
// code...
};
int main() {
const myClass m; // LINE-1
return 0;
}What is the type of this pointer associated with the object m?
a. const myClass* this;
b. myClass* const this;
c. myClass const* const this;
d. const myClass* const this;
Answer: c. myClass const* const this;
d. const myClass* const this;
Q7. Consider the following code segment.
#include<iostream>
using namespace std;
class Data {
public:
Data() { cout << "0"; } //LINE-1Data
(Data *t) { cout << "K"; } //LINE-2
Data(const Data &t) { cout << "Z"; } //LINE-3};
int main() {
Data *t1, t2;
t1= new Data();
t2 = new Data(t1);
Data t3 = *t1;
Data t4 = t3;
return 0;
}What will be the output?
a. OKKK
b. OKZZ
c. OKKZ
d. OZZZ
Answer: b. OKZZ
Q8. Consider the following code segment.
#include<iostream>
using namespace std;
class String {
char x;
public:
String (char x): x(x) { }
void display() { cout << _______<< " "; } //LINE-1
};
int main() {
String c('C');
c.display();
return 0;
}Fill in the blank at LINE-1 such that the program will print D.
a. ++this->x
b. ++this.x
c. ++x
d. x++
Answer: a. ++this->x
c. ++x
Q9. Consider the following code segment.
#include<iostream>
using namespace std;
static int i = 5;
class myClass {
public:
myClass() { cout <<< ++; }
myClass() { cout << i--; }
};
void check (myClass c){
//Some Code}
int main() {
myClass c1;
check (c1);
return 0;}What will be the output?
a. 5665
b. 555
c. 665
d. 6565
Answer: c. 665
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