CPA – Programming Essentials in C++ Final Exam Answers

Priya Dogra October 11, 2022 Exam answers Leave a comment 22,001 Views

CPA – Programming Essentials in C++ Final Exam Answers

Question 1: What is the output of the following snippet?

#include <iostream>

using namespace std;

namespace OuterSpace

{

int x = 1;

int y = 2;

}

namespace InnerSpace

{

float x = 3.0;

float y = 4.0;

}

int main () {

{ using namespace InnerSpace;

cout << x << ” “;

}{

using namespace OuterSpace; using InnerSpace::y;

cout << y;

}

return 0;

}

3 2
Compilation error
3 1
3 4

Question 2: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class Uno {

public: ~Uno() { cout << “X”; }

};

void foo(Uno *d)

{

Uno e;

*d = e;

}

int main()

{

Uno *u = new Uno;

foo(u);

delete u;

return 0;

}

XXX
XXXX
XX
X

Question 3: Which code, inserted into class C, generates the output by? Choose all correct answers.

#include <iostream>

#include <string>

using namespace std;

class Uno {

protected: char y;

public: char z;

};

// insert code here

{

public:

void set() {

y = ‘a’; z = ‘z’;

}

void out() { cout << ++y << –z; }

};

int main () {

Due b;

b.set();

b.out();

return 0;

}

class Due : public Uno
class Due : private Uno
class Due
class Due : protected Uno

Question 4: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int cnt = 10;

do {

cnt–;

if (cnt % 3 == 2)

break;

cout << cnt;

}

while(cnt);

return 0;

}

109
9
987654321
10987654321

Question 5: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int i = 2;

float f = 1.4;

char c = ‘a’;

bool b = true;

c += i + f + b;

cout << c;

return 0;

}

Question 6: What is the output of the following snippet?

#include <iostream>

using namespace std;

class A

{

public: void out(){ cout << “A”; }

};

class B : public A

{

public: void out(){ cout << “B”; }

};

int main()

{

A *a;

a = new A();

a -> out();

a = new B();

a -> out();

return 0;

Question 7: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

struct Who

{

string nick;

};

class She

{

Who *who;

public:

She() {

who = new Who;

who -> nick = “Jane”;

}

string out (){

return who -> nick;

}

};

int main()

{

She they[2];

for(int i = 0; i < 2; i++)

cout << they[i].out();

return 0;

}

It prints nothing
Jane
Runtime error
JaneJane

Question 8: Which statement will you add in the following program to make it correct?

#include <string>

int main() {

std::string s = “Here I am!”;

std::cout << s;

return 0;

}

#include
#include
#include
#include

Question 9: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

char *abc;

abc = new char[26];

for(int i = 0; i < 26; i++)

abc[i] = ‘a’ + i;

cout << *(abc + 2);

return 0;

}

Question 10: Variable r in class C3, will be…

#include <iostream>

using namespace std;

class C1

{

public int p;

private int q;

protected int r;

};

class C2 : private C1 {};

class C3 : public C2 {};

private
None of these
public
protected

Question 11: What is the output of the following snippet?

#include <iostream>

using namespace std;

#define CALL(param) { if(param) cout << param++; }

int main()

{

int i = 1;

CALL(i);

cout << i;

return 0;

}

Question 12: What is the output of the following snippet?

#include <iostream>

using namespace std;

int doit(int i, int j = 0)

{

return (i * j);

}

int main ()

{

cout << doit(doit(1,2));

return 0;

}

Question 13: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

struct S

{

char *p;

};

class C

{

S s;

public:

C() { s.p = new char; *s.p = ‘A’; }

void p() { cout << ++(*s.p); }

};

int main()

{

C *c = new C();

c->p();

return 0;

}

B
It prints garbage value
Compilation error
A

Question 14: Variable y in class Y, will be…

class X {

private: int x;

protected: int y;

public: int z;

};

class Y : protected X {

};

public
private
protected
none of these

Question 15: What is the output of the following snippet?

#include <iostream>

using namespace std;

int doit(int a, float b)

{

return a / b;

}

int main()

{

float x = doit(1.5f, 2l);

cout << x << “:” << doit(1, 1.f);

return 0;

}

0:1
1:1
1:0
0:0

Question 16: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

const PI = 3.14;

const PI2 = PI * PI;

cout << PI2;

return 0;

}

3
9.8596
3.14
Compilation fails

Question 17: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

const int size = 3;

class Uno {

public: int n;

Uno() { n = 1; }

Uno(int v) { n = v;}

};

class Due : public Uno {

public:

int *arr;

Due() : Uno() {

arr = new int[n];

}

Due(int a) : Uno(a) {

arr = new int[n];

}

~Due() { delete arr; }

};

int main () {

Due d(2);

Due e;

cout << d.n + e.n;

return 0;

}

Question 18: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

const char c = ‘!’;

const char *p;

p = &c;

*p = ‘?’;

cout << *p;

return 0;

}

Compilation fails
?
!
Prints address of c

Question 19: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class Uno {

public: int Int;

};

class Due : public Uno {

public: Due() { Int = 2;}

Due(int x) { Int = x == 0 ? 2 : x – 2; }

};

int main () {

Due d,d2(0);

cout << d.Int – d2.Int;

return 0;

}

Question 20: What is the output of the following snippet?

#include <iostream>

using namespace std;

float doit(int a, int b)

{

return a * b;

}

float doit(float a, float b)

{

return a + b;

}

int main()

{

cout << doit(doit(1,2),doit(3.f,4.f));

return 0;

}

14
9
Compilation error
21

Question 21: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class One

{

char value;

public:

One() { value = ‘A’; }

One(char v) : value(v) {}

void set(char c) {this -> value = c; }

void set() { this -> value = ‘d’; }

char get(){ return value; }

};

int main()

{

One o1,*o2;

o2 = new One(‘b’);

One *p;

p = &o1;

p -> set();

p = o2;

p -> set(‘c’);

cout << o2->get() – o1.get();

return 0;

}

-1
Compilation fails
1
0

Question 22: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class cmplx{

double re, im;

public:

cmplx() : re(1),im(1) {}

cmplx(double r, double i) : re(r),im(i) {}

cmplx operator+(cmplx &);

void out() { cout << “(” << re << “,” << im << “)”; }

};

cmplx cmplx::operator+ (cmplx &a){

cmplx c(this->re + a.re, this->im + a.im);

return c;

}

int main(){

cmplx x(1,2),y,z;

z = x + y;

z.out();

return 0;

}

(2,3)
(3,3)
(2,2)
(3,2)

Question 23: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int i = 8;

do {

i–;

cout << i–;

}

while(i);

return 0;

}

6420
6543210
76543210
7531

Question 24: What is the output of the following snippet?

#include <iostream>

using namespace std;

struct S {

int a;

char b;

struct {

float a;

int b;

} c;

};

int main (int argc, const char *argv[])

{

S s = { 1, 2, 3, 4 };

cout << s.c.a << s.c.b;

}

Question 25: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class Uno {

int val;

public: Uno(int x) { val = x; }

int out() { return val; }

void operator++(int var) {

val += val;

}

};

ostream &operator<<(ostream &o, Uno u)

{

return o << u.out();

}

int main()

{

Uno i(2);

i++;

cout << i;

return 0;

}

Question 26: What is the output of the following snippet?

#include <iostream>

using namespace std;

int doit(int x) {

return x << 1;

}

int main(){

int i;

i = doit(1) || doit(0);

cout << i;

return 0;

}

1
false
true
0

Question 27: What is the output of the following snippet?

#include <iostream>

using namespace std;

int doit(int x) {

return x << 1;

}

int main(){

int i;

i = doit(1) || doit(0);

cout << i;

return 0;

}

1
false
true
0

Question 28: What is the output of the following snippet?

#include <iostream>

using namespace std;

class Sup {

public: virtual void out() { cout << “p”; }

};

class Sub : public Sup {

public: virtual void out() { cout << “b”; }

};

int main()

{

Sub sub;

Sup *sup;

sup = ⊂

sup->out();

sub.out();

return 0;

}

Question 29: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int x = -2, y;

float f = 2.5, g;

g = x;

y = f;

cout << (int)g / y;

return 0;

}

0.8
-0.8
1
-1

Question 30: What is the output of the following snippet?

#include <iostream>

using namespace std;

char max(char x, char y) {

if(x > y)

return y;

else

return x;

}

int main()

{

char chr = max(‘a’, ‘z’);

cout << chr;

return 0;

}

z
Compilation error
a
az

Question 31: Which code, inserted into the main function, generates the output 12?

#include <iostream>

#include <string>

using namespace std;

string fun(string s1, string s2)

{

return s1 + s2;

}

int main()

{

string s=”1″, *t = &s;

//insert code here

return 0;

}

fun(*t,”2″);
fun(“1”,*t);
fun(“1+2”);
fun(*t,s);

Question 32: How many times will the program print HI!?

#include <iostream>

using namespace std;

int X = 5;

int main()

{

cout << “HI!”;

if(X– > 0)

main();

return 0;

}

Six
One
Five
Two

Question 33: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class One {

public: float f;

One(float f) { this -> f = f; }

};

class Two {

public: float f;

Two (One o) { this -> f = o.f; }

void foo() { cout << (int)f; }

};

int main()

{

One o1(3.14);

Two o2 = o1;

o2.foo();

}

3.14
3
Compilation fails
0

Question 34: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

int main()

{

bool t[] = {false, true, false & true};

string u[2] = {“false”, “true”};

bool *p;

p = t + 2;

cout << u[*p];

return 0;

}

1
true
0
false

Question 35: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

int boo(int v)

{

v++;

return ++v;

}

int main()

{

float x = 3;

x = boo(x);

cout << x;

return 0;

}

3
5
-1
1

Question 36: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int i = 10;

float f = 2.5;

cout << float(i) / int(f);

return 0;

}

Question 37: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class Uno {

public: Uno() { cout << “X”; }

};

Uno foo(Uno d)

{

Uno e = d;

return e;

}

int main()

{

Uno u;

foo(u);

return 0;

}

XX
X
XXXX
XXX

Question 38: Which code, inserted into the function main, generates the output 03?

#include <iostream>

using namespace std;

class Uno

{ public: void foo(){ cout << “0”;}

void bar(){ cout << “1”;}

};

class Due : public Uno

{ public: void foo(){ cout << “2”;}

void bar(){ cout << “3”;}

};

int main()

{

Due d;

// insert code here

d.bar();

}

d->Due::foo();
d.Uno::foo();
d.Due::foo();
d->Uno::foo();

Question 39: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class Class1 {

char a;

protected:

char b;

public:

char c;

Class1() { a=’a’; b=’b’; c=’c’; }

};

class Class2 : public Class1 {

char d;

public:

void set() {

c = ‘e’;

d = ‘d’;

}

};

int main () {

Class2 a;

a.set();

cout << a.c << a.d;

return 0;

}

ed
cd
Compilation fails
bd

Question 40: What is the output of the following snippet?

#include <iostream>

using namespace std;

class cmplx{

double re,im;

public:

cmplx() : re(0),im(0) {}

cmplx(double x) { re = im = x; }

cmplx(double x,double y) { re = x; im = y; }

void out() { cout << “(” << re << “,” << im << “)”; }

};

int main(){

cmplx c(1,2), cc(c);

cc.out();

return 0;

}

(2,2)
(1,1)
(2,1)
(1,2)

Question 41: What is the output of the following snippet?

#include <iostream>

#include <cstdarg>

using namespace std;

int calculate(int &val, int arg)

{

val *= arg;

return arg;

}

int main()

{

int i = 1;

int j = calculate(i,2);

cout << i << j;

return 0;

}

Question 42: What happens if we use the operator new and the memory cannot be allocated?

#include <iostream>

#include <exception>

using namespace std;

int main () {

long i = 2000000000;

try

{ char *text = new char[i]; }

catch (bad_alloc& e)

{ cout << “1”; }

catch (exception& e)

{ cout << “2”; }

catch (…)

{ cout << “3”; }

return 0;

}

It prints 1
It prints 2
None of these
It prints 3

Question 43: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main(){

int a = 0;

if (++a == 1) {

cout << (a >> 1);

} else {

cout << (a);

}

return 0;

}

1
0
2
None of these

Question 44: What is the output of the program if the value of 1 is supplied as input?

#include <iostream>

using namespace std;

class Uno {

public: char Char;

};

int main () {

int swtch;

Uno u;

u.Char = ‘5’;

cin >> swtch;

try

{

switch (swtch)

{

case 3: throw 1;

case 2: throw 3.f;

case 1: throw u;

}

catch (int e)

{ cout << e; }

catch (Uno e)

{ cout << e.Char; }

catch (…)

{ cout << “?”; }

return 0;

}

5
1
Compilation error
3

Question 45: What is the output of the following snippet?

#include <iostream>

using namespace std;

bool compare(bool t, bool u)

{

return t < u;

}

int main()

{

cout << compare(true,false);

return 0;

}

true
false
0
1

Question 46: What is the output of the following snippet?

#include <iostream>

using namespace std;

int k = -1;

class Class

{

public: char *adr;

Class() { adr = new char[k]; }

~Class() { delete [] adr; }

};

int fun(void)

{

Class object;

return 0.5f;

}

int main()

{

fun();

return 0;

}

1
0.5
0
Runtime error

Question 47: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main()

{

int i = 0;

for(; i < 5; i++);

cout << i;

return 0;

}

4
01234
5
012345

Question 48: What is the output of the following snippet?

#include <iostream>

using namespace std;

class Alpha {

public: char out(){ return ‘A’; }

};

class Beta : public Alpha {

public: virtual char out(){ return ‘B’; }

};

class Gamma : public Beta {

public: char out(){ return ‘G’; }

};

int main()

{

Alpha *a = new Alpha();

Alpha *b = new Beta();

Alpha *c = new Gamma();

cout << (a->out()) << (b->out()) << (c->out());

return 0;

}

AAA
BBB
ABG
GGG

Question 49: What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

int main()

{

string s1 = “top”;

string s2;

s2.append(s1).append(“down”);

cout << s2;

return( 0 );

}

down
top
downtop
topdown

Question 50: What is the output of the following snippet?

#include <iostream>

using namespace std;

int main (int argc, const char *argv[])

{

float B = 32;

{ char B = ‘1’; cout << B; }

{ int B = 2; cout << B; }

cout << B;

return 0;

}

1322
None of these
3122
3212

Question 51: What is the output of the following snippet?

#include <iostream>

using namespace std;

class X1 {

public: virtual void foo() = 0;

};

class X2 : public X1 {

public: virtual void foo() { cout << “X2”; }

};

class X3 : public X1 {

public: virtual void foo() { cout << “X3”; }

};

int main()

{

X1 *a = new X2(), *b = new X3();

b->foo();

a->foo();

return 0;

}

X3X3
X2X3
X3X2
X2X2

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