CPA Online Practice Questions and Answers

What happens when you attempt to compile and run the following code?

#include

using namespace std;

class First

{

public:

void Print(){ cout<<"from First";}

};

class Second

{

public:

void Print(){ cout<< "from Second";}

};

int main()

{

First FirstObject;

FirstObject.Print();

Second SecondObject;

SecondObject.Print();

}

A. It prints: from First

B. It prints: from Firstfrom First

C. It prints: from Firstfrom Second

D. It prints: from Secondfrom Second

Point out an error in the program.

#include

using namespace std;

int main()

{

const int x=1;

int const *y=andx;

cout<<*y;

return 0;

}

A. No error

B. Error: unknown pointer conversion

C. cannot convert from 'const int *' to 'int *const'

D. Compilation error

What happens when you attempt to compile and run the following code?

#include

using namespace std;

int main()

{

int i=2;

switch(i)

{

case 1:

cout<<"Hello";

case 2:

cout<<"world";

case 3:

cout<<"End";

} return 0;

}

A. It prints: Hello

B. It prints: world

C. It prints: worldEnd

D. It prints: End

What happens when you attempt to compile and run the following code?

#include

using namespace std;

int main() {

float i = 1.0 / 2 * 2 / 1 * 2 / 4 * 4 / 2;

cout << i;

return 0;

}

A. It prints: 0

B. It prints: 1

C. It prints: 2

D. It prints: 0.5

What happens when you attempt to compile and run the following code?

#include

using namespace std;

class Base {

int age;

public:

class C {

int b;

void PrintC() { cout << b; }

};

Base () {age=5;};

void setAge(int a=20) {age = a;}

void Print() { cout << age;}

};

int main () {

Base a;

A. setAge(10);

B. Print(); return 0; }

C. It prints: 1020

D. It prints: 105

E. It prints: 10

F. It prints: 20

What happens when you attempt to compile and run the following code?

#include

using namespace std;

class BaseC

{

public:

int *ptr;

BaseC() { ptr = new int(10);}

BaseC(int i) { ptr = new int(i); }

~BaseC() { delete ptr; }

};

void fun(BaseC x);

int main()

{

BaseC *o = new BaseC(5);

fun(*o);

}

void fun(BaseC x) {

cout << "Hello:"<<*x.ptr;

}

A. It prints: Hello:50

B. It prints: Hello:10

C. It prints: Hello:5

D. Compilation error

Which code, inserted at line 10, generates the output "2?1"?

#include

#include

using namespace std;

class A {

protected:

int y;

public:

int z;

};

//insert code here

public:

void set() {

y = 2;

z = 3;

}

void Print() { cout << y << z; }

};

int main () {

B b;

A. set();

B. z = ?1;

C. Print(); return 0; }

D. class B : private A {

E. class B : public A {

F. class B : protected A {

G. class B {

What happens when you attempt to compile and run the following code?

#include

using namespace std;

class A {

public:

int x;

A() { x=0;}

};

class B : protected A {

public:

int y;

using A::x;

B(int y) {this?>y = y;}

void Print() { cout << x << y; }

};

int main () {

B b(5);

A. Print(); return 0; }

B. It prints: 05

C. It prints: 0

D. It prints: 5

E. It prints: 15

What happens when you attempt to compile and run the following code? #include

#include

using namespace std;

struct Person {

string name;

int age;

};

class First

{

Person *person;

public:

First() {person = new Person;

person?>name = "John";

person?>age = 30;

}

void Print(){

cout<name << " "<< person?>age;

}

};

int main()

{

First t[2];

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

t[i].Print();

}

A. It prints: 30

B. It prints: John

C. It prints: John 31

D. It prints: John 30John 30

What happens when you attempt to compile and run the following code?

#include

#include

using namespace std;

struct Person {

string name;

int age;

};

class First

{

Person *person;

public:

First() {person = new Person;

person?>name = "John";

person?>age = 30;

}

void Print(){

cout<name << " "<< person?>age;

}

};

int main()

{

First t;

A. Print(); }

B. It prints: 30

C. It prints: John

D. It prints: John 30

E. It prints: John 30John 30