CPA-21-02 Online Practice Questions and Answers

Which of the following statements are correct about an array? int tab[10];

A. The array can store 10 elements.

B. The expression tab[1] designates the very first element in the array.

C. The expression tab[9] designates the last element in the array.

D. It is necessary to initialize the array at the time of declaration.

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

#include

using namespace std;

int getValue();

int main()

{

const int x = getValue();

cout<

return 0;

}

int getValue()

{

return 5;

}

A. It will print 0

B. The code will not compile.

C. It will print 5

D. It will print garbage value

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

#include

using namespace std;

class complex{

double re;

double im;

public:

complex(double x) { re=x,im=x;};

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

void print() { cout << re << " " << im;}

};

int main(){

complex c1;

c1 = 3.0;

c1.print();

return 0;

}

A. It prints: 0 0

B. It prints: 1 1

C. It prints: 3 3

D. Compilation error

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

#include

using namespace std;

int main()

{

const char *s;

char str[] = "Hello ";

s = str;

while(*s) {

cout << *++s;

*s++;

}

return 0;

}

A. It will print:"el "

B. The code will not compile.

C. It will print:"Hello "

D. It will print garbage value

Which of the following is a logical operator?

A. and

B. andand

C. ||

D. !

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

A. It prints: 1

B. It causes a compilation error

C. It prints: 0

D. It prints: My exception,

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

using namespace std;

int main(){

int i = 1;

if (i++==1) {

cout << i;

} else {

cout << i-1;

}

return 0;

}

A. It prints: 0

B. It prints: 1

C. It prints: -1

D. It prints: 2

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

#include

using namespace std;

class complex{

double re;

double im;

public:

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

complex(double x) { re=x,im=x;};

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

void print() { cout << re << " " << im;}

};

int main(){

complex c1;

c1.print();

return 0;

}

A. It prints: 1 0

B. It prints: 1 1

C. It prints: 0 0

D. Compilation error

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

#include

#include

using namespace std;

class complex{

double re, im;

public:

complex() : re(1),im(0.3) {}

complex(double n) { re=n,im=n;};

complex(int m,int n) { re=m,im=n;}

complex operator+(complex andt);

void Print() { cout << re << " " << im; }

};

complex complex::operator+ (complex andt){

complex temp;

temp.re = this?>re + t.re;

temp.im = this?>im + t.im;

return temp;

}

int main(){

complex c1(1),c2(2),c3;

c3 = c1 + c2;

c3.Print();

}

A. It prints: 1 1.5

B. It prints: 2 1.5

C. It prints: 3 3

D. It prints: 0 0

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

A. It causes a compilation error

B. It prints: Tesc failed

C. .It prints: failed

D. It prints: Tesc

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

#include

using namespace std;

class First

{

public:

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

};

class Second:public First

{

public:

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

};

void fun(First *obj);

int main()

{

First FirstObject;

fun(andFirstObject);

Second SecondObject;

fun(andSecondObject);

}

void fun(First *obj)

{

obj?>Print();

}

A. It prints: from First

B. It prints: from Firstfrom First

C. It prints: from Firstfrom Second

D. It prints: from Secondfrom Second

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

#include

using namespace std;

int main()

{

union un

{

int x;

char c;

};

union un u1 = {10};

union un u2 = {'a'};

union un u3 = {20, 'a'};

cout<

cout<

cout<

return 0;

}

A. It prints: 10aa

B. It prints: 10a20a

C. It prints: 1a

D. Compilation error

What is the output of the program?

#include

using namespace std;

#define PRINT(i) cout<

int main()

{

int y=2, z=3;

PRINT(y);

PRINT(z);

return 0;

}

A. It prints: 123

B. It prints: 23

C. It prints: 3

D. It prints: 2

What is the output of the program?

#include

#include

using namespace std;

int main()

{

string s1="World";

string s2;

s2="Hello" + s1;

cout << s2;

return( 0 );

}

A. It prints: HelloWorld

B. It prints: Hello

C. It prints: World

D. Compilation error

Which of the following operations is INCORRECT?

A. int i=15;

B. long int k=123

C. float f=12,2;

D. double d=12;