cpa-programming-essentials-in-c++-module-exam-answers:cisco quiz

 

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 4

·        3 1

·        3 2

·        Compilation error

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

·        3212

·        3122

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;

}

·        01234

·        4

·        012345

·        5

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;

}

·        Compilation error

·        It prints garbage value

·        B

·        A

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

·        0

·        1

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, 21);

   cout<<x<<":"<<doit(1,1.f);

   return 0;

}

·        0:1

·        1:0

·        1:1

·        0:0

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;

}

·        1

·        0

·        12

·        112

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

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;

}

a

Compilation error

z

az

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

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)

(2,2)

(3,3)

(3,2)

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;

}

2

None of these

0

1

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

0

true

false

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,s);

fun(*t,"2");

fun("1", *t);

fun("1+2");

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;

}

c

b

a

d

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;

}

3

1

5

Compilation error

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;

}

!

Prints address of c

?

Compilation fails

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;

}

21

11

22

12

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;

}

Two

One

Six

Five

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 : protected Uno

class Due : private Uno

class Due : public Uno

class Due

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;

}

cd

bd

ed

Compilation fails

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;

}

14

12

34

23

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()

{

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

   string u[2] = {"false", "true"};

   bool *p;

   p = t + 2;

   cout << u[*p];

   return 0;

}

1

false

true

0

What is the output of the following snippet?

#include <iostream>

using namespace std;

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

int main()

{

   int i = 1;

   CALL(i);

   cout<<i;

   return 0;

}

1

12

2

11

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

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

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;

}

downtop

down

top

topdown

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;

}

AB

BA

BB

AA

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

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;

}

1

5

-1

3

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 * test = new char[i];}

   catch (bad_alloc& e)

   { cout<<"1";}

   catch (exception& e)

   { cout<<"2";}

   catch (...)

   { cout<<"3";}

   return 0;

}

It prints 1

None of these

It prints 2

It prints 3

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;

}

XX

XXX

X

XXXX

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;

}

4

1

2

3

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;

}

9

21

14

Compilation error

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;

}

987654321

10987654321

9

109

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;

}

1

3

0

2

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;

}

e

c

d

f

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;

}

0.5

4

1

5

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

JaneJane

Jane

Runtime error

Variable y in class Y, will be…

class X {

private:   int x;

protected: int y;

public:    int z;

};

class Y: protected X{

};

none of these

private

public

protected

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;

}

76543210

7531

6543210

6420

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;

}

4

3

2

1

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;

}

0

true

1

false

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)

(1,2)

(2,1)

(1,1)

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 = &sub;

   sub.out();

   return 0;

}

bb

pb

bp

pp

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;

}

X

XXX

XXXX

XX

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();

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;

}

0.5

0

1

Runtime error

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

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();

    b->foo();

    return 0;

}

X3X2

X3X3

X2X3

X2X2