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CPA – Programming Essentials in C++ Final Exam answers :

CPA – Programming Essentials in C++ Final Exam answers :

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

hat 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

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

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

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
  • f
  • d
  • c

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;

  • AA
  • BB
  • BA
  • AB

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

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()

{

        char *abc;

        abc = new char[26];

        for(int i = 0; i < 26; i++)

            abc[i] = ‘a’ + i;           

        cout << *(abc + 2);

        return 0;

}

  • a
  • d
  • b
  • c

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;

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

int main()

{

    int i = 1;

    CALL(i);

    cout << i;

    return 0;

}

  • 11
  • 1
  • 12
  • 2

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;

}

  • 12
  • 1
  • 112
  • 0

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

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

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

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;

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;

}

  • 2
  • 3
  • 4
  • 1

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

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
  • 0
  • 3
  • 2

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

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

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)

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

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
  • 34
  • 12
  • 23

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;

int doit(int x) {

    return x << 1;

}

int main(){

    int i;

    i = doit(1) || doit(0);

    cout << i;

    return 0;

}

  • 1
  • false
  • true
  • 0

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

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;

        sup->out();

        sub.out();

        return 0;

}

  • bb
  • pb
  • pp
  • bp

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>

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

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);

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

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;

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

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

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;

}

  • 5
  • 1
  • 0.5
  • 4

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

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>

#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

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)

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;

}

  • 11
  • 21
  • 12
  • 22

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

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

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

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

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

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

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>

#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

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

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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