CPA – Programming Essentials in C++ Chapter 2 Module 4 Exam Answers

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

#include <iostream>

using namespace std;

class N {

public:

    float x;

    N() { x = 0.0; }

    N(float a) { x = a; }

    N(N &n) { x = n.x; }

    N &operator=(float f) { x = f – 1; return *this; }

};

int main() {

    N a;

    a = 2.0;

    cout << a.x;

    return 0;

}

• 0
• Compilation fails
• 2
• 1

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

#include <iostream>

using namespace std;

class N {

public:

    float x;

    N() { x = 0.0; }

    N(float a) { x = a; }

    N(N &n) { x = n.x; }

    N &operator<<(N &y) { return *new N(x * 10); }

};

int main() {

    N a(2.0),b(4.0);

    N c = a << 1;

    cout << c.x;

    return 0;

}

• Compilation fails
• 1
• 0
• 2

Question 3: What is the output of the following snippet?

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

    Int &operator–() {

        ++v;

        return *this;

    }

    Int &operator–(int v) {

        v+=2;

        return *this;

    }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << a.v++;

}

int main() {

    Int i = 0;

    cout << –i << i–;

    return 0;

}

• 21
• 12
• 23
• 10

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

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << –a.v;

}

int main() {

    Int i = 1;

    cout << i;

    return 0;

}

• Compilation fails
• 1
• 2
• 0

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

#include <iostream>

#include <string>

using namespace std;

class N {

public:

    float x;

    N() { x = 0.0; }

    N(float a) { x = a; }

    N(N &n) { x = n.x; }

    string operator==(N &n) { if(this != &n) return “true”; else return “false”; }

};

int main() {

    N a(1.1), *b = &a;

    cout << (a == *b);

    return 0;

}

• true
• false
• It prints an empty string
• Compilation fails

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

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

    Int &operator++(int x) {

        v+=2;

        return *this;

    }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << a.v;

}

int main() {

    Int i = 0;

    cout << i++ << i.v;

    return 0;

}

• Compilation fails
• 20
• 22
• 21

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

#include <iostream>

using namespace std;

enum T { A = 2, B = -1, C };

T operator+(T t, int i) {

    switch(t) {

        case A: return T(0);

        case B: return static_cast<T>(2);

    default:return (T)1;

    }

}

int main() {

    T i = A + 2;

    cout << i;

    return 0;

}

• 2
• 0
• 1
• Compilation fails

Question 8: What is the output of the following snippet?

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

    Int &operator–() {

        ++v;

        return *this;

    }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << –a.v;

}

int main() {

    Int i = 2;

    cout << i;

    return 0;

}

• Compilation fails
• 0
• 1
• 2

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

#include <iostream>

using namespace std;

enum T { A = 2, B = -1, C };

class Int {

public:

    T v;

    Int(T a) { v = a; }

    Int & operator++() { v += 2; return *this; }

};

ostream &operator <<(ostream &o, Int &a) {

    ++a;

    return o << a.v;

}

int main() {

    Int i = B;

    cout << i;

    return 0;

}

• 0
• 2
• Compilation fails
• 1

Question 10: What is the output of the following snippet?

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

    Int &operator[](int x) {

        v+=x;

        return *this;

    }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << a.v;

}

int main() {

    Int i = 2;

    cout << i.v << i[2];

    return 0;

}

• 44
• Compilation fails
• 24
• 33

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

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

    Int &operator[](int x) {

        v+=x;

        return *this;

    }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << a.v;

}

int main() {

    Int i = 2;

    cout << i.v << i[2];

    return 0;

}

• 44
• Compilation fails
• 24
• 33

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

#include <iostream>

using namespace std;

class N {

public:

    float x;

    N() { x = 0.0; }

    N(float a) { x = a; }

    N(N &n) { x = n.x; }

    N &operator%(N &y) { return *new N((int)x % (int)y.x); }

};

int main() {

    N a(2.0),b(4.0);

    N c = a % b;

    cout << c.x;

    return 0;

}

• 1
• 0
• 2
• Compilation fails

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

#include <iostream>

#include <string>

using namespace std;

class X {

public:

    string n;

    X(string s) : n(s) {}

        void operator() (X x) {

            cout << x.n;

        }

};

int main(void) {

        X x(“a”),y(“b”);

        x(y);

    y(x);

    return 0;

}

• ab
• Compilation fails
• ba
• It prints an empty string

Question 14: What is the output of the following snippet?

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

    Int &operator–() {

        ++v;

        ++v;

        return *this;

    }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << a.v++;

}

int main() {

    Int i = 0;

    cout << –i;

    return 0;

}

• 1
• Compilation fails
• 2
• 0

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

#include <iostream>

using namespace std;

enum T { A = 2, B = -1, C };

class Int {

public:

    T v;

    Int(T a) { v = a; }

    Int & operator++() { v = C; return *this; }

};

ostream &operator <<(ostream &o, Int &a) {

    ++a;

    return o << a.v;

}

int main() {

    Int i = B;

    cout << i;

    return 0;

}

• C
• 1
• Compilation fails
• 0

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

#include <iostream>

#include <string>

using namespace std;

class N {

public:

    float x;

    N() { x = 0.0; }

    N(float a) { x = a; }

    N(N &n) { x = n.x; }

    string operator==(float f) { if(int(x) == int(f)) return “true”; else return “false”; }

};

int main() {

    N a(1.1);

    cout << (a == 1.9);

    return 0;

}

• true
• It prints an empty string
• Compilation fails
• false

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

#include <iostream>

using namespace std;

class Int {

public:

    int v;

    Int(int a) { v = a; }

};

ostream &operator <<(Int &a) {

    return cout << a.v;

}

int main() {

    Int i = 1;

    cout << i;

    return 0;

}

• Compilation fails
• 1
• 0
• 2

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

#include <iostream>

using namespace std;

class N {

public:

    float x;

    N() { x = 0.0; }

    N(float a) { x = a; }

    N(N &n) { x = n.x; }

};

N &operator=(N &y,float f) { return *new N(f); }

int main() {

    N a;

    a = 2.0;

    cout << a.x;

    return 0;

}

• 0
• 2
• 1
• Compilation fails

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

#include <iostream>

using namespace std;

enum T { A, B, C };

class Int {

public:

    T v;

    Int(T a) { v = a; }

};

ostream &operator <<(ostream &o, Int &a) {

    return o << a.v;

}

int main() {

    Int i = B;

    cout << i;

    return 0;

}

• 0
• B
• 1
• Compilation fails

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

#include <iostream>

using namespace std;

string operator>(float l, float r) { if(int(l) > int(r)) return “true”; else return “false”; }

int main() {

    float l = 2.0, r=2.9999;

    cout << (l > r);

    return 0;

}

• It prints an empty string
• Compilation fails
• False
• True