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CPA – Programming Essentials in C++ Chapter 2 Module 1 Exam Answers

CPA – Programming Essentials in C++ Chapter 2 Module 1 Exam Answers

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    float v;

    A() { v = 1.0; }

    A(A &a) { A::v = a.v; cout << “1”; }

    ~A() { cout << “0”; }

    float set(float v) {

        A::v = v;

        return v;

    }

    float get(float v) {

        return A::v;

    }

};

int main() {

    A a,*b = new A(a),*c = new A(*b);

    c->get(b->get(a.set(1.0)));

    delete b;

    delete c;

    return 0;

}

  • 1100
  • Compilation fails
  • 11000
  • 110

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    float v;

    float set(float v) {

        A::v += 1.0;

        return v;

    }

    float set(void) {

        A::v = v + 1.0;

        return 0.0;

    }

    float get(float v) {

        v += A::v;

        return v;

    }

};

int main() {

    A a;

    cout << a.get(a.set(a.set(a.set())));

    return 0;

}

  • 3
  • 1
  • 2
  • Complilation failed

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    float v;

    float set(float v) {

        A::v += 1.0;

        A::v = v + 1.0;

        return v;

    }

    float get(float v) {

        v += A::v;

        return v;

    }

};

int main() {

    A a;

    cout << a.get(a.set(a.set(0.5)));

    return 0;

}

  • Compilation fails
  • 2
  • 2.5
  • 1.5

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A(A &a) { v = a.get(0.0); }

    A(float v) { A::v = v; }

    float v;

    float set(float v) {

        A::v += v;

        return v;

    }

    float get(float v) {

        return A::v + v;

    }

};

int main() {

    A a(0.), b = a;

    cout << a.get(b.set(1.5));

    return 0;

}

  • 1.5
  • 4.5
  • Compilation fails
  • 2.5

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    float v;

    float set(float v) {

        v += 1.0;

        this -> v = v;

        return v;

    }

    float get(float d) {

        v += 1.0;

        return v;

    }

};

int main() {

    A a;

    cout << a.get(a.set(a.set(0.5)));

    return 0;

}

  • 3.5
  • 2.5
  • 1.5
  • Compilation fails

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    int cnt;

    void put(int v);

};

void A::put(int v)  { cout << ++cnt; }

int main() {

    A a[2];

    a[0].cnt = 0;

    a[1].cnt = 1;

    a[a[0].cnt].put(a[1].cnt);

    return 0;

}

  • Compilation fails
  • 0
  • 1
  • 2

What is the output of the following snippet?

#include <iostream>

#include <string>

using namespace std;

class A {

public: string a(string b) {

    return b.substr(0,2);

}};

class B {

public: string a(string b) {

    return b.substr(2,2);

}};

int main() {

    A a;

    B b;

    cout << a.a(b.a(“ABCD”));

    return 0;

}

  • CD
  • ABCD
  • AB
  • Compilation fails

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A(float v) { A::v = v; }

    float v;

    float set(float v) {

        A::v = v;

        return v;

    }

    float get(float v) {

        return A::v;

    }

};

int main() {

    A *a = new A(1.0), *b = new A(*a);

    cout << a->get(b->set(a->v));

    return 0;

}

  • 2
  • Compilation fails
  • 1
  • 4

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A(A &a) { v = a.get(0.0); }

    A(float v) { A::v = v; }

    float v;

    float set(float v) {

        A::v += v;

        return v;

    }

    float get(float v) {

        return A::v + v;

    }

};

int main() {

    A *a = new A(1.0), *b = new A(*a);

    cout << a->get(b->set(a->v));

    return 0;

}

  • 4
  • 1
  • Compilation fails
  • 2

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    float v;

    A(float x) : v(x) {}

};

class B {

public:

    A a;

    float b;

    B(float x) : a(x + 1) { b = a.v; }

};

int main() {

    B b(2.0);

    cout << b.b;

    return 0;

}

  • 2
  • Compilation fails
  • 3
  • 1

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A() { v = 2.5; }

    float v;

    float set(float v) {

        A::v += 1.0;

        return v;

    }

    float get(float v) {

        v += A::v;

        return v;

    }

};

int main() {

    A a;

    cout << a.get(a.set(1.5));

    return 0;

}

  • 1
  • Compilation fails
  • 3
  • 5

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    float v;

    A() { v = 1.0; }

    A(A &a) { A::v = a.v; cout << “1”; }

    ~A() { cout << “0”; }

    float set(float v) {

        A::v = v;

        return v;

    }

    float get(float v) {

        return A::v;

    }

};

int main() {

    A a, b = a;

    return 0;

}

  • 11100
  • Compilation fails
  • 1100
  • 100

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A() { v = 2.5; }

    float v;

    float set(float v) {

        A::v += 1.0;

        return v;

    }

    float get(float v) {

        v += A::v;

        return v;

    }

};

int main() {

    A a;

    a.A();

    cout << a.get(a.set(1.5));

    return 0;

}

  • 5
  • 3
  • 1
  • Compilation fails

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A(float v) { A::v = v; }

    float v;

    float set(float v) {

        A::v += v;

        return v;

    }

    float get(float v) {

        return A::v + v;

    }

};

int main() {

    A a,b(1.0);

    cout << a.get(b.set(1.5));

    return 0;

}

  • 4
  • Cmpilation fails
  • 2
  • 1

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A(A *v) { A::v = v; }

    A() { A::v = 1.0; }

    float v;

    float set(float v) {

        A::v = v;

        return v;

    }

    float get(float v) {

        return A::v;

    }

};

int main() {

    A a,*b = new A(a);

    cout << a->get(b->set(a->v));

    return 0;

}

  • Compilation fails
  • 2
  • 4
  • 1

What is the output of the following snippet?

#include <iostream>

using namespace std;

    class A {

public:

    float v;

    A() : v(1.0) {}

    A(A &a) : v(2.0) {}

    A(float f) : v(3.0) {}

    float get() {

        return A::v;

    }

};

int main() {

    A a, b(a.get()), c(b);

    cout << a.v + b.v + c.v;

    return 0;

}

  • Compilation fails
  • 9
  • 6
  • 3

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    A() { v = 2.5; }

    A(float v) { A::v = v + 1.0; }

    float v;

    float set(float v) {

        A::v += 1.0;

        return v;

    }

    float get(float v) {

        v += A::v;

        return v;

    }

};

int main() {

    A a,b(1.0);

    cout << a.get(b.set(1.5));

    return 0;

}

  • 2
  • 4
  • 1
  • Compilation fails

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

    int cnt;

    void put(int v) { cout << cnt++; }

};

int main() {

    A a;

    a.cnt = 0;

    a.put(1);

    a.put(1);

    return 0;

}

  • 1
  • 0
  • Compilation fails
  • 2

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

public:

    int data[3];

private:

    int cnt;

public:

    void put(int v) { data[cnt++] = v; }

    int take() { int c = cnt; cnt = 0; return c; }

};

int main() {

    A a;

    a.take();

    a.put(a.take());

    a.put(1);

    cout << a.data[0];

    return 0;

}

  • 1
  • 2
  • Compilation fails
  • 0

What is the output of the following snippet?

#include <iostream>

using namespace std;

class A {

    int data[3];

public:

    int cnt;

    void put(int v) { data[cnt++] = v; }

};

int main() {

    A a;

    a.cnt = 0;

    a.put(1);

    a.put(1);

    cout << a.cnt;

    return 0;

}

  • 0
  • 2
  • Compilation fails
  • 1

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