CPA – Programming Essentials in C++ Chapter 2 Module 3 Exam Answers

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

#include <iostream>

#include <exception>

using namespace std;

int main() {

    try {

        throw 2./4;

    }

    catch(int i) {

        cout << i;

    }

    return 0;

}

• Compilation fails
• 0.5
• Execution fails
• 0

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class X : public logic_error {

public:

    X() : logic_error(“0”) {};

};

void z() throw(logic_error) {

    X x;

    throw x;

    cout << 1;

}

int main(void) {

    X x;

    try {

        z();

    } catch(logic_error &i) {

        cout << i.what();

    }

    return 0;

}

• Execution fails
• 0
• Compilation fails
• 1

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class Int {

public:

    int v;

    Int(int a) : v(a) {}

};

void a() {

    throw Int(1);

}

void b() {

    try {

        a();

    } catch(Int &i) {

        throw Int(i.v + 1);

    }

}

void c() {

    try {

        b();

    } catch(…) {

        throw;

    }

}

int main(void) {

    try {

        c();

    } catch(Int &i) {

        cout << i.v;

    }

    return 0;

}

• 0
• Compilation fails
• 1
• 2

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

#include <iostream>

using namespace std;

class X {

public:

    X(void) throw(int) { cout << 1; }

    ~X(void) throw(int) { cout << 2; }

    void exec() { throw string(“0”); }

}; 

void exec(X x) {

    x.exec() ;

}

int main(void) {

    X x;

    try {

        exec(x);

    } catch(int &i) {

        cout << i;

    }

    return 0;

}

• 102
• Compilation fails
• Execution fails
• 120

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class X : public logic_error {

public:

    X() : logic_error(“0”) {};

};

void z() throw(X) {

    throw new logic_error(“0”);

}

int main(void) {

    X x;

    try {

        z();

    } catch(X &i) {

        cout << i.what();

    }

    return 0;

}

• Execution fails
• Compilation fails
• 120
• 102

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

#include <iostream>

#include <exception>

using namespace std;

int main() {

    try {

        throw 2/4;

    }

    catch(int i) {

        cout << i;

    }

    return 0;

}

• Execution fails
• 0.5
• 0
• Compilation fails

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class E {};

void f(int i) {

    E e;

    switch(i) {

    case 0 : throw e;

    case 1 : throw &e;

    }

    cout << 0;

}

int main(void) {

    try {

        f(2);

    } catch(E*) {

        cout << 1;

    } catch(E) {

        cout << 2;

    }

    return 0;

}

• 0
• Compilation fails
• 2
• 1

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class X : public runtime_error {

public:

    X() : domain_error(“0”) {};

};

void z() throw(X) {

    X x;

    throw x;

    cout << 1;

}

int main(void) {

    X x;

    try {

        z();

    } catch(X &i) {

        cout << 1;

    }

    catch(domain_error &i) {

        cout << 0;

    }

    return 0;

}

• Compilation fails
• Execution fails
• 0
• 1

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

#include <iostream>

using namespace std;

class X {

public:

    X(void) { cout << 1; }

    ~X(void) { cout << 2; }

}; 

X *exec() {

    X *x = new X();

    throw string(“0”);

    return x;

}

int main(void) {

    X *x;

    try {

        delete exec();

    } catch(string &s) {

        cout << s;

    }

    return 0;

}

• Execution fails
• 10
• 12
• Compilation fails

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

#include <iostream>

using namespace std;

class X {

public:

    X(void) { cout << 0; }

    ~X(void) { cout << 2; }

}; 

int main(void) {

    try {

        X *x = new X();

    throw true;

        delete x;

    } catch(bool s) {

        cout << s;

    }

    return 0;

}

• Execution fails
• 021
• 01
• Compilation fails

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class E {};

class X {

public:

    static int c;

    X(int a) { c = a; }

    ~X() { if(c++ > 2) throw new E; }

};

int X::c = 0;

void f(int i) {

    X* t[2];

    for(int j = 0; j < i; j++)

        t[j] = new X(i+1);

    for(int j = 0; j < i; j++)

        delete t[j];

}

int main(void) {

    try {

        f(2);

    } catch(…) {

        cout << X::c;

    }

    return 0;

}

• Compilation fails
• 2
• 2
• 3

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class E {};

class X {

    static int c;

public:

    X() { if(c++ > 2) throw new E; }

    ~X() { if(c++ > 2) throw new E; }

};

int X::c = 0;

void f(int i) {

    X a,b;

    cout << i;

}

int main(void) {

    try {

        f(0);

        f(1);

    } catch(…) {

        cout << 1;

    }

    return 0;

}

• Execution fails
• 0
• 01
• Compilation fails

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

#include <iostream>

#include <string>

using namespace std;

class X {

public:

    X(void) { cout << 1; }

    ~X(void) { cout << 2; }

}; 

void exec() {

    {  

        X x;

    }

    throw string(“0”);

}

int main(void) {

    try {

        exec();

    } catch(string &s) {

        cout << s;

    }

    return 0;

}

• 102
• Execution fails
• 120
• Compilation fails

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class Int {

public:

    int v;

    Int(int a) : v(a) {}

};

void a() {

    throw 0;

}

void b() {

    try {

        a();

    } catch(int i) {

        throw Int(i + 1);

    }

}

void c() {

    try {

        b();

    } catch(…) {

        throw;

    }

}

int main(void) {

    try {

        c();

    } catch(Int &i) {

        cout << i.v;

    }

    return 0;

}

• Compilation fails
• 0
• 2
• 1

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class E {};

void f(int i) {

    E e;

    switch(i) {

    case 0 : throw e;

    case 1 : throw &e;

    }

    cout << 0;

}

int main(void) {

    try {

        f(1);

    } catch(void *) {

        cout << 2;

    } catch(E*) {

        cout << 1;

    }

    return 0;

}

• 0
• 1
• 2
• Compilation fails

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

#include <iostream>

using namespace std;

class X {

public:

    X(void) throw(int) { cout << 1; }

    ~X(void) throw(int) { cout << 2; }

    void exec() { throw 0; }

}; 

void exec(X &x) {

    x.exec() ;

}

int main(void) {

    X x;

    try {

        exec(x);

    } catch(int &i) {

        cout << i;

    }

    return 0;

}

• Execution fails
• 120
• 102
• Compilation fails

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

#include <iostream>

#include <exception>

using namespace std;

int main() {

    throw 2/4;

    catch(int i) {

        cout << i;

    }

    return 0;

}

• Compilation fails
• 0.5
• Execution fails
• 0

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

#include <iostream>

#include <exception>

using namespace std;

int main() {

    try {

        throw exception();

    }

    catch(exception &x) {

        cout << x.what();

    }

    return 0;

}

• It prints a non-empty string
• Execution fails
• Compilation fails
• It prints an empty string

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

#include <iostream>

#include <exception>

using namespace std;

int main() {

    try {

        throw 3.14;

    }

    catch(double x) {

        x *= 2;

    }

    cout << x;

    return 0;

}

• It prints a non-empty string
• Execution fails
• Compilation fails
• It prints an empty string

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

#include <iostream>

#include <exception>

#include <stdexcept>

using namespace std;

class X : public domain_error {

public:

    X() : domain_error(“0”) {};

};

void z() throw(X) {

    X x;

    throw x;

    cout << 1;

}

int main(void) {

    X x;

    try {

        z();

    } catch(X &i) {

        cout << 1;

    }

    catch(domain_error &i) {

        cout << 0;

    }

    return 0;

}

• Execution fails
• 1
• 0
• Compilation fails