CPA Chapter 8 Assessment Online

1. Question

1 points

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;
class Int {
public:
int v;
Int(int a) { v = a; }
};

int main() {
Int i = 1;
cout << i;
return 0;
}

It prints 0
It prints 1
Compilation fails
It prints 2

2. Question

1 points

What happens when you attempt to compile and run the following code?

#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
It prints 1
It prints 0
It prints 2

3. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

It prints 1
It prints 0
It prints 2
Compilation fails

4. Question

1 points

What happens when you attempt to compile and run the following code?

#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
It prints 2
It prints 1
It prints 0

5. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

It prints 2
Compilation fails
It prints 0
It prints 1

6. Question

1 points

What happens when you attempt to compile and run the following code?

#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) {
a.v++;
return o << a.v;
}

int main() {
Int i = 0;
–i ; i–;
cout << i << i;
return 0;
}

It prints 23
It prints 21
It prints 12
It prints 10
Compilation fails

7. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
i++;
cout << i << i.v;
return 0;
}

It prints 20
It prints 22
It prints 21
Compilation fails

8. Question

1 points

What happens when you attempt to compile and run the following code?

#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 ;

cout << i[2];
return 0;
}

It prints 44
It prints 24
It prints 22
It prints 33
Compilation fails

9. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

Compilation fails
It prints 0
It prints B
It prints 1

10. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

It prints C
It prints 0
Compilation fails
It prints 1

11. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

It prints 0
Compilation fails
It prints 1
It prints 2

12. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

It prints 2
Compilation fails
It prints 1
It prints 0

13. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

Compilation fails
It prints 2
It prints 0
It prints 1

14. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

It prints 2
It prints 0
It prints 1
Compilation fails

15. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

Compilation fails
It prints 2
It prints 1
It prints 0

16. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

It prints 2
It prints 0
It prints 1
Compilation fails

17. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

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

18. Question

1 points

What happens when you attempt to compile and run the following code?

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

19. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

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

20. Question

1 points

What happens when you attempt to compile and run the following code?

#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;
}

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

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