CS253 IQ 07

Show Main.IQ07 as a slide show.

Cañon City

How many bytes are needed for the “a” in “Cañon City”?

1. 0
2. 1
3. 2
4. 3
5. 4

cout << "a"s.size() << '\n';

1

Cañon City

How many bytes are needed for the “ñ” in “Cañon City”?

1. 0
2. 1
3. 2
4. 3
5. 4

cout << "ñ"s.size() << '\n';

2

Cañon City

What will this code display?

string s = "Cañon City";
cout << s[4] << '\n';

o

1. C
2. a
3. ñ
4. o
5. n

What problem do virtual functions deal with?

1. Fireball
2. Invisibility
3. Polymorphism
4. Regeneration
5. Simulacrum

Which of these is correct?

class Base { };
class Derived : public Base { };
Base *b = …;
Derived *d = …;

1. b = dynamic_cast<Base *>(d);
2. b = dynamic_cast(Base *, d);
3. b = dynamic_cast(d);
4. d = dynamic_cast(b);
5. d = dynamic_cast<Derived *>(b);
6. d = dynamic_cast(Derived *, b);

Any problems with this code?

#ifndef FOO_H_INCLUDED

#include "otherfile.h"
#include <string>
class Foo {
   …
};

#define FOO_H_INCLUDED
#endif

1. It’s fine.
2. The #ifndef should be #ifdef.
3. The define is in the wrong place.
4. It’s unnecessary—include guards are no longer required in modern compilers.