Тест по С и С++

[Fstek]

Здравствуйте!Помогите,пожалуйста, решить тест,как минимум частично)
1. What does the volatile keyword mean? Select correct answer:
A. It’s used to declare very often modified variables. Compiler uses this information for optimization purposes.
B. It’s used to declare that an object can be modified in the program by something such as the operating system, the hardware, or a concurrently executing thread
C. It’s synonym of auto keyword
D. No such a keyword

2. What does this program print? Assume that sizeof(unsigned int) is 4.

#include <stdio.h>

unsigned int * Arith(unsigned int _int1, unsigned int _int2 )
{
	unsigned int _res;
	_res = _int1 - _int2;
	return &_res;
}

int main()
{
	printf(  “%x\n”,   *Arith( 0, 1 ) );
	return 0;
}

Select correct answer.
A. -1
B. This program isn’t correct because of return operator in Arith function
C. fffffff
D. This program isn’t correct because of printf invocation in main function


3. Global variable is defined as static. What does this mean?

#include <stdio.h>
static  int  _int = 0;
int foo()
{
   ….
}

Select correct answer.
A. It’s synonym of const keyword
B. Variable _int cannot be referenced in other translation unit
C. It’s used to declare very seldom modified variable. Compiler uses this information for optimization purposes
D. It’s used to declare that an object can be modified in the program by something such as the operating system, the hardware, or a concurrently executing thread

4. Local variable is defined as static. What does this mean?

int foo()
{
	static  int _int = 0;
	…
}

Select correct answer.
A. It’s used to declare that an object can be modified in the program by something such as the operating system, the hardware, or a concurrently executing thread
B. Variable _int saves its value between invocation of foo
C. It’s synonym of const keyword

5. Is this code correct?

#include <stdio.h>

struct MyStruct
{
	int int1;
	float float1;
};

static struct MyStruct tolick;

struct MyStruct * foo()
{
	int _int = 0;
	scanf("%d", &_int);

	if ( _int == 0 )
	{
		tolick.int1 = 1;
		return &tolick;
	}
	else
	{
		return NULL;
	}
}

int main()
{
	struct MyStruct  *ps = NULL;

	ps = foo();

	if ( ps != NULL && ps->int1 != 0  )
	{
		printf( "Ok\n" );
	}
	else
	{
		printf( "It's not ok\n" );
	}

	return 0;
}

Select correct answer:
A. Operator return &tolick is incorrect in foo function
B. This code is not correct because if ps is NULL machine attempts to read ps->int1
C. This code is correct
D. Variable tolick is read only

6. What will be the output of the program?

#include <stdio.h>

int main()
{
	 int i=5;
	 int j=5;

	 printf( "%d   ", i++ );
	 printf( "%d\n", ++j );

	 return 0;
}

Select correct answer:
A. 6 5
B. 5 5
C. 5 6
D. 6 6
C++

7. What is correct about virtual function?
Select correct answer:
A. It must be redefined in child class
B. It should not return value
C. It could be overwritten in child class
D. Given a base class pointer to a child class object, virtual function defined in the child class will be called

8. What is correct about a reference in a function argument list?
Select correct answer:
A. Same as pointer
B. Same variable as in caller function
C. Return value of virtual function
D. Global variable

9. What is correct template class declaration?
Select correct answer:
A. class x <class T> { }
B. template <class T> class X { }
C. class x <template class T> { }
D. template <class T> T X ( ) { }

10. What are correct streaming operators for declaration: ofstream myfile ("example.txt")?
Select correct answer:
A. myfile << “some string”;
B. myfile >> int_variable;
C. 10 >> myfile;
D. myfile << myfile;

11. What is the output of the following program? Assume that target machine has 32bit architecture.

#include <iostream>
class foo
{
	public: 
	void f1 ()
	{
		std::cout << "foo::f1" << std::endl;
	}
	virtual void f2 ()
	{
		std::cout << "foo::f2" << std::endl;
	}
	foo()
	{
		std::cout << "foo::foo" << std::endl;
	}
	virtual ~foo()
	{
		std::cout << "foo::~foo" << std::endl;
	}
};


class bar: virtual public foo
{
	public:
	void f1 ()
	{
		std::cout << "bar::f1" << std::endl;
	}
	virtual void f2 ()
	{
		std::cout << "bar::f2" << std::endl;
	}
	bar()
	{
		std::cout << "bar::bar" << std::endl;
	}
	virtual ~bar()
	{
		std::cout << "bar::~bar" << std::endl;
	}
};
int main()
{
	foo * a_foo = new bar;
	a_foo->f1();
	a_foo->f2();
	delete a_foo;
	return 0;
}

[Fstek]

С частью,касающейся С++ разобрался(точнее помогли на другом форуме),но С по-прежнему нуждается во внимании программеров)

[rlib]

1. B
2. Проверьте: http://codepad.org/
3. B
4. B
5. C
6. Проверьте: http://codepad.org/