C++ Test 1

1.If you have “int main(int argc, char* argv[])” and invoke your program this way: prog.exe a.out -i 2 -g -x 3 4 What will be the value of argc?

• Other
• I don’t know
• a.out
• 7
• 3
• 2
• 0

2.If n=3, what will be the result of:

switch(n)
{
case '3':
cout << "wow \n";
break;
case 3:
cout << "bab \n";
break;
default:
cout << "heh \n";
break;
}

• wow
• Undefined behaviour
• I don’t know
• heh
• Compiler error
• bab

3.Which header file you should include for C++ file I/O?

• Other
• iostream
• ifstream
• I don’t know
• fstream
• fileio

4.What is the default access permission for members in a class?

• public
• protected
• private
• I don’t know

5.What is the default access permission for members in a struct?

• public
• protected
• private
• I don’t know

6.What will be the result of:

int f(int a) { return ++a; }
int f(unsigned int a) { return --a; }
cout << f(5);

• Undefined behaviour
• I don’t know
• Compiler error
• 6
• 5
• 4

7.What will !((1 || 0) && 0) evaluate to?

• Wrong code
• Undefined behaviour
• I don’t know
• 1
• 0

8.If i = 5, what will be the result of:

do
{
cout << (--i)-- << " ";
} while(i>=2 && i < 5);

• It won’t enter the loop

• It will loop forever
• I don’t know
• Compiler error
• 4 3 2 1
• 4 3 2
• 4 2 1
• 4 2

9.What will be the result after running this code:

for(int i=0;i<3;i++)
{
cout << i << " ";
continue;
cout << 7 << " ";
break;
for(int j=0;j<1;j++)
cout << 5 << " ";
}

• None of these
• I don’t know
• 0 7 5 1 7 5 2 7 5
• 0 7 1 7 2 7
• 0 1 2

10.What will be printed on the screen after running:

int x=65, *p = &x;
cout << p << "__" << *p ;

• Program will crash

• Other
• MemoryAddress_65
• I don’t know
• Compiler error
• 65_MemoryAddress

11.In which header file is the function isalpha()?

• string.h
• Other
• ifstream.h
• I don’t know
• ctype.h
• conio.h

12.Which one is correct?

• int a; a = new sizeof(int*20);
• int a; a = new int[20];
• int a; a = new int(20);
• int *a; a = new sizeof(int*20);
• int *a; a = new int[20];
• int *a; a = new 20;
• I don’t know

13.How do you access the last cell of “int arr[123];”?

• Other
• I don’t know
• arr[124]…
• arr[123]…
• arr[122]…

14.May the main() function be overloaded?

• Yes
• No
• I don’t know

15.If we have:

int f(int x)
{
if(x>2)
return x + f(--x);
else
return 0;
}

What will be the resulf of: cout << f(5);

• Program will freeze
• Other
• I don’t know
• 6
• 12
• 10
• 0

16.If Foo is a member function of a class, which of the following uses of const is legal?

• void Foo(Squid& a) const;
• void Foo(const Squid& a);
• void Foo(const Squid& a) const;
• None of the above
• const void Foo(const Squid& a) const;
• All of the above
• I don’t know

17.If Foo is a static function in a class, which of the following uses of const is legal?

• void Foo(Squid& const a);
• void Foo(const Squid& a);
• void const Foo(Squid& a);
• void (Squid& a) const;
• I don’t know

18.Is it possible that a class does not have a name?

• Yes, but you can’t have objects from it
• Yes, and you can have objects from it
• No
• I don’t know

19.If we have this code:

char arr[8];
cin >> arr;

And this text is entered: “Hello World”, what there will be in “arr”?

• Other
• I don’t know
• Hello World
• Hello Wo
• Hello W
• Hello

20.If we have this code:

class A
{
public:
A() { cout << 1; }
~A() { cout << 2; }
};
class B : public A
{
public:
B() { cout << 3; }
~B() { cout << 4; }
};

21.And we create an object from class B, what will be the result?

• Other
• I don’t know
• 3412
• 3142
• 3124
• 1342
• 1324
• 1234

22.What will be the result of: cout << (5 << 3); ?

• I don’t know
• Compiler error
• 53
• 40
• 35

23.What will be the result of: cout << 22/5*3; ?

• Other
• I don’t know
• 13.2
• 12
• 1.47
• 1

24.Which keyword specifies that an integer variable can not take negative values?

• unsigned
• There is not such a keyword
• positive
• Other
• long
• I don’t know

25.If we have: char a; , which one is incorrect?

• I don’t know
• All are correct
• a = 3;
• a = ‘3′;
• a = “3″;

26.What will happen if we have this code:

char a[3] = {’d',’w',’\0′};
char b[3];
b = a;

• Other
• I don’t know
• Compiler error
• “b” will be unchanged
• “b” will be the same as “a”

27.Is this code legal?

int a; int b[a];

• Yes
• No
• I don’t know
  

28.If we have:


int a=9; //in the global space...
void f() { int a; a = 4; }

29.And if we type: cout << a; in the main() function, what will be the result?

• Other
• I don’t know
• 9
• 4
• 0

30.If we have this code:


class A { public: int a; };
A *obj;

How do we access the “a” variable?

• obj::a

• obj.a
• obj-a
• obj->a
• I don’t know

31.Which of these has the highest precedence?

• I don’t know
• /
• ++
• +
• *
• ()

32.What should you do to free the memory after running this code?

char *a; a = new char[20];

• I don’t know
• delete [] a;
• delete a[];
• delete a;

Tags: class, function, struct