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 CS201 FINALTERM PAPER 2010

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PostSubject: CS201 FINALTERM PAPER 2010   Sat Aug 07, 2010 11:03 pm


Question No: 1 ( Marks: 1 ) - Please choose one


*.doc is _____________ by type.
.


► Sequential File


► Random Access File


► Data File


► Record File





Question No: 2 ( Marks: 1 ) - Please choose one


Which of the following is NOT a preprocessor directive?


► #error

► #define


► #line


► #ndefine







Question No: 3 ( Marks: 1 ) - Please choose one


The return type of operator function must always be void.


► True

► False



Question No: 4 ( Marks: 1 ) - Please choose one

What does (*this) represents?



► The current function of the class


► The current pointer of the class


► The current object of the class


► A value of the data member




Question No: 5 ( Marks: 1 ) - Please choose one

The statement cin.get (); is used to,



► Read a string from keyboard


► Read a character from keyboard


► Read a string from file


► Read a character from file




Question No: 6 ( Marks: 1 ) - Please choose one
When we do dynamic memory allocation in the constructor of a class, then it is necessary to provide a destructor.



► True



► False




Question No: 7 ( Marks: 1 ) - Please choose one
Overloaded new operator function takes parameter of type size_t and returns

► void (nothing)


► void pointer


► object pointer


► int pointer





Question No: 8 ( Marks: 1 ) - Please choose one


The second parameter of operator functions for << and >> are objects of the class for which we are overloading these operators.



► True

► False



Question No: 9 ( Marks: 1 ) - Please choose one
C++ is a case-sensitive language

► True

► False

Question No: 10 ( Marks: 1 ) - Please choose one
To include code from the library in the program, such as iostream, a directive would be called up using this command.

► #include “iostream.h”

► include

► include

► #include



Question No: 11 ( Marks: 1 ) - Please choose one
A template function must have only generic data types.


► True

► False



Question No: 12 ( Marks: 1 ) - Please choose one
Template class can not have static variables.

► True

► False



Question No: 13 ( Marks: 1 ) - Please choose one


What will be the correct syntax to assign an array named arr of 5 elements to a pointer ptr?


► *ptr = arr ;


► ptr = arr ;


► *ptr = arr[5] ;


► ptr = arr[5] ;





Question No: 14 ( Marks: 1 ) - Please choose one


What will be the correct syntax to access the value of fourth element of an array using pointer ptr?


► ptr[3]

► (ptr+3)

► *(ptr+3)

► Both 1and 3



Question No: 15 ( Marks: 1 ) - Please choose one
If most significant bit of un-signed number is 1 then it represents a positive number.


► True

► False



Question No: 16 ( Marks: 1 ) - Please choose one
If there is a symbol (& sign) used with the variable name followed by data type then it refers to _____ and if & is being used with variable name then it refers to _____.




► Address of variable, reference variable

► Reference variable, value of variable

► Reference variable, address of variable

► Address of variable, value of variable



Question No: 17 ( Marks: 1 ) - Please choose one
We can also do conditional compilation with preprocessor directives.

► True

► False



Question No: 18 ( Marks: 1 ) - Please choose one
The default value of a parameter can be provided inside the ________________

► function prototype

► function definition

► both function prototype or function definition

► none of the given options.






Question No: 19 ( Marks: 1 ) - Please choose one
Classes defined inside other classes are called ________ classes

► looped

► nested

► overloaded

► none of the given options.



Question No: 20 ( Marks: 1 ) - Please choose one
What purpose do classes serve?


► Data encapsulation

► Providing a convenient way of modeling real-world objects


► Simplifying code reuse


► All of the given options





Question No: 21 ( Marks: 1 ) - Please choose one
Every class contains _______________.



► Constructor


► Destructor


► Both a constructor and a destructor


► None of the given options




Question No: 22 ( Marks: 1 ) - Please choose one
new operator is used to allocate memory from the free store during


► Compile Time


► Run Time


► Link Time


► None of the given options


Question No: 23 ( Marks: 1 ) - Please choose one
When an object of a class is defined inside another class then,


► Destructor of enclosing class will be called first


► Destructor of inner object will be called first

► Constructor and Destructor will be called simultaneously

► None of the given options



Question No: 24 ( Marks: 1 ) - Please choose one
It is possible to define a class within another class.


► True

► False

Question No: 25 ( Marks: 1 ) - Please choose one
New and Delete are also used with ___________ and data types as well.


► Class, Objects


► Structures, Pointers


► Both Class and structures


► None of above


Question No: 26 ( Marks: 1 ) - Please choose one
With New keyword, data types and class members are initialized with meaningful values instead of garbage.


► True


► False



Question No: 27 ( Marks: 2 )
How many arguments a Unary Operator take? Can we make a binary operator as unary operator?
Ans: Unary operator takes only one aurgument like i++ or i— (Post increment or post decrement operators for intergers) or ++i,--i (Pre increment or pre decrement operators for intergers) ,we can not make Unary operator as binary or binary as Unary operator.



Question No: 28 ( Marks: 2 )
Which arithmetic operators cannot have a floating point operand?
Ans:
Modulus operator
This operator can only be used with integer operands ONLY













Question No: 29 ( Marks: 2 )
What are manipulators? Give one example.

Ans:
The manipulators are like something that can be inserted into stream, effecting a change in the behavior. For example, if we have a floating point number, say pi (л), and have written it as float pi = 3.1415926 ; Now there is need of printing the value of pi up to two decimal places i.e. 3.14 . This is a formatting functionality. For this, we have a manipulator that tells about width and number of decimal points of a number being printed.
Some manipulators are parameter less. We simply use the name of the manipulator that works. For example, we have been using endl, which is actually a manipulator, not data. When we write cout << endl ; a new line is output besides flushing the buffer. Actually, it manipulates the output stream.


Question No: 30 ( Marks: 2 )
Write down piece of code that will declare a matrix of 3x3. And initialize all its locations with 0;
Ans:
int matrix [3] [3] ;

matrix [0] [0] = 0;
matrix [0] [1] = 0;
matrix [0] [2] = 0;
matrix [1] [0] = 0;
matrix [1] [2] = 0;
matrix [1] [2] = 0;
matrix [2] [0] = 0;
matrix [2] [1] = 0;
matrix [2] [2] = 0;


we can also do it as given below

int matrix [3][3] = { 0 }; //all elements 0


Question No: 31 ( Marks: 3 )
Which one (copy constructor or assignment operator) will be called in each of the following code segment?
1) Matrix m1 (m2);
2) Matrix m1, m2;
m1 = m2;
3) Matrix m1 = m2;

Ans:
1) Matrix m1 (m2); copy constructor
2) Matrix m1, m2;
m1 = m2; assignment operator
3) Matrix m1 = m2; assignment operator


Question No: 32 ( Marks: 3 )
What will be the output of following function if we call this function by passing int 5?

template
T reciprocal(T x)
{
return (1/x);
}

Ans:
1/5



Question No: 33 ( Marks: 3 )
Identify the errors in the following member operator function and also correct them.
math * operator(math m);

math * operator (math m)
{
math temp;
temp.number= number * number;
return number;

}
ANS:
The errors are in the arguments of the member operation function and also in the body of operator member function.

Correct function should be

math *operator(math *m);

math *operator (math *m)
{
math temp;
temp = m;
temp.number= number * number;
return temp.number;

}




Question No: 34 ( Marks: 5 )
Write a program which defines three variables of type double which store three different values including decimal points, using setprecision manipulators to print all these values with different number of digits after the decimal number.

Ans:
#include
#include

int main ()
{
double x1 = 12345624.72345
double x2 = 987654.12345
double x3 = 1985.23456
cout << setprecision (3) << x1<< endl;
cout << setprecision (4) << x2 << endl;
cout << setprecision (5) << x3<< endl;

return 0;
}



Question No: 35 ( Marks: 5 )
What are the advantages and disadvantages of using templates?


Ans:
Many thing can be possible without using templates but it do offer several clear advantages not offered by any other techniques:
Advanatages:
• Templates are easier to write than writing several versions of your similar code for different types. You create only one generic version of your class or function instead of manually creating specializations.
• Templates are type-safe. This is because the types that templates act upon are known at compile time, so the compiler can perform type checking before errors occur.
• Templates can be easier to understand, since they can provide a straightforward way of abstracting type information.
• It help in utilizing compiler optimizations to the extreme. Then of course there is room for misuse of the templates. On one hand they provide an excellent mechanism to create specific type-safe classes from a generic definition with little overhead.
Disadvantages:
On the other hand, if misused
• Templates can make code difficult to read and follow depending upon coding style.
• They can present seriously confusing syntactical problems esp. when the code is large and spread over several header and source files.
• Then, there are times, when templates can "excellently" produce nearly meaningless compiler errors thus requiring extra care to enforce syntactical and other design constraints. A common mistake is the angle bracket problem.



Question No: 36 ( Marks: 5 )
Suppose a program has a math class having only one data member number.
Write the declaration and definition of operator function to overload + operator for the statements of main function.
math obj1, obj2;
obj2= 10 + obj1 ;
Ans:
#include
math
{
mth operator + (obj1,obj2)
mth operator + (obj1,obj2)
{
mth operator + (obj1,obj2)
mth operator + (obj1,obj2)

}
}
……………………………………………………………………………


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