3 rd Unit Test Papers

Third unit test

Set-1

Section a

1.       Define function? Explain the use of return statement?
Ans:

The return statement is used for two purposed, they are:

·         To return a value to the calling function.

Syntax: return(expression);

Ex: 1)return(c); //returning a variable

      2) return(x+y); //returning the expression ie.addition of variables x +y

To return the control back to the calling the function

Syntax: return;

1.       A return statement can appear any where in the function

2.       A function can have no of return statements in the function but one return statement  can be executed

3.       A return statement can return only one value at a time

2.       Write any difference b/w address & dereferencing operators?

3.       What is structure explain with an example?

Section b

4.       Explain various types of function with example programs?

5.       Explain about various dynamic memory management functions?

6.       What is recursion? Write a program to find the factorial of a given number using recursion?

                                               Set-2

1.       Distinguish between actual and formal parameters?
Ans:

Actual parameters	Formal parameters
1.       The parameters specified in the function call are called as actual parameters	The parameters specified in the function declaration are called formal parameters
2.       Sending the value or variable or expression from the function call	Receiving the value or variable from the actual parameters
3.       Ex: swap(a,b); or swap(2,3);      Here a,b or 2,3 are actual parameters	Ex: void swap(int a, int b)       {       } Here a,b are formal parameters
4.       Passing the parameters a,b to swap()	Here a,b are receiving the value or variables
5.       Actual parameters may be variable,value or expression, or structure,address	It must be variable or structure or array but not values or expressions

2.       What is pointer? List the advantages of pointers

Ans:

1.       We can return more than one value from a function

2.       Indirect accessing

3.       It provides dynamic memory management

4.       To pass arrays and strings more conveniently from one function to another function

5.       It provides program execution speed

6.       To manipulate arrays more easily by moving pointers to them instead of moving the arrays themselves

3.       Differentiate between array & structure?
Ans:

Structure	Array
1.       It is a collection of elements(variables) of different data types	1.       It is a collection of elements of same data type
2.       We have to use .(dot) operator or -> (cap) operator for accessing	2.       Subscript for accessing array elements
3.       Syntax: struct  tag {   Datatype memeber1;   Datatype member2;   ……. };	3.       Declaration of array:      Datatype arrayname[size]={list of elements separated by comma};
4.       Example:      struct  student      {      int rollno;      char name[10];      float avg;       };      struct student stud={01,”raj\0”,90.25};	4.       int a[5]={1,2,3,4,5};

                                                                                               Section -b

4.       Explain call by value and call by reference with example programs?

5.       Explain about addressing and dereferencing operators
ans:

Address operator	Dereferencing operators
1.       Address operator is &       Ex: &a where a is a variable	Dereferencing operator is *      Example: *a where a is pointer
2.       It is used to initialize pointer variable	It is used to declare a pointer varialbe
3.       It is a unary operator	It is also unary operator
4.       It returns the address of variable	It returns the value at that address

6.       What are the various storage classes in c explain?

                                Set-3

1.       What is self referential structure?

2.       List various betwise operators in c?

3.       List various I/O function with files?

                                Section-B

4.       Explain various types of functions with example with example programs

5.       Explain about various dynamic memory management functions with examples?

6.       What is recursion? Write a c program to find factorial of a given number using recursion?