Question PaperProgramming and Problem solving in C (MC151) : January 2006

Section A : Basic Concepts (30 Marks)

1.“x” and “y” are called
(a) Actual parameters (b) Local variables (c) Formal parameters (d) Local parameters

(e) Global variables.
2.“c” is called
(a) Actual parameter (b) Local variable (c) Formal parameter (d) Local parameter

(e) Global variable.
3.The declaration “void foo (int x, int & y)” is called a
(a) Function body (b) Function type (c) Function stereotype (d) Function prototype (e) Function printtype.
4.The function “foo” returns the following type as result
(a) Integer (b) No result is returned (c) Float (d) Char (e) Double.
5.An example of a value parameter in the code above is
(a) x (b) y (c) c (d) foo (e) fo.
6.C programming language was developed by
(a) Dennis Ritchie (b) Ken Thompson (c) Bill Gate (d) Peter Norton (e) Donald Hearn.
7.When a program is running the value of a constant
(a) Can be changed (b) Cannot be used (c) Is always hidden (d) Cannot be changed

(e) Can be used.
8.The benefit of using enumeration data types in a program is
(a) Program becomes shorter (b) Program becomes longer (c) Program is easy to understand(d) Program executes faster (e) Program become complex.
9.What is the result of the expression 6+12*3–4/2 ?
(a) 22 (b) 25 (c) 40 (d) 52 (e) 45.
10.How many characters can a string hold when declared as char name [20]; ?
(a) 18 (b) 19 (c) 20 (d) 21 (e) 22.
11.What result is in the variable num1 after execution of the following statements?
int j = 1, num1 = 4;
while (++j <= 10)
{
num1++;
}
(a) 11 (b) 12 (c) 13 (d) 14 (e) 15.
12.What is the final value of x if initially x has the value 0?
if (x >= 0)
x += 5;
if (x >= 5)
x += 2;
(a) 0 (b) 2 (c) 5 (d) 7 (e) 8.
13.Which header file contains the function prototypes for the standard input /output library functions and information used by them?
(a) (b) (c) (d) (e) .

14. A function prototype is
(a) A definition of the function
(b) A declaration statement in the called program
(c) A declaration statement in the calling program
(d) A function call in the program
(e) A sterotype in the program.
15.What is the value of i after this segment of the program is executed?
n = 27;
i = 0;
for( i = 0; i <= n; i+= 2 ) {
printf(i );
(a) 25 (b) 28 (c) 27 (d) 26 (e) 29.
16.What is the value of the variable c after the switch statement below?
x = 3;
switch ( x ) {
case 1 : c = 'A'; break;
case 2 : c = 'B'; break;
case 3 : c = 'C'; break;
default: c = 'F'; break;
}

(a) S (b) B (c) C (d) F (e) AB.
17.Which of the following is the function prototype of a function f1 that receives an int pointer and float reference and returns an int pointer?
(a) int f1(int &, float *) (b) float* f1(float &, int &) (c) int* f1 (int *, float &)

(d) int f1 *(int *, float &) (e) int f1(&int,*float).
18.Consider the following declaration :float a, b;
How much memory will be reserved for the above two declared variables.
(a) 1 bytes (b) 4 bytes (c) 8 bytes (d) 16 bytes (e) 20 bytes.
19.What is the return value of the following function if the function is called as
int value = fun(6);
int fun(int n)
{
if( n = = 1 n = = 2) return 1;
else return( fun(n-1) + fun(n-2) );
}
(a) 1 (b) 2 (c) Syntax error (d) 8 (e) 5.
20.The getchar() function reads a
(a) String from a file (b) Character from a file (c) String from the keyboard

(d) Character from the keyboard (e) Word from the file.
21.FILE is -------------
(a) Stack (b) Pointer (c) Union (d) Structur (e) Variable.
22.Multiline macros can be defined by placing ____ at the end of each line except the Last.
(a) / (b) # (c) @ (d) \ (e) $.
23.Which of the following is an advantage of using macros over functions?
(a) Functions must have parameters; macros do not
(b) The code associated with a function is expanded in line
(c) Values passed to functions must be of a specific data type; values passed to macros do not
(d) When macros are used many times in a program they are expanded each time
(e) The code associated with a function is not expanded in line.
24.m = 5 and y = ++m. The value of m and y after incrementation is
(a) m is 5 and y is 5 (b) m is 5 and y is 6 (c) m is 6 and y is 6
(d) m is 6 and y is 5 (e) m is 7 and y is 5.
25.The storage class of a local variable is
(a) Auto (b) Static (c) Extern (d) Register (e) Default.
26.In mixed mode expressions,
(a) Operands of lower type get automatically converted to higher type
(b) Operands of higher type get automatically converted to lower type
(c) Operands of higher and lower type get interchanged
(d) Operands of lower and higher type remain unchanged
(e) Operands of lower type get automatically converted to lower type.
27.If you declare an array without stating the elements it will be set to
(a) A null value (b) Zero (c) Garbage value (d) Set of characters (e) Set of words.
28.Write the last element of the following array.
Char flag[]=“FALSE”
(a) E (b) e (c) \0 (d) “ ” (e) /0.
29.Which of the following functions are used in unformatted data files?
(a) fscanf (b) fwrite (c) fread (d) fwrite & fread (e) fscanf & fwrite
30.Which of the following is “stringzizing operator”?
(a) $ (b) % (c) # (d) ? (e) &&.

Section B : Problems (50 Marks)
1.

a. Write a program to display the sum and count of all numbers between 100 and 200 which are divisible by 7.
b. Write a program in C language to print Armstrong numbers between 1 to 500.

(5 + 5 = 10 marks)
2. Write a Program in C language to perform bubble sort. (10 marks)
3.

a. Write a Program to convert a decimal into its binary representation using recursion.
b. Write a program in C to demonstrate static variables using functions. (5 + 5 = 10 marks)
4. Write a program in C language to swap values of the variables using call by value and call by reference. (10 marks)
5.

a. What's the difference between these two declarations?
struct x1 { ... };
typedef struct { ... } x2;

b. I am trying to declare a pointer and allocate some space for it, but it's not working. What's wrong with this code?
char *p;
*p = malloc(10); (6 + 4 = 10 marks)

Section C : Applied Theory (20 Marks)
6.

a. Write a C Program to read student records from a binary file and to display them on screen.
b. Write a C program to sort ‘n’ books based on book-id using structures?
(The elements of structure are book-id, title, author and price)

c. Explain briefly on nested structures? (10 + 5 + 5 = 20 marks)

Suggested Answers

1.
Answer : (c)
Reason: The x and y are called as formal parameters according to the definition of function.
2.
Answer : (b)
Reason: C variable is local to the function that is why it is called to local variable.
3.
Answer : (d)
Reason: Function prototype is the declaration of the structure of function.
4.
Answer : (b)
Reason: No return type is mentioned
5.
Answer : (a)
Reason: The other parameter is address parameter.
6.
Answer : (a)
Reason: Dennis Ritchie developed C language.
7.
Answer : (d)
Reason: The definition of constant says that it cant be changed.
8.
Answer : (c)
Reason: Enumeration types minimize complexity.
9.
Answer : (c)
Reason: First * is evaluated and next / is evaluated and then + or + evaluated.so 40 is the right choice.
10.
Answer : (b)
Reason: String occupies one character as null.
11.
Answer : (d)
Reason: 14 is the right choice after the execution of program.
12.
Answer : (d)
Reason: First x becomes 5 and then x gets added to 2 and result is 7.
13.
Answer : (b)
Reason:
Header file contains the function prototypes for the standard input /output library functions and information used by them.
14.
Answer : (c)
Reason: Function prototype is the declaration statement in the calling program.
15.
Answer : (b)
Reason: The value of i wll be 28 after execution of the code.
16.
Answer : (c)
Reason: 3 matches the case :3 and C will be printed.
17.
Answer : (c)
Reason: C is the right choice according to the statement .
18.
Answer : (c)
Reason: Float occupies 4 bytes so total 8 bytes .
19.
Answer : (d)
Reason: D is the right choice based on the recursive call.
20.
Answer : (d)
Reason: Reasongetchr()function reads the character from the key board.
21.
Answer : (d)
Reason: File is a structure.
22.
Answer : (d)
Reason: Multiline macros can be defined using \.
23.
Answer : (b)
Reason: The code associated with a function is expanded in line.
24.
Answer : (d)
Reason: First m is incremented and then y is initialized.
25.
Answer : (a)
Reason: For variable the default storage class is auto.
26.
Answer : (a)
Reason: In mixedmode expressions Operands of lower type get automatically converted to higher type.
27.
Answer : (c)
Reason: Garbage value will be set if an array is not initialized.
28.
Answer : (c)
Reason: The last element in the string is null character.
29.
Answer : (d)
Reason: Unformatted data files uses fread and fwrite.
30.
Answer : (c)
Reason: “stringzizing operator is # .