This document contains information about the Introduction to C Programming course at Dhanalakshmi College of Engineering. It includes 20 multiple choice questions about C programming concepts like data types, variables, operators, input/output statements, decision making statements, and loops. Sample code is provided to demonstrate various C programming constructs like if/else statements, while loops, and functions.

1. OCS752 − Introduction to C Programming VII Semester EEE
Dept. of CSE Dhanalakshmi College of Engineering 1
DHANALAKSHMI COLLEGE OF ENGINEERING
Tambaram, Chennai
Department of Computer Science and Engineering
OCS752 INTRODUCTION TO C PROGRAMMING
Year / Sem : IV / VII
2 Marks Q & A

2. OCS752 − Introduction to C Programming VII Semester EEE
Dept. of CSE Dhanalakshmi College of Engineering 2
UNIT – I
INTRODUCTION
Structure of C program – Basics: Data Types – Constants – Variables – Keywords – Operators –
Precedence and Associativity – Expressions – Input/Output statements – Assignment statements –
Decision making statements – Switch statement – Looping statements – Pre processor directives –
Compilation process – Exercise programs: Check whether the required amount can be withdrawn based
on the available amount – Menu-driven program to find the area of different shapes – Find the sum of
even numbers
PART – A
1. What are the different data types in C? (A/M – 14, N/D – 16)
Data types in C
1) Character
2) Integer
3) Floating point
4) Double
2. What are Keywords? (A/M – 15)
Keywords are reserved words with a predefined meaning. Keywords are part of the syntax and they
cannot be used as an identifier.
Example: int money;
Here, int is a keyword and money is a variable of type int (integer).
3. List the various input and output statements in C. (A/M – 15, N/D – 15)
Various input and output statements in C
1) Formatted input statement
2) Unformatted input statement
3) Formatted output statement
4) Unformatted output statement
4. What is a variable? Give example. (N/D – 14, A/M – 16)
Variable is a named location in memory where a program can manipulate the data. This location is used
to hold the value of a variable.
Syntax: data_type variable_name = value;
Example: int x = 50, char flag = ‘x’;

3. OCS752 − Introduction to C Programming VII Semester EEE
Dept. of CSE Dhanalakshmi College of Engineering 3
5. Distinguish between Local variable and Global variable in C.
S. No. Local variable Global variable
1 Local variables are declared inside a function.
Global variables are declared outside a
function.
2
Local variables are recreated when a function
is called.
Global variables are not recreated when a
function is called.
3
Example
main()
{
int local =10; // Local variable
printf(“Local variable = %d”,local);
}
Example
int global=5; // Global variable
main()
{
printf(“Global variable = %d”,global);
}
6. Differentiate unformatted input/output statement from formatted input/output statement.
(A/M – 19)
S. No. Unformatted input/output statement Formatted input/output statement
1 Unformatted input/output transfers the
internal binary representation of the data
directly between memory and file.
Formatted input/output converts the
internal binary representation of the data to
ASCII characters which are written to the
output file.
2
Unformatted input/output statements are
getchar(), putchar(), getch(), putch(), gets()
and puts().
Formatted input/output statements are
scanf( ), fscanf(), printf() and fprintf().
3
Example
#include<stdio.h>
void main()
{
char ch;
ch = getch();
putch(ch);
}
Example
#include<stdio.h>
void main()
{
int a;
scanf(“%d”,&a);
printf(“number=%d”,a);
}
7. What are constants in C? Mention its types. (A/M – 17)
The constants refer to fixed values whose values do not change during its execution. These fixed values
are also called literals.

4. OCS752 − Introduction to C Programming VII Semester EEE
Dept. of CSE Dhanalakshmi College of Engineering 4
Types of constant
1) Integer constant
2) Floating point constant
3) Character constant
4) String constant
Example
const int LENGTH = 10;
8. What is the use of external storage class? (A/M – 18)
External storage class is used when we have global functions or variables which are shared between two
or more files. ‘extern’ is the keyword used to implement external storage class. Extern stands for external
storage class.
Example
extern int a=10;
9. Distinguish between Break statement and Continue statement. (N/D – 19)
S. No. Break statement Continue statement
1
Break statement is used to terminate the
block and gets the control out of
the switch or loop.
Continue statement is used to get the
control to the next iteration of the loop.
2
Break can appear in both switch and loop
statements.
Continue can appear only in loop
statement.
3
Example
a=0;
while(a>3)
{
if(a==2)
break;
a++;
}
Example
a=0;
while(a>3)
{
if(a==3)
continue;
a++;
}
10. List the various types of C operators. (N/D – 19)
Various types of C operators
1) Arithmetic operators
2) Relational operators
3) Equality operators
4) Logical operators

5. OCS752 − Introduction to C Programming VII Semester EEE
Dept. of CSE Dhanalakshmi College of Engineering 5
5) Unary operators
6) Assignment operators
7) Comma operators
8) Conditional operator
9) Bitwise operators
10) Sizeof operators
11. What is preprocessor directive? (A/M – 18, A/M – 19)
Preprocessor directive is a macro processor. It is used automatically by the C compiler to transform the
program before actual compilation.
Example
#define max 10
12. Differentiate While statement from Do...While statement. (A/M–16, N/D–17)
S. No. While Do...while
1
Executes the statements within the
while block, if only the condition is
true.
Executes the statements within the while
block at least once, even the condition is
false.
2
The condition is checked at the
starting of the loop.
The condition is checked at the end of the
loop.
3 It is an entry controlled loop. It is an exit controlled loop.
13. List the rules to be followed in naming an identifier. (A/M – 16)
Rules to be followed in naming an identifier
1) First letter should be an alphabet.
2) Numbers and alphabets are permitted.
3) Mixing of lower case and upper case are allowed.
4) No special symbols are permitted except underscore ( _ ).
5) Keywords are not permitted.
14. Write any four escape sequences in C. (A/M – 13)
Escape sequences in C
1) n – new line
2) t – tab
3) a – alert
4) 0 – null

6. OCS752 − Introduction to C Programming VII Semester EEE
Dept. of CSE Dhanalakshmi College of Engineering 6
15. Write a C program to find the sum of even numbers.
#include<stdio.h>
void main()
{
int i, n, sum;
sum = 0;
printf("Enter the Number : ");
scanf("%d",&n);
for(i=1; i<=n; i++)
{
if(i%2==0)
sum=sum+i;
}
printf("Sum of all Even Integers is %d",sum);
}
Output:
Enter the Number : 10
Sum of all Even Integers is 30
16. Mention the various decision making statements in C.
Various decision making statements in C
1) if statement
2) if...else statement
3) nested if statement
4) switch statement
5) nested switch statement
17. Write a note on main() in C.
Every c program must have only one main() function. The program execution starts from main()
function. The empty parenthesis () indicates that the main has no arguments.
18. What is the use of sizeof() operator in C? (N/D – 17)
The sizeof() operator is used to find the amount of memory allocated to a variable. Memory size differs
based on the data type.
Example:
sizeof(char); // it returns1
sizeof(int); // it returns 4
sizeof(float); // it returns 4
sizeof(double); // it returns 8

7. OCS752 − Introduction to C Programming VII Semester EEE
Dept. of CSE Dhanalakshmi College of Engineering 7
19. Define – Compilation
Compilation is defined as the processing of source code files to create an object file. The compiler
produces machine language instructions that correspond to the compiled source code file.
20. List the various input and output statements in C. (A/M – 15)
Various input and output statements in C
1) gets()
2) getch()
3) getchar()
4) scanf()
5) puts()
6) putch()
7) putchar()
8) printf()