Popular interview questions asked during technical interview for C programmers.

2. Q.1: What is C language
in your opinion?

3.  Developed by Dennis Ritchie
between 1969 & 1973.
 Developed at the Bell
Laboratories, aimed to use with
UNIX OS.
 Widely used for developing
application software, though it
was mainly invented for
developing system software.

4. Q.2: What is a static
variable in context of C
language?

5.  Declared inside a function.
 Declared for function name.
 Declared for Global parameters.

6. Q.3: Can you explain the
difference between a
normal variable and a
pointer?

7.  A normal variable can have any value
and can be changed throughout the
length of the program.
 A pointer defines the address where
another variable is stored and not any
value.

8. Q.4: What is the
difference
between calloc() and
malloc()?

9.  malloc() will create single block of memory of
size specified by the user.
 Example - p=(int*)malloc(sizeof(int)*5)
 calloc() takes two arguments and zero initializes
the memory. It can assign multiple blocks of
memory for a variable.
 Example - p=(int*)calloc(5,sizeof(int)*5)

10. Q.5: What is the
difference between printf()
and sprint()?

11.  Printf() outputs the data to the standard
output device which is usually the
computer monitor.
 Sprint() outputs the data to a character
array.

12. Q.6: Which is the fastest
sorting method you can
use while programming in
c language?

13. This is a question which falls into “There is no
one-size-fits-all answer” category. But few
options are-
 Quick sort.
 Radix sort.
 Merge sort.

14. Q.7: Is using functions or
macros better when
programming in C?

15.  Macros are generally more efficient and
faster.
 Macros cannot handle complex programming
constructs and in such cases functions are
used
 We can choose macros or functions based on
our priority - speed vs. size of program.

16. Q.8: What is a Stack?

17.  Stack is where information required to call
and return function resides
 It also stores a functions local variable
 Stack follows a FIFO model

18. Q.9: What is the
difference between C and
C++?

19.  C++ is an advanced version of C which
introduced a lot of new features like
classes and so on.
 It’s much more object oriented compared to
the general purpose programming C was
initially created for.

20. Q.10: Is it good to use
goto statement?

21.  goto statements are used to implement a
local jump during program execution.
 It is not considered a good practice to use
goto statements and should be avoided as
much as possible.

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