Interview Questions for Freashers

Friends i am sharing some c FAQ:

1.What does static variable means?

2.What is a Pointer?

3.What is a Structure?

4.What are the differences between Structures and
Arrays?

5.In header files whether functions are declared or
defined?

6.What are the differences between malloc() and
calloc()?

7.What are Macros? What are its advantages and
disadvantages?

8.Difference between Pass by Value and Pass by
reference?

9.What is static identifier?

10.Where is the auto variables stored?

11.Where does global, static, local, register
variables, free memory and C program instructions get
stored?

12.Difference between arrays and linked list?

13.What are enumerations?

14.Describe about storage allocation and scope of
global, extern, static, local and register variables?

15.What are register variables? What are the
advantages of using it?
16.What is the use of typedef?
17.Can we specify variable field width in a scanf()
format string? If possible, how?
18.Out of fgets() and gets(), which function is safe
to use and Why?
19.Difference between strdup and strcpy?
20.What is recursion?
21.Differentiate between a FOR loop and a WHILE loop?
What are its uses?
22.What are the different storage classes in C?
23.Write down the equivalent pointer expression for
referring the same element a[i][j][k][l]?
24.What is the difference between Structure and
Unions?
25.What are the advantages of using Unions?
26.What are the advantages of using pointers in a
program?
27.What is the difference between Strings and Arrays?
28.What is a far pointer? Where we use it?
29.How will you declare an array of three function
pointers where each function receives two int and
returns a float?
30.What is NULL pointer? Whether it is same as an
un-initialized pointer?
31.What is a NULL macro? What is the difference
between a NULL pointer and a NULL macro?
32.What does the error ‘Null Pointer Assignment’ means
and what causes this error?
33.What is near, far and huge pointers? How many bytes
are occupied by them?
34.How would you obtain segment and offset addresses
from a far address of a memory location?
35.Are the expressions arr and &arr same for an array
of integers?
36.Does mentioning the array name gives the base
address in all the contexts?
37.Explain one method to process an entire string as
one unit?
38.What is the similarity between a Structure, Union
and Enumeration?
39.Can a Structure contain a Pointer to itself?
40.How can we check whether the contents of two
structure variables are same or not?
41.How are Structure passing and returning implemented
by the compiler?
42.How can we read/write Structures from/to data
files?
43.What is the difference between an enumeration and a
set of pre-processor # defines?
44.What do the ‘c’ and ‘v’ in argc and argv stand for?
45.What is the maximum combined length of command line
arguments including the space between adjacent
arguments?
46.If we want that any wildcard characters in the
command line arguments should be appropriately
expanded, are we required to make any special
provision? If yes, which?
47.Does there exist any way to make the command line
arguments available to other functions without passing
them as arguments to the function?
48.What are bit fields?
49.What is the use of bit fields in a Structure
declaration?
50.To which numbering system can the binary number
1101100100111100 be easily converted to?
51.Which bit wise operator is suitable for checking
whether a particular bit is on or off?
52.Which bit wise operator is suitable for turning off
a particular bit in a number?
53.Which bit wise operator is suitable for putting on
a particular bit in a number?
54.Which one is equivalent to multiplying by 2: Left
shifting a number by 1 or Left shifting an unsigned
int or char by 1?
55.Write a program to compare two strings without
using the strcmp() function?
56.Write a program to concatenate two strings?
57.Write a program to interchange 2 variables without
using the third one?
58.Write a program for String Reversal?
59.Write a program for Palindrome check?
60.Write a program to find the Factorial of a number?
61.Write a program to generate Fibonacci series?
62.Write a program which employs Recursion?
63.Write a program which uses Command Line Arguments?
64.Write a program which uses functions like strcmp(),
strcpy(), etc.?
65.What are the advantages of using typedef in a
program?
66.How would you dynamically allocate a
one-dimensional and two-dimensional array of integers?
67.When reallocating memory if nay other pointers
point the same piece of memory, do you have to
readjust these other pointers or do they get
readjusted automatically?
68.Which function should be used to free the memory
allocated by calloc()?
69.How much maximum can you allocate in a single call
to malloc()?
70.Can you dynamically allocate arrays in expanded
memory?
71.What is object file? How can you access object
file?
72.Which header file should include if you are to
develop a function which can accept variable number of
arguments?
73.Can you write a function similar to printf()?
74.How can a called function determine the number of
arguments that have been passed to it?
75.Can there be at least some solution to determine
the number of arguments passed to a variable argument
list function?
76.How do you declare, An array of three pointers to
chars?
77.How do you declare, An array of three char
pointers?
78.How do you declare, A pointer to array of three
chars?
79.How do you declare, A pointer to function which
receives an int pointer and returns a float pointer?
80.How do you declare, A pointer to a function which
receives nothing and returns nothing?
81.What do the functions atoi(), itoa() and gcvt() do?
82.Does there exist any other function which can be
used to convert an integer or a float to a string?
83.How would you use qsort() function to sort an array
of structures?
84.How would you use qsort() function to sort the name
stored in an array of pointers to string?
85.How would you use bsearch() function to search a
name stored in array of pointers to string?
86.How would you use the functions sin(), pow(),
sqrt()?
87.How would you use the functions memcpy(), memset(),
memmove()?
88.How would you use the functions fseek(), fread(),
fwrite() and ftell()?
89.How would you use the functions randomize() and
random()?
90.How would you obtain current time and difference
between two times?
91.How would you implement a substr() function that
extracts a sub string from a given string?
92.What is the difference between the functions
rand(), random(), srand() and randomize()?
93.What is the difference between the functions
memmove() and memcpy()?
94.How do you print a string on the printer?
95.Can you use the function fprintf() to display the
output on the screen?
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