top 100 c questions asked in actual interviews

8/8/2019 Top 100 C Questions Asked in Actual Interviews

1/16

Top 100 C Questions Asked in ActualInterviews

Difference between arrays and

pointers?http://www.coolinterview.com/interview/9

60

What is the purpose ofrealloc( )?

http://www.coolinterview.com/interview/9

61

What is static memory allocation anddynamic memory allocation?


62

How are pointer variables initialized?


63

Are pointers integers?


64

What is a pointer variable?


65

What is a pointer value and address?


66
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2/16

What is a method?


67

What arethe advantages of thefunctions?


68

What is the purpose of main( )function?


What is an argument ? differentiatebetween formal arguments andactualarguments?


70 What is a function and built-in

function?


71

What is modular programming?


When does the compiler not implicitlygenerate the address of the first
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3/16

elementofan array?


73

What are the characteristics of arraysin C?


74

Differentiate between a linker andlinkage?


What are advantages anddisadvantages of external storageclass?


76 Diffenentiate between an internal

static and external static variable?


77

What are the advantages of auto

variables?http://www.coolinterview.com/interview/9

78

What is storage class and what are
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4/16

storage variable ?


79

Which expression always return true?Which always return false?


80

Write the equivalent expression for x%8?


why n++ executes faster than n+1?


82

what is a modulus operator? What

are the restrictions of a modulusoperator?


83

What is the difference between astring and an array?


Is it better to use a pointer tonavigate an array of values,or is it
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5/16

better to use a subscripted arrayname?


85

Can the sizeof operator be used to tellthe size of an array passed toa

function?


86

Is using exit() the same as usingreturn?


87

Is it possible to execute code even

after the program exits the main()

function?http://www.coolinterview.com/interview/9

88

What is a static function?


89

Why should I prototype a function?http://www.coolinterview.com/interview/9

90

How do you print an address?
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6/16


91

Can math operations be performed ona void pointer?


92

How can you determine the size of an

allocated portion of memory?


93

What is a"null pointer assignment"

error? What are bus errors, memoryfaults, and core dumps?


94

What is thedifference between NULLand NUL?


95

What is theheap?


96

Can the size of an array be declared

at runtime?

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7/16

97

What is the stack?


When should a far pointer be used?


99

What is the difference between far

and near?http://www.coolinterview.com/interview/1

000

Is it better to use malloc() orcalloc()?


001

Why should we assign NULL to theelements (pointer) after freeing

them?


002

When would you use a pointer to a

function?

http://www.coolinterview.com

/interview/1003

How do you use a pointer to a
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8/16

function?


004

Canyou add pointers together? Whywould you?


005

What does it mean when a pointer isused in an if statement?


Is NULL always defined as 0?


007

What is a void pointer?


What is a null pointer?


009

How many levels of pointers can you

have?


010

What is indirection?
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9/16


011

How do you print only part of astring?


012

How canI convert a string to a

number?


013

How canI convert a number to a

string?


014

What is the difference between a

string copy (strcpy) and a memorycopy (memcpy)? When should eachbe used?


015

How can you check to see whether a

symbol is defined?http://www.coolinterview.com/interview/1

016

How do you override a defined
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10/16

macro?


017

What is #line used for?


018

What is a pragma?


019

What are the standard predefinedmacros?


020

How can type-insensitive macros becreated?


How many levels deep can includefiles be nested?


022

Caninclude files be nested?


023

Can you define which header file to
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11/16

include at compile time?


024

What is the difference between#include and #include "file"?


025

Is it better to use a macro or afunction?


How are portions of a programdisabled in demo versions?


027

What is the benefit of using an enumrather than a #define constant?


028

What is the benefit of using #defineto declare a constant?


Can a file other than a .h file beincluded with #include?
http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1030http://www.coolinterview.com/interview/1030http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1024http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1025http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1026http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1027http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1028http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1029http://www.coolinterview.com/interview/1030http://www.coolinterview.com/interview/1030


12/16


030

How can you avoid including a headermore than once?


031

What will the preprocessor do for a

program?


032

What is a macro, and how do you use

it?


033

What is Preprocessor?


How can I make sure that myprogram is the only one accessing a

file?


035

How can I open a file so that other

programs can update it at the sametime?
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13/16


036

How do you determine whether touse a stream function or a low-levelfunction?


037

What is the difference between textand binary modes?


How can you restore a redirectedstandard stream?


039

How do you redirect a standardstream?


040

How can I search for data in a linkedlist?


How can I sort a linked list?

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14/16

042

What is hashing?


What is the quickest searching

method to use?


044

What is the easiest searching methodto use?


045

How can I sort things that are too

large to bring into memory?


046

What is the quickest sorting method

to use?


047

What is the easiest sorting method to

use?

http://www.coolinterview.com

/interview/1048

What is the benefit of using const for
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15/16

declaring constants?


049

Canstatic variables bedeclared in aheader file?


050

Whatis the difference betweendeclaring a variable and defining a

variable?http://www.coolinterview.com/interview/1

051

Is it acceptable to declare/define avariable in a C header?


052 When should a type cast not be used?


053

When should a type cast be used?


054

How can you determine the maximum

value that a numeric variable canhold?
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16/16


055

How reliable are floating-pointcomparisons?


056

Cana variable be both const and

volatile?


057

when should the volatile modifier be

used?


058

When should the register modifier beused? Does it really help?


059
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top 100 c questions asked in actual interviews

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