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C Interview Questions & Answers - Learning Mode

C Interview Questions & Answers - Learning Mode

C is a high-level and general purpose programming language that is ideal for developing firmware or portable applications. Originally intended for writing system software, C was developed at Bell Labs by Dennis Ritchie for the Unix Operating System (OS) in the early 1970s. With the increasing popularity of object-oriented programming, C is being rapidly replaced as "the" programming language by C++, a superset of the C language that uses an entirely different set of programming concepts, and by Java, a language similar to but simpler than C++, that was designed for use in distributed networks.

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Arrays in C Interview Questions & Answers (18) Learning Mode | Exam Mode

Branches & Loops in C Interview Questions & Answers (22) Learning Mode | Exam Mode

C Basics Interview Questions & Answers (92) Learning Mode | Exam Mode

Dynamic Memory Allocation in C Interview Questions & Answers (21) Learning Mode | Exam Mode

File Operations in C Interview Questions & Answers (16) Learning Mode | Exam Mode

Functions in C Interview Questions & Answers (59) Learning Mode | Exam Mode

Operators in C Interview Questions & Answers (22) Learning Mode | Exam Mode

Pointers in C Interview Questions & Answers (43) Learning Mode | Exam Mode

Strings in C Interview Questions & Answers (32) Learning Mode | Exam Mode

Structures in C Interview Questions & Answers (39) Learning Mode | Exam Mode

Variables in C Interview Questions & Answers (39) Learning Mode | Exam Mode

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C Interview Questions & Answers - Learning Mode
Try C Interview Questions & Answers - Exam Mode
Question: void main()
float a= 0.7;
if (a < 0.7)
Output of the above program is c. Why? Whereas the same program with 0.8 instead of 0.7 gives c++ as the output? Why explain?

Answer: If you give value greater than .7 then it will go 2 the else part because .8 is not less than .7 Source:
Question: main()
extern int i;

Answer: Linker Error : Undefined symbol '_i'
extern storage class in the following declaration,
extern int i;
specifies to the compiler that the memory for i is allocated in some other program and that address will be given to the current program at the time of linking. But linker finds that no other variable of name i is available in any other program with memory space allocated for it. Hence a linker error has occurred .

Question: What is page thrashing?

Answer: Some operating systems (such as UNIX or Windows in enhanced mode) use virtual memory. Virtual
memory is a technique for making a machine behave as if it had more memory than it really has, by using disk space to simulate RAM (random-access memory). In the 80386 and higher Intel CPU chips, and in most other modern microprocessors (such as the Motorola 68030, Sparc, and Power PC), exists a piece of hardware called the Memory Management Unit, or MMU.

The MMU treats memory as if it were co Source:
Question: Write a program to remove comment lines and blank lines from an error free c program.


void main()
FILE *a,*b;
char fname[20],ch,tch=NULL;
int flag1=0,flag=0,count=0;
printf("Enter the file name (.C or .TXT)
a=fopen(fnam Source:
Question: How to find GCD of four numbers?

Answer: Take 4 numbers.The smallest number has to be found out.Then divide each number by that numbers which are less than that smallest number.
so divide each numbers by 1,2,3,4,5.
The GCD will be that number which divides all the number.(here 5) Source:
Question: To which numbering system can the binary number 1101100100111100 be easily converted to?

Answer: Since this is a 16 bit number,
we can group these bits into 4bits a group each as
Hence the given set of bits can be converted to HEXA DECIMAL SYSTEM
16 Source:
Question: main()
if (!(1&&0))
printf("OK I am done.");
printf("OK I am gone.");

Answer: OK I am done
Question: What are enumerations?

Answer: enumerations is one type of user defined data type Source:
Question: When should a type cast be used?

Answer: There are two situations in which to use a type cast. The first use is to change the type of an operand to an arithmetic operation so that the operation will be performed properly.

The second case is to cast pointer types to and from void * in order to interface with functions that expect or return void pointers. For example, the following line type casts the return value of the call to malloc() to be a pointer to a foo structure.

struct foo *p = (struct foo *) malloc(sizeof(struc Source:
Question: #define SQR(x) x * x
printf("%d", 225/SQR(15));

Answer: Use typical C coding guidelines and use

#define SQR(x) ((x) * (x))

And you get the desired answer: 1

Question: How to find size of an datatype without using sizeof operator?

Answer: This should return the size of the datatype without using sizeof()

datatype x;

size = (&x - (&x +1)) Source:
Question: main()
int i=5;

Answer: Answer:<br>45545<br>Explanation:<br>The arguments in a function call are pushed into the stack from left to right. The evaluation is by popping out from the stack. and the evaluation is from right to left, hence the result.<br><br> Source:
Question: main()
char *p;
printf("%d %d ",sizeof(*p),sizeof(p));

Answer: Ans :1,2 because the *p is the pointer varible but the type is character.p is apointer variable.

Question: When should the register modifier be used? Does it really help?

Answer: The register modifier hints to the compiler that the variable will be heavily used and should be kept in the CPU?s registers, if possible, so that it can be accessed faster.

There are several restrictions on the use of the register modifier.

First, the variable must be of a type that can be held in the CPU?s register. This usually means a single value of a size less than or equal to the size of an integer. Some machines have registers that can hold floating-point numbers as well. Source:
Question: If the following program (myprog) is run from the command line as myprog monday tuesday wednesday thursday
What would be the output?

main(int argc, char *argv[])
while(--argc >0)

Answer: B, it will print "mondaytuesdaywednesdaythursday" Source:
Question: #include<conio.h>
int x,y=2,z,a;
if(x=y%2) z=2;
printf("%d %d ",z,x);

Answer: Answer:
Garbage-value 0
The value of y%2 is 0. This value is assigned to x. The condition reduces to if (x) or in other words if(0) and so z goes uninitialized.
Thumb Rule: Check all control paths to write bug free code.

Question: What will be the output of the following program in UNIX OS with CC compiler and TC compiler?

int main()
int i=5;
printf(" %d",++i + ++i + ++i + ++i + ++i );
If any difference then Why it is difference?


Output: 41.

For different compiler ther will be same output.

Expression will be evaluated in following manner.
(((++i + ++i) + ++i) + ++i) + ++i
7 + 7 = 14
14 + 8 = 22
22 + 9 = 31
31 + 10 = 41.

Question: What is a default TCP/IP socket assigned for SQL Server?

Question: What is difference between the test effort and the test procedure?

Answer: Both are different concepts. Test effort defines how much time required to execute a particular test case. Test procedure defines the required actions to execute that test case.
Question: When does the compiler not implicitly generate the address of the first element of an array ?

Answer: Whenever an array name appears in an expression such as
array as an operand of the sizeof operator
array as an operand of & operator
array as a string literal initializer for a character array.
Then the compiler does not implicitly generate the address of the address of the first element of an array.


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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
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