C Interview Questions
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write a program in c to find out the sum of digits of a number.but here is a condition that compiler sums the value from left to right....not right to left..

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Write a program to maintain student’s record. Record should not be available to any unauthorized user. There are three (3) categories of users. Each user has its own type. It depends upon user’s type that which kind of operations user can perform. Their types and options are mentioned below: 1. Admin (Search Record [by Reg. No or Name], View All Records, Insert New Record, Modify Existing Record) 2. Super Admin (Search Record [by Reg. No or Name], View All Records, Insert New Record, Modify Existing Record, Delete Single Record) 3. Guest (Search Record [by Reg. No or Name], View All Records) When first time program runs, it asks to create accounts. Each user type has only 1 account (which means that there can be maximum 3 accounts). In account creation, following options are required: Login Name: <6-10 alphabets long, should be unique> Password: <6-10 alphabets long, should not display characters when user type> Confirm Password: Account Type: Login Name, Password and Account Type should be stored in a separate file in encrypted form. (Encryption means that actual information should be changed and Decryption means that Encrypted information is changed back to the actual information) If any of the above mentioned requirement(s) does not meet then point out mistake and ask user to specify information again. When Program is launched with already created accounts, it will ask for user name and password to authenticate. On successful authentication, give options according to the user’s type.

667

main() { int i = 10; printf(" %d %d %d \n", ++i, i++, ++i); }

TCS, Vector,

8 14429




c language interview questions & answer

726

What is the difference between realloc() and free()

1 1545

int a=20; int b=30; int c=40; printf("%d%d%d"); what will be the output?

CMC,

5 3830

input any 4 digit number and find the difference of all the digits?

Google,

3 1811

Write an algorithm for implementing insertion and deletion operations in a singly linked list using arrays ?

MNC,

2206




What is the purpose of the following code? Is there any problem with the code? void send(int count, short *to, short *from) { /* count > 0 assumed */ register n = (count + 7) / 8; switch (count % 8) { case 0: do { *to = *from++; case 7: *to = *from++; case 6: *to = *from++; case 5: *to = *from++; case 4: *to = *from++; case 3: *to = *from++; case 2: *to = *from++; case 1: *to = *from++; } while (--n > 0); } }

Google,

986

what is the purpose of the following code, and is there any problem with the code? void fn(long* p1, long* p2) { register int x = *p1; register int y = *p2; x ^= y; y ^= x; x ^= y; *p1 = x; *p2 = y; }

Google,

1 2317

what is the purpose of the code, and is there any problem with the code? int f( int n, int l, int r ) { return (n << l) >> r; }

Google,

2 1642

What is the purpose of the code, and is there any problem with it? unsigned int f( unsigned n ) { return –n & 7; }

Google,

1 1928

what is the purpose of the code, and is there any problem with it. bool f( uint n ) { return (n & (n-1)) == 0; }

Google,

1 1838

what is the purpose of the code, and is there any problem with it. unsigned int v[10]; unsigned int i = 0; while (i < 10) v[i] = i++;

Google,

2 2024

Identify the operators that is not used with pointer a. && b. # c. * d. >>

2 2842


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Un-Answered Questions { C }

write a C program: To search a file any word which starts with ?a?. If the word following this ?a? starts with a vowel.Then replace this ?a? with ?a? with ?an?. redirect with the output onto an output file.The source file and destination file are specified by the user int the command line.

1721


i want to switch my career from quailty assurance engineering to development kindly guide me from which programming language its better for me to start plz refer some courses or certifications too i have an experience of 1.5 yrs in QA field.Kindly guide me

771


write a c program in such a way that if we enter the today date the output should be next day's date.

934


Without Computer networks, Computers will be half the use. Comment.

1001


What is pre-emptive data structure and explain it with example?

2453






‘SAVEPOINT’ and ‘ROLLBACK’ is used in oracle database to secure the data comment. Give suitable examples of each with sql command.

1186


Calculate 1*2*3*____*n using recursive function??

772


#include #include struct stu { int i; char j; }; union uni { int i; char j; }; void main() { int j,k; clrscr(); struct stu s; j=sizeof(s); printf("%d",j); union uni u; k=sizeof(u); printf("%d",k); getch(); } what is value of j and k.

2486


hello freinds next week my interview in reliance,nybody has an idea about it intervew questions..so tell

882


how to execute a program using if else condition and the output should enter number and the number is odd only...

867


I need help with the following lab. Can anyone explain it to me on how to approach this problem. Coding would be great too !!! No busy waiting allowed. Remember that Java monitors are 'signal and continue'. The input data is called the database (DB). In this problem, it consists of a single variable initialized in the main thread, to contain the current time of day in HH:MM:SS:mmm format (mmm is milliseconds) truncated to 3 digits. Threads follow these rules: 1. Readers may all attempt to read at the same time, but NOT if a writer is writing (i.e.; the writer is in the monitor. 2. Writing is exclusive (only 1 writer at a time, no readers while writing). 3. Options: (to be specified by instructor) a. Readers have absolute priority over writers. b. Writers have absolute priority over readers c. When a reader arrives and a writer is waiting, the reader is suspended behind the writer instead of being admitted immediately. Thus, a writer waits for readers that were running when it arrived, but does not to wait for new readers. You may program this in C++ or Java. There are 4 controlling input values: 1. r – number of readers 2. w – number of writers 3. R – delay for a reader to restart 4. W – delay for a writer to restart Create the following program consisting of 1 main process (your main program) with n threads: 1. The main thread: a. Creates the 'n' threads needed. Of these, r of them are readers and w of them are writers. Starts all readers and writers. b. Waits for all 'n' threads to complete. You may use any method to detect when they are all complete. c. Prints out the resulting outputs from the threads. 2. Threads: a. When a thread starts to run, it immediately tries to enter the monitor. b. A reader thread reads the DB, outputs the exact message below, then exits: >>> DB value read =: HH:MM:SS:mmm by reader number: rr where the underlined text is replaced with actual data. c. A writer thread updates the DB with a new value (from the system time), outputs the exact message below, then exits: *** DB value set to: HH:MM:SS:mmm by writer number: ww where the underlined text is replaced with actual data. d. Each thread accesses the data a total of 10 times, exiting, then re-entering the monitor after each access. Hints: 1. File access *might* not be thread-safe, so you should be prepared to handle this. Read the documentation for the language you are using. 2. Suggested values for delays are: a. If looping, R >=1,000,000 and W>=100,000 b. If using “sleep”, then R=100 ms, W=50 ms. Additional: • Thread output is to ONE file used by ALL threads (so you need to synchronize access to it). • Readers must provide sufficient delay that results are useful (delay by R before re-trying). R is another input value. • Writers must also delay. Delay by W, updating the DB each time. W is an input. • Test your program with AT LEAST TWO different sets of values for r and w (#s of readers and writers) plus this set: r = 4, w=2. Basic operation of a thread: attempt to enter the monitor. If unsuccessful, you get put on a queue. When you get in, read or write the data (depending on type of thread), exit the monitor, wait the required delay amount, then try again. Repeat 10 times.

744


while initialization of array why we use a[][2] why not a[2][]...?

1148


Explain with the aid of an example why arrays of structures don’t provide an efficient representation when it comes to adding and deleting records internal to the array.

1735


If a five digit number is input through the keyboard, write a program to print a new number by adding one to each of its digits.For example if the number that is input is 12391 then the output should be displayed as 23402

1934


write a program to create a sparse matrix using dynamic memory allocation.

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