What is memcpy() function?

0 Answers  

---

How to print all the 26 alphabets in this order in C. AbCdEfGh..... it should print dynamically from a to z and do not print this using pgm like this print("Ab......"); Use loops or anything to print all alphabets

2 Answers   Hexaware,

---

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..

1 Answers  

---

write a function that accepts an integer/char array and an search item.If the search item is there in the array return position of array and value else return -1.without using other array,without sorting,not to use more than one loop?

3 Answers   Mind Tree,

---

main() { char p[] = "hello world!"; p = "vector"; printf("%s",p); }

2 Answers   Vector, Vector India,

---

Once I have used freopen, how can I get the original stdout (or stdin) back?

0 Answers  

---

Which of the following about the C comments is incorrect ? a.commentscan go over multiple lines b.comments can start any where in the line c.a line can contain comments with out any language statements d.comments can occur within comments

6 Answers   TCS,

---

Why do we use c for the speed of light?

0 Answers  

---

What should not contain a header file?

2 Answers  

---

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.

0 Answers  

---

What are header files why are they important?

0 Answers  

---

Taking an example,differentiate b/w loader and linker ?

1 Answers  

---