Help Desk for Class XI July Test dated 27.07.12

As we all know July Test for XI CS is scheduled on 27.07.12. To help students on their doubts for above said test, we have started this helpdesk.

Please comment to ask your questions. Please allow 1-2 hours to us for reply.


Students can also contact concerned teachers tomorrow at school but only with prior information over phone.

Best of luck!

NOTE: THIS BLOG IS RUN BY EXPERTS OF SUBJECT AND YOUR QUERIES WILL GET BEST REPLIES HERE AND ALSO PROVIDE FASTER RESOLUTIONS.

THIS HELPDESK IS DISCONTINUED FROM 9:30 PM IST 26.07.12
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20 comments:

  1. supreet25 July 2012 at 23:35

    Please tell me what do we need to know about the major computers like ENIAC etc? I mean details like fullform, major features,.. What else?

    ReplyDelete
    Replies
    1. Quadd Advertisements26 July 2012 at 02:35

      These old computers are part of Computer Generations, cover these as examples of generations only.

      Delete
    2. supreet26 July 2012 at 04:57

      ok In this expression : a + b * c / d
      as division and multiplication are performed before addition 'b' will be multiplied by 'c' before 'c' is divided by 'd' then what is the next step?
      The value obtained after multiplication will be divided by 'd' and after division the value obtained will be be added to 'a'?
      is this the correct way?

      Delete
    3. Quadd Advertisements26 July 2012 at 06:47

      Suppose a = 1, b = 2, c = 3, d = 4

      Then, 1 + 2 * 3 / 4
      Step 1: 1 + 6 / 4
      Step 2: 1 + 1
      Step 3: 2

      Note: 6/4 = 1.5 and this is integer division (or all four variables are of int type that is why it returned 1 instead of 1.5)

      Delete
  2. supreet26 July 2012 at 05:32

    Compiler vs Interpreter
    Which one is best? If we see from the point of view of time taken in execution, then compiler executes much faster than interpreter but if we see this from other point of view like interpreters are much easier to write because they are written in High level languages itself. So, on the whole which one is best?
    And i am having one more question: Are compilers written in 3different languages i.e. source language, target language and implementation language??

    ReplyDelete
    Replies
    1. Quadd Advertisements26 July 2012 at 06:55

      Question is not of speed. Preference in selection of Compiler and Interpreter depends on their working. Both are good that is why both exists till today. Visual basic is Interpreter and C# is compiler.

      If you want line by line check of your program while typing go for interpreter and if you want to check it as a whole before execution then go for compiler.

      Moreover compilers are more popular.

      Source language, target language an implementation language are concepts of multilingual programming. We suggest you to ask question here related to XI test only.

      Thank you!

      Delete
    2. supreet26 July 2012 at 07:05

      ok thanks..!
      I am having problem in this topic C++ Type Conversions - "Casting a value"

      Delete
    3. Quadd Advertisements26 July 2012 at 07:12

      As you are not asking specific questions, we recommend you to read whole concept here.

      This link is based on C language as in class XI type casting is limited to c like type casting.

      Delete
  3. Quadd Advertisements26 July 2012 at 07:39

    sweta chaturbedi via email: What is warm booting and cold booting?


    QUADD RESPONSE: When computer starts it performs hardware check (known as POST Power On Self Test), and such booting is called cold booting and when we reset or restart computer it skips hardware check (just cleans the RAM and reloads OS) it is called Warm booting

    ReplyDelete
  4. Quadd Advertisements26 July 2012 at 07:47

    sweta chaturbedi via email: What is FOSS?

    QUADD RESPONSE: There are basically two types of software: Proprietary (paid software like from Microsoft) and Free Open Source Software (free software which code is also available to change like Linux).

    ReplyDelete
  5. SANYAM JAIN26 July 2012 at 07:51

    what is difference between overflow and underflow of data?

    ReplyDelete
  6. Quadd Advertisements26 July 2012 at 07:51

    sweta chaturbedi via email: Overflow and underflow of data
    related to variables.

    QUADD RESPONSE: Variables have specific range to store values and value more than their range is assigned to them then this is called overflow and when value lower than their lower limit is tried to assign them then it is called underflow (IN CLASS XI UNDERFLOW IS NOT FREQUENT AT THIS LEVEL OF PROGRAMMING)

    ReplyDelete
  7. Unknown26 July 2012 at 08:02

    what is type conversions ?

    ReplyDelete
  8. Unknown26 July 2012 at 08:06

    type conversions related tooperators and expressions

    ReplyDelete
    Replies
    1. Quadd Advertisements26 July 2012 at 08:09

      ITS ALL SAME! (TYPE CONVERSIONS RELATED TO VARIABLES IS THE ONLY TOPIC)

      Delete
  9. Unknown26 July 2012 at 08:13

    basic logical structure related to basic s of computer system

    ReplyDelete
    Replies
    1. Quadd Advertisements26 July 2012 at 08:23

      Block diagram depicting logical structure of computer (five basic operations)

      Delete
  10. Vibhu Gupta26 July 2012 at 08:36

    what is concept of utility software?

    ReplyDelete
    Replies
    1. Quadd Advertisements26 July 2012 at 08:48

      Utility software is system software designed to help analyze, configure, optimize or maintain a computer. A single piece of utility software is usually called a utility or tool. For example: Anti-virus, Backup utilities, Data compression utilities, Disk checkers, Disk cleaners, etc.

      For more info visit: wikipedia

      Delete

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