MCDC

55
  1. What is MCDC ?
  Ans:
Modified Condition/Decision Coverage – Every point of entry and exit in the program has been invoked at least once, every condition in a decision in the program has taken all possible outcomes at least once, every decision in the program has taken all possible outcomes at least once, and each condition in a decision has been shown to independently affect.

 

2. What is Condition?
Ans:
       A Boolean expression containing no Boolean operators.

 

3. What is Decision?
Ans :
        A Boolean expression composed of conditions and zero or more Boolean operators. A decision without a Boolean operator is a condition. If a condition appears more than once in a decision, each occurrence is a distinct condition.
MCDC Examples :
 
1. MCDC for A||(B&&C)
Ans:

 

2. MCDC for A&&(B||C)
Ans:

 

3. MCDC for (A||B)&&(C||D)
Ans :

 

4. MCDC for (A&&B)||(C&&D) 
Ans:

 

5. MCDC for (A&&B)||(C||D) 
Ans :

 

6. MCDC for (A&&B)&&(C||D) 
Ans : 
6
7. MCDC for ((A&&B)||((!B)&&C) )

Ans :

1

Adds:

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55 Comments

  1. Admin

    hi,
    Please add your suggestions and questions

    Reply
    1. Chandra lal Maharjan

      Can you please tell me how to do mcdc for following expression
      a&&b&&c||d
      and what is difference between( a&&b&&c||d ) and ( ( a&&d ) && ( c||d ) )
      can u please mail mcdc for these expression in er.chandralal@gmail.com

      Reply
      1. Rushikesh Jadhav

        Hello sir I want basic information about MCDC and how to select the 1st row in the test cases.

        Reply
    2. Admin

      Hi Chandralal,
      Brackets () has the highest priority so if you separate the equation with brackets that will be clear picture and easy to understand and easy to write test cases.
      come to your question a&&b&&c||d ,we can write MCDC for this equation also before that we need to know the priority of operators and proceed.

      Reply
      1. Sivateja

        Can I pls tell me how to get after 5sec in MCDC based on delay

        Reply
  2. Anonymous

    Hiii siva
    i have done good job.

    Reply
  3. Anonymous

    helloo siva
    Send me ur mail id.i will send u RTRT tools notes.So u cn also add it in dis blog.

    Reply
  4. Anonymous

    i have send u RTRT notes .u cn check it.

    Reply
    1. Admin

      Hi,
      The first row is just assumption based on that will change the one input and ensure that output is modified based on the changed input.
      I hope answered your question ,please feel free to reply if you have any doubts.

      Reply
  6. swati kumari

    plz send me rtrt notes and interviews question on do178b and mcdc

    Reply
  7. Admin

    Hi Swati Kumari,
    You can find the Interview questions of DO178B and MCDC Related in this blog itself. Still if you have any questions which are not there in this blog please post the questions i'll get you the answers.

    Reply
  8. Radhika Katti

    nd if possible can u expalin the concept of stub in RTRT tool.??

    Reply
  9. surakshith

    briefly tell how to select the first line, wheather it is trial and error method, because for for long boolean expression, it is difficult.

    Reply
    1. admin

      Hi Suri,
      The first row is just assumption based on that will change the one input and ensure that output is modified based on the changed input.
      I hope this answered your question, please feel free to reply if you have doubts.
      Thank You

      Reply
  10. admin

    Will post the same in website soon.
    Thanks.

    Reply
  12. Abhishek

    Hi Can any one tell me what is the MCDC condition for (A&&B)||(B&&C)
    Note: 2nd B is B-BAR
    Please explain me

    Thanks n Regards
    Abhishek

    Reply
  13. admin

    hi Abhishek,

    i have updated the MCDC conditions for (A&&B)||(!B&&C),
    please check and post the doubts if any.
    Please post such questions ,so that it will be useful for all.

    Regards
    Siva

    Reply
    1. Abhishek

      thank u shiva,but i have a doubt in that MCDC condition should change only one input at every single instance.But you changed 2 input

      Reply
      1. admin

        Hi Abhishek,
        i hope your are talking about “!B”. Actually if i change B input automatically !B input get affected (opposite). that’s why i have shown the transition when the B is changing automatically !B also getting change.

        Hope I answered your question.

        Reply
  15. Shruthika

    Hi Sir,
    Can different people have different set of inputs to show independency for each input. Because I was getting different set of combination to prove for the same set of equation

    Reply
    1. admin

      Hi Shruthika,

      Thanks for posting the query!!!
      Each Individual have their own way of proving the MCDC with different combinations, but final moto is to prove the independancy.

      Regards,
      Siva

      Reply
    1. admin

      hi Rajan,

      Please find the MCDC for the (A||B)&&(A||C)

      A C B Expression Output
      false true true true
      false true false false
      false false true false
      true false false true

      Reply
      1. Rajan

        (A||B)&&(A||C)
        by DeMorgan’s Theorem
        => (A+B).(A+C) // ||=> +, &&=> .
        => A.A+A.B+A.C+B.C
        => A+A.B+A.C+B.C // A.A=1
        => A(1+B+C)+B.C // Taking A commonly out
        => A(1+(B+C))+B.C
        => A+B.C // 1+A=A
        => A||(B&&C)
        => A || ( B && C ) O/P
        T F T T
        F F T F
        F T T T
        F T F F

        Reply
    2. Rajan

      (A||B)&&(A||C)
      by DeMorgan’s Theorem
      => (A+B).(A+C) // ||=> +, &&=> .
      => A.A+A.B+A.C+B.C
      => A+A.B+A.C+B.C // A.A=1
      => A(1+B+C)+B.C // Taking A commonly out
      => A(1+(B+C))+B.C
      => A+B.C // 1+A=A
      => A||(B&&C)
      => A || ( B && C ) O/P
      T F T T
      F F T F
      F T T T
      F T F F

      Reply
  17. firoz

    Hi ,
    where do i can download RTRT tool.

    Reply
  18. firoz

    hi
    help me how to download RTRT free version .

    Reply
  20. SIRISHA

    CAN ANY ONE SEND ME THE RTRT NOTES AND DO 178B INTERVIEW QUESTION AND MCDC COVERAGE NOTES

    Reply
    2. admin

      Hi Sirisha,

      You can find all the details of DO178B,RTRT and MCDC in this website itself.

      Reply
  21. Akash Patel

    Do we need to toggle output between test cases? I mean, for two input AND gate, Is it required to add scenario 3 between 2 and 4?
    Scenario 1 : T T -> T
    Scenario 2 : T F -> F
    Scenario 3 : T T -> T
    Scenario 4 : F T -> F
    Is there any case when adding extra scenario just to toggle output
    will be helpful?

    Reply
    1. admin

      Hi Akash,

      it’s purely depends on the project basis, but yes to show the transformation toggling is needed.

      Reply
  22. Hareesh

    Hi
    can anyone send rtrt notes very urgent

    Reply
  23. Raj

    In Mcdc coverage what type of errors will get?

    Reply
  24. Raj

    Template of ptu in rtrt? And write syntax for c=a/b in rtrt.

    Reply
  25. ANKAIAH GADA

    Write test cases If(a>100)and(b<100) then c is true otherwise d is true
    Limits: a is 1-10
    b is 40-100 and c is
    independent

    Reply
    1. ANKAIAH GADA

      If((a&&b||c)&&(d||e)&&f).How many test cases u will write?

      Please explain clearly as early as possible.
      And also
      (A&&B)||(A&&C)
      (A||B)&&(A||C)
      Mcdc coverage also explain clearly please

      Reply
  26. Dinesh

    Can any one send me RTRT NOTES and MCDC like (A&B)//(C bar &D bar). Please share me all MCDC RELATED

    Reply
  27. JAMES

    WHAT IS MASKING MCDC??
    EXPLAIN THE MCDC FOR (A&&B ) || (A&&D)

    Reply
  28. Sowmi

    Hi Siva sir,
    Robustness cases are possible in MCDC or not?
    If possible then please write the MCDC robustness cases for a^b^c..

    Reply
  29. Md Rakibul Islam

    How to choose the first row for MCDC?
    which row shall I take first?
    can you explain please

    Reply
  30. Aru

    What will be the MCDC for (A||B)&&C ??

    Reply

  31. Hi
    how many test cases in A X-OR B gate in MCDC

    Reply

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