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Question

  • 14-05-2006 11:55pm
    #1
    Creamy Goodness
    Registered Users, Registered Users 2 Posts: 26,584 ✭✭✭✭


    okay supposidly (spelling) we have meant to have covered this topic in my maths class (dispite not one person remembering doing it)

    anyways this question appeared on an exam and i hadn't a clue how to do it.

    i tried researching it in books and on the net but can't find anything on it's topic, probably would help if i knew what the particular type of maths was called.

    so here's the Q.

    What is the value of x after each of these statements is encounterd in a computer program, if x = 2 before the statement is reached.

    (i) if (7 + 2 = 8) then x := x + 1

    (ii) if ((2 + 4 = 7) OR (2 + 3 = 3)) then x := x + 1

    (iii) if ((2 + 4 = 7) AND (4 + 5 = 9)) then x := x + 1


    does anyone know what i should be doing?

    Thanks for your help in advance.


Comments

  • #2
    Pherekydes
    Registered Users, Registered Users 2 Posts: 16,201 ✭✭✭✭Pherekydes


    (i) if (7 + 2 = 8) then x := x + 1

    If the statement in the bracket is true, then increment x.

    (ii) if ((2 + 4 = 7) OR (2 + 3 = 3)) then x := x + 1

    If either of the statements in the brackets are true then increment x.

    (iii) if ((2 + 4 = 7) AND (4 + 5 = 9)) then x := x + 1

    If both of the statements in the brackets are true, then increment x.


    Answers: (i) The statement is not true, x=2 (i.e. x is not incremented)

    (ii) Neither of the statements are true, x=2

    (iii) Both of the statements are not true (one is, one isn't), x=2


  • #3
    Creamy Goodness
    Registered Users, Registered Users 2 Posts: 26,584 ✭✭✭✭Creamy Goodness


    cheers that what i thought it was but just wanted to make sure, thanks for the reply.


  • #4
    Sean^DCT4
    Registered Users, Registered Users 2 Posts: 527 ✭✭✭Sean^DCT4


    Slow coach wrote:
    (i) if (7 + 2 = 8) then x := x + 1

    If the statement in the bracket is true, then increment x.

    (ii) if ((2 + 4 = 7) OR (2 + 3 = 3)) then x := x + 1

    If either of the statements in the brackets are true then increment x.

    (iii) if ((2 + 4 = 7) AND (4 + 5 = 9)) then x := x + 1

    If both of the statements in the brackets are true, then increment x.


    Answers: (i) The statement is not true, x=2 (i.e. x is not incremented)

    (ii) Neither of the statements are true, x=2

    (iii) Both of the statements are not true (one is, one isn't), x=2
    It's very simple computer program notation.. But is this not some form of Math Logic, i.e. Propositional / Predicate logic ?

    Should the answer not be shown as True/False/Imply... Following the Truth-tables?
    i. F -> F
    ii. F V F -> F (V=or)
    iii. F & T -> cant remember off the top of my head but is probably F


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