dynamic vs static scoping...
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Thread: dynamic vs static scoping...

  1. #1
    Join Date
    Aug 2007
    Posts
    28

    Exclamation dynamic vs static scoping...

    hey everyone.. i am trying to understand the difference between dinamic and static scoping...

    can someone please explain me this short problem and what would be the results..
    Code:
          int a = 27;
    
              f() {
                int a = 32;
                g();
              }
    
              g() {
                 print a;
                 {
                   int a = 99;
                   h();
                 }
              }
    
              h() { print a; }
    
              print a;
              f();
              g();
              h();
    what i mean is what would be the output of the above program using static scope and the output using dynamic scop, assuming that each invocation of print a prints the value of a on a separate line.


    also.. is it true that dynamic scope is used in most popular programming languages??

  2. #2
    Join Date
    Dec 2006
    Posts
    166

    Re: dynamic vs static scoping...

    static scope would output
    27
    27
    27
    27
    27
    27
    dynamic scope would output
    27
    32
    99
    27
    99
    27

    basically all languages that are still used today use static scope, because dynamic scope is very difficult to reason about
    some ideas of dynamic scope are used in object-oriented programming with dynamic binding of virtual methods

  3. #3
    Join Date
    Aug 2007
    Posts
    28

    Thumbs up Re: dynamic vs static scoping...

    Quote Originally Posted by spoon!
    static scope would output
    27
    27
    27
    27
    27
    27
    dynamic scope would output
    27
    32
    99
    27
    99
    27

    basically all languages that are still used today use static scope, because dynamic scope is very difficult to reason about
    some ideas of dynamic scope are used in object-oriented programming with dynamic binding of virtual methods

    thank you soooo much

  4. #4
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    Re: dynamic vs static scoping...

    Don't get that...

    F() doesn't PRINT anything
    David

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  5. #5
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    Re: dynamic vs static scoping...

    Quote Originally Posted by dglienna
    Don't get that...

    F() doesn't PRINT anything
    it calls g function... did you find a mistake in other guy's answer?

  6. #6
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    Re: dynamic vs static scoping...

    I don't see 6 Print statements
    David

    CodeGuru Article: Bound Controls are Evil-VB6
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  7. #7
    Join Date
    Dec 2006
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    166

    Re: dynamic vs static scoping...

    1. there is a print before f is called
    2. g prints
    3. h prints
    4. g prints
    5. h prints
    6. h prints

  8. #8
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    Re: dynamic vs static scoping...

    Oh. I see now. Thanks.
    David

    CodeGuru Article: Bound Controls are Evil-VB6
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