c++ - general tbb issue for calculating fibonacci numbers -


I came across a TBB template as an example of work-based programming for calculating Fibonacci numbers in c ++ I am But when I run it I get the value of 1717986912 which can not happen. Production should be 3. What am I doing wrong? 

  Class Fibatas: Public work {public: const long n; Long long * const amount; Execute Execute :: Virtual Function Work Override: (if n & lt; 0) {return 0; } And {long X, Y; FibTask & amp; A = * new (allocate_child ()) FIbtask (N-1, and X); FibTask & amp; B = * new (allocate_child ()) Fibatac (N -2, & y); // Set one for "Wait for another for two children". Set_ref_count (3); // Start B. Moving eggs (B); // Start a race and wait for all children (A and B). Spawn_and_wait_for_all (a); // sum * sum = x + y; } Return tap; } Long parallelfib (long n) {long amount; FibTask & amp; A = * new (task :: allocated_root ()) FIbtask (N, and Yoga); Job: spawn_root_and_wait (a); Refund Amount; }}; Long main (int argc, char ** argv) {Fibcash * obj = new fibatasc (3,0); Long B = obj-> Parallelbb (3); Std :: cout & lt; & Lt; B; Return 0; }   
 
 
 This cutoff has been messed up here. It should be at least 2 eg .:  
  if (n & lt; 2) {* sum = n; Return tap; }   
 The original example also uses serialfib as shown here  
 Inadequate method to calculate Fibonacci numbers using disabled blocking style techniques. Serialfib Will be even more disabled without calling ()  
 WARNING: Please note that the purpose of this example is to display only this special level level TBB API and this is a special way of using it. It does not intend to reuse it, unless you really do not know why you are doing it.   
  Int Fib (int nin) {if (n & lt; cfuf), the modern high level API {// 2 minimum return is Fiberial (N); } And {int x, y; tbb :: parallel_invoke ([& amp;] {x = fib (n-1);}, [& amp;] {y = fib (n -2);}); Return x + y; }}

Comments

Post a Comment

Popular posts from this blog

Java - Error: no suitable method found for add(int, java.lang.String) -

I'm in the middle of homework work and I'm stuck. At this point in my code, I think that I should have a GUI window that opens and allows me to type "inserted text number". Notice is not going anywhere but at this point, If I pass through the problem then it will be in a linked list. I am getting two of the same error for the lines. Add (index, element); And I can not seem to get past it, there is no suitable method for the error "add (int, java. string string)". Code is below, please advise. To clarify - this will not be a method error because it is a linked list. There should not be any way involved. import java.awt. *; Import java.awt.event. *; Import javax.swing. *; Import java.util. *; Import java.util.Scanner; Import java.util.LinkedList; Public class TopTenList JFrame {Private TopTenList tt; See the Private JTextArea list; Private JTextField cmdTextField; Private JTextField resultsTestfield; // This GUI window is the code for the public toptist...
Read more

java - JPA TypedQuery: Parameter value element did not match expected type -

I am using JPA 2.0 and getting the following code in the DAO layer: Public Zero Test () {string key = "status"; String [] Conditions = {"A", "B"}; & Lt; TestTable & gt; Results = Search (Keys, Conditions); } Public listing & lt; TestTable & gt; Search (string key, object value error) {string sql = "test ndf to testlet and jade nand." + Key + "in:" + key; TypedQuery & LT; TestTable & gt; Query = entityManager.createQuery (SQL, TestTable.class); Query.setParameter (key, Arrays.asList (valueArr)) / *** Error Line *** Return query.getResultList (); } In the above error line, it throws the following exception: java.lang.IllegalArgumentException: parameter value element [[Ljava.lang.String; @ cbe5bc] did not match the expected type [java.lang.String] Why is this expected type string while actually this string []? Please help! Note: This is derived from the normal routine and is a simplified code. I can no...
Read more

c++ - static template member variable has internal linkage but is not defined -

Yes, I know, there is a question with almost the same title, but it refers to a different situation. Error message) In my case, I have a .cpp file with a big named designation name (implementation details). There is a property class template with a static data member in that name space, which I need to access from outside the unknown namespace. I give it a little bit of meat: file.hpp namespace Bar {template & lt; Typename A & gt; Struct foo {static_assert (is_same & lt; a, float & gt; :: value} is_same & lt; a, double>: value, ""); Fixed zero set_static_var (a const & x); // ...}; } and file.cpp namespace {template & lt; Typename A & gt; Struct foo_traits {// supports the implementation of several static code bars: foo & lt; & Gt; Fixed A data; }; The template's & lt; & Gt; Float foo_traits & lt; Float & gt; :: datum; // No change if this is in the global namespace template & lt; & Gt; Doub...
Read more