too many variables defined

This is a discussion on too many variables defined within the C++ Programming forums, part of the General Programming Boards category; This is what I have: Code: #include <iostream.h> //f(1)=2, f(2)=2, f(n)=2*f(n-1) + f(n-2) int f(int n) { if (n <= ...

  1. #1
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    too many variables defined

    This is what I have:
    Code:
     
    #include <iostream.h>
    
    //f(1)=2, f(2)=2, f(n)=2*f(n-1) + f(n-2)
    
     int f(int n) 
     {
    
     	if (n <= 2) 
    	{
     		return 2;
    	}
    
    	return (2 * f(n - 1) + f(n - 2));
    
     }
     
     
     // This part was to test my code.
     int main() 
    { 
       for ( int i = 0; i < 4; ++i ) 
       { 
          std::cout << "f(" << i << ") = " << f(i) << std::endl; 
       } 
       return 0; 
    }
    I am supposed to just compute for f. This defines too many values, it should just define for n >=1, so do I change my 2 to a 1? Not sure here. Thanks!!

  2. #2
    and the hat of wrongness Salem's Avatar
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    I don't see a problem

    Compiles OK and produces
    f(0) = 2
    f(1) = 2
    f(2) = 2
    f(3) = 6
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    Yes, I know....but I am not supposed to define that many variables, just n>=1. Any ideas?

  4. #4
    ATH0 quzah's Avatar
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    There are no variables "defined" inside the function f. The only variable "defined" is i in your test loop.

    Quzah.
    Hope is the first step on the road to disappointment.

  5. #5
    and the hat of wrongness Salem's Avatar
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    Perhaps campermama, you should describe the problem, rather than try to explain a solution.

    I get the feeling that f(x) is supposed to produce a different sequence than 2,2,2,6
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
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    I think the problem was I was showing a result for f(0) and that was not part of this recursive,
    Code:
     
    f(1)=2, f(2)=2, f(n)=2*f(n-1) + f(n-2)
    So I changed my code to just show f(1), f(2), and f(3).

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