RE: [Dev-C++] weird result

[Ramana K. <ra...@my...>]

Well, that is very weird indeed. I have played around a bit with your code
and have found a solution, but a better explaination would be welcome. I
tried
    cout << 2147483648;
and the complier gave me a warning that the integer was so large it would
have to be unsigned. so i decided to make the result of the Power(int,int)
function unsigned.
Thus:
instead of
    cout << "Power(" << a << "," << n+1 << ")= " << Power(a,n+1) << endl;"
you have this:
    cout << "Power(" << a << "," << n+1 << ")= " << (unsigned) Power(a,n+1)
<< endl;
and it works fine.
  -----Original Message-----
  From: dev...@li...
[mailto:dev...@li...]On Behalf Of Jose Gana
  Sent: Sunday, 16 June 2002 1:30 AM
  To: dev...@li...
  Subject: [Dev-C++] weird result


  Hi!
  Sorry if it is too obvious!
   I am new in C++. I got 2^30= Power(2,30)= - 2147483648 in stead of +
2147483648 in my program.

  I must have done something wrong. But I can figure it out. Can somebody
help me out?



  #include <iostream>

  #include <cstdlib>



  using namespace std;



  int Power(int a, int n);



  int main()

  {

   int a=2, n=30;           //int limit == 4294967295;

                                    // Power(2,30)==1073741824

                                    // Power(2,31)==2147483648

                                    // Power(2,32)==4294967296 out of limit
=> Power(2,32)==0



   cout << "Power(" << a << "," << n << ")= " << Power(a,n) << endl;

   cout << "Power(" << a << "," << n+1 << ")= " << Power(a,n+1) << endl;



   system("PAUSE");

   return 0;

  }



  int Power(int a, int n)

  {

   int i=1, r=1;

   for (i=1;i<=n;i++)

   {

   r=r*a;

   }

   return r;

  }



  I am using Dev-C++ version 4.01. in windows XP

  Thank you for your help to this matter.



  Jose Gana

  Santiago, Chile.



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