Little Problem

This is a discussion on Little Problem within the C++ Programming forums, part of the General Programming Boards category; Hi, I have a problem with this: Code: #include<iostream.h> typedef unsigned long int ulong; int main() { ulong a,b; while(cin ...

  1. #1
    Registered User Moni's Avatar
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    Unhappy Little Problem

    Hi, I have a problem with this:

    Code:
    #include<iostream.h>
    
    typedef unsigned long int ulong;
    
    int main()
    {
    	ulong a,b;
    
       while(cin >> a >> b)
       {
    		if(a==0 && b==0)
          	return 0;
    
          int count = 0, cry = 0;
    
          while(a || b)
          {
          	int x = a%10, y = b%10;
    
             a/=10;
             b/=10;
    
             if((x+y+cry)>9)
             {
               	cry = 1;
             	count++;
             }
             else
             	cry = 0;
          }
    
          if(count>1)
          	cout << count << " carry operations." << endl;
          else if(count == 1)
             cout << "1 carry operation." << endl;
          else
          	cout << "No carry operation." << endl;
       }
    
       return 0;
    }
    IO:
    9 1
    1 carry operation.
    9 0
    1 carry operation.
    9 0
    No carry operation
    9 0
    No carry operation
    9 1
    No carry operation
    9 1
    1 carry operation.


    09 1
    No carry operatio
    1 carry operation
    But what you'll tell about it's output? Can anyone explain...why this is so ...???
    We all are the components of a huge program...... the programmer is always debugging us with His debugger.

  2. #2
    and the hat of wrongness Salem's Avatar
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    Perhaps because 09 is treated as an (out of bounds) octal number
    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
    Registered User Moni's Avatar
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    Hmmm...may be....
    but what you'll tell about the 2nd and 3rd IO set ???
    We all are the components of a huge program...... the programmer is always debugging us with His debugger.

  4. #4
    Registered User lobo's Avatar
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    ..i compiled that myself and it works OK - carry ops as expected...what compiler did u use? Try code

    int x, y;

    x = a % 10;
    y = b % 10;

    instead of

    int x = a %10, y = b%10;

  5. #5
    Registered User Moni's Avatar
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    Hi, lobo but why this would happen???

    I use borland C++ 5.02

    And what your compiler (what's it?) says about 2 & 3 IO set???
    We all are the components of a huge program...... the programmer is always debugging us with His debugger.

  6. #6
    Registered User lobo's Avatar
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    I tried your code along with your inputs and it works fine -- tried it on bcc5.5... try the thing i wrote above, it may help (not surely, though ), else try different compiler if u can...

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