to add commas

This is a discussion on to add commas within the C++ Programming forums, part of the General Programming Boards category; Is there a function that will add commas to large numbers? For example if my input argument is 123456789 is ...

  1. #1
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    to add commas

    Is there a function that will add commas to large numbers?
    For example if my input argument is 123456789 is there a function that will print it out as 123,456,789?

    Thanks!!

  2. #2
    Senior Member joshdick's Avatar
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    That would be incredibly easy to write. I'd suggest doing it yourself.
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  3. #3
    Wen Resu
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    Almost sounds like homework...

  4. #4
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    it ALMOST is homework. It just doesn't sound all that easy. I've seen something like take the number and divide it by 1,000. But I'm not sure how exactly to do it.

  5. #5
    and the hat of wrongness Salem's Avatar
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    > 123456789

    123456789 / 1000 = 123456
    123456789 % 1000 = 789

    Rinse and repeat until x/1000 is zero
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  6. #6
    Code Goddess Prelude's Avatar
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    >Is there a function that will add commas to large numbers?
    If you look around a bit, you'll find a function that I've posted before which does precisely this.

    [edit]
    I couldn't find it, so here's the basic idea:
    Code:
    #include <iostream>
    #include <string>
    
    bool third_char ( int pos )
    {
      return pos != 0 && pos % 3 == 0;
    }
    
    std::string commaize ( unsigned long val )
    {
      std::string buff;
      int i = 0;
    
      // The workhorse algorithm. Use of std::string::insert
      // is okay since the string will not be very long even
      // for large unsigned long values. If you end up using
      // an arbitrary length number, changing this to use a
      // more suitable buffer container would be advisable
      do {
        if ( third_char ( i++ ) )
          buff.insert ( buff.begin(), ',' );
        buff.insert ( buff.begin(), '0' + val % 10 );
      } while ( ( val /= 10 ) != 0 );
    
      return buff;
    }
    
    int main()
    {
      std::cout<< commaize ( 1234567890 ) <<std::endl;
    }
    [/edit]
    Last edited by Prelude; 11-04-2003 at 08:00 AM.
    My best code is written with the delete key.

  7. #7
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    Thanks Prelude & Salem!

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