How do I seperate integers?

This is a discussion on How do I seperate integers? within the C++ Programming forums, part of the General Programming Boards category; Hi, I'm doing this little program at the moment where I have to imput a 5-digit integer, seperate the number ...

  1. #1
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    How do I seperate integers?

    Hi,

    I'm doing this little program at the moment where I have to imput a 5-digit integer, seperate the number into its individual digits and prints the digits seperated from one another by three spaces each.
    It gives me a hint that I should use the division and modulus operators.

    Iv'e started like this, but really am clueless how to tackle this, can anyone give me a few tips and/or pointers

    thanks for any help

    Code:
    int main(int argc, char* argv[])
    {
       int number;
    
       cout << "Enter a five digit integer: ";
       cin >> number;
    
       number = number / 10;
       cout << number;
    
       number = number / 100;
       cout << number;
    
       number = number / 1000;
       cout << number;
    
       number = number / 10000;
       cout << number;
    
       getch();
       return 0;
    }

  2. #2
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    Here's how I would do it

    If 51236 is entered,

    Code:
     
    51236 / 10000 = 5 rem 1236 
     1236 /  1000 = 1 rem 236 
      236 /   100 = 2 rem 36 
       36 /    10 = 3 rem 6 
        6 /     1 = 6
    silk.odyssey

  3. #3
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    yes, but the input is not pre-determined. and i have never comes across "rem" before yet.

  4. #4
    Registered User Codeplug's Avatar
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  5. #5
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    Guti14,

    rem just meant remainder. I know the input is not predetermined, I was just suggesting a way you could write the program.

    51236 / 10000 = 5 rem 1236

    51236 divided by 10000 is 5 with 1236 remaining. So we know that the first number is 5.

    1236 / 1000 = 1 rem 236

    1236 divided by 1000 gives us 1 with 236 remaining. So we know 1 is the second number.

    236 / 100 = 2 rem 36
    36 / 10 = 3 rem 6
    6 / 1 = 6

    Same idea for the other numbers. It's a simple algorithm and it should work for any 5 digit number.
    silk.odyssey

  6. #6
    Toaster Zach L.'s Avatar
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    For an arbitrary number of digits, you need only compute the number of decimal digits to use in a loop. The number of digits will be floor(log10(n)) + 1.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  7. #7
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    You don't need to know the number of digits to print it out backwards, this is probably giving too much help but.
    Code:
        std::cout << n % 10;
        while(n /= 10) std::cout << "   " << (n % 10);
        std::cout << std::endl;

  8. #8
    Toaster Zach L.'s Avatar
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    ^ True, but to print it out forward you probably should, but it could be done otherwise:

    Code:
    unsigned reverse(unsigned x)
    {
      unsigned t = 0;
    
      do
      {
        t *= 10;
        t += x % 10;
        x /= 10;
      } while(x);
    
      return t;
    }
    And then grib's code would work.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  9. #9
    Rabite SirCrono6's Avatar
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    silk.odyssey,

    Actually, those aren't reamainders. 51236 / 10000 = 5.1236
    Note the decimal. So they aren't reamainders, but decimals. Use a calculator if you don't believe me.

    -SirCrono6
    From C to shining C++!

    Great graphics, sounds, algorithms, AI, pathfinding, visual effects, cutscenes, etc., etc. do NOT make a good game.
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  10. #10
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    Sir Crono, we aren't using a calculator, we're using C++, the result of int/int is another int (truncated (a/b)*b+a%b==a).

    Zach, I think your right and the op wanted it forwards, hmmm. Must come up with goofier way do to this.

    Code:
    void f(unsigned n) {if(n) {f(n/10); std::cout << (n % 10) << "   ";}}

  11. #11
    Rabite SirCrono6's Avatar
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    Yeah, I know. I guess I was just thinking math - math. Int, integer, whole number. Float, float, decimal. Char, character, letter...

    -SirCrono6
    From C to shining C++!

    Great graphics, sounds, algorithms, AI, pathfinding, visual effects, cutscenes, etc., etc. do NOT make a good game.
    - Bubba

    IDE and Compiler - Code::Blocks with MinGW
    Operating System - Windows XP Professional x64 Edition

  12. #12
    Toaster Zach L.'s Avatar
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    Originally posted by grib

    Code:
    void f(unsigned n) {if(n) {f(n/10); std::cout << (n % 10) << "   ";}}
    Nice.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

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