data type limits

This is a discussion on data type limits within the C++ Programming forums, part of the General Programming Boards category; Can anyone tell me the upper and lower limits for the basic data types (int, float, long, etc.)? ie. Ints ...

  1. #1
    Registered User JTtheCPPgod's Avatar
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    data type limits

    Can anyone tell me the upper and lower limits for the basic data types (int, float, long, etc.)?
    ie. Ints have upper limits of 32000ish if I'm not mistaken, but I need the exact numbers.
    Thanks a bunch...

  2. #2
    End Of Line Hammer's Avatar
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    Look in limits.h
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Registered User JTtheCPPgod's Avatar
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    um

    That didn't seem to work.
    I'm not terribly advanced and I have trouble reading what the libraries say.
    And it also didn't look like it had all the data types I needed (if it did, they had different names)
    anybody else?
    "No! I must have my delicious cupcakes, my sweet cakey treasures, piping hot from their 40 watt WOMB!!!"
    --Captain Murphy

  4. #4
    I lurk
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    Look in either <limits> or <limits.h>
    Here's an example using limits:

    Code:
    #include <iostream>
    #include <limits>
    
    int main(int argc, char** argv)
    {
       using namespace std;
       cout << "\nsigned int max: " << std::numeric_limits<signed int>::max();
       cout << "\nsigned int min: " << std::numeric_limits<signed int>::min();
    
       cout << "\nchar max:  " << std::numeric_limits<char>::max();
       cout << "\nchar min: " << std::numeric_limits<char>::min();
    
       return 0;
    }

  5. #5
    Registered User JTtheCPPgod's Avatar
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    I'm afraid I still don't understand.
    I don't want a program that produces these values.
    I don't even have a copy of Visual Studio herea t home.
    I just need the numbers...
    "No! I must have my delicious cupcakes, my sweet cakey treasures, piping hot from their 40 watt WOMB!!!"
    --Captain Murphy

  6. #6
    Registered User Cela's Avatar
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    >>I just need the numbers...
    The numbers will be different for different machines. You have to use either <limits> or <climits>/<limits.h> for any measure of portability. If anyone gives you just the numbers and doesn't say "at least" then they're wrong. :-)
    *Cela*

  7. #7
    I lurk
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    It's implementation dependant.
    Depending on what system you're on, the size of different types vary.
    edit: Beaten

  8. #8
    nag
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    For a 16 bit machine it is

    unsigned int=2^16 -1 (2 to the power 16) =65535

    for a 32 bit machine

    unsigned int=2^32 -1 =4294967295

    for signed int value divide it by two
    at the moment my calculkator is not working
    Last edited by nag; 01-27-2003 at 08:20 AM.

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