Thread: Question about mixed data types- with division

  1. #1
    Registered User
    Join Date
    May 2009

    Question about mixed data types- with division

    Question about the expressions below:

    cout << 17 / 3.0 << endl;
    cout << 12.0 / 6 << endl;

    I realize about / and integer but why do I get an double result for the first expression and an integer result for the second...I was thinking about promotion of data types...but now I am confused..

    Insight appreciated...

  2. #2
    Registered User
    Join Date
    Oct 2006
    the result of an arithmetic operation is always the widest of all the data types in the operation, so double / char returns a double. long long / float returns float because float has the greater precision, even though long long is actually larger in bit count.

  3. #3
    Registered User
    Join Date
    May 2010
    What makes you suspect that you are getting an integer result? If you want the decimal point to show for "whole" numbers you must tell the system to display the decimal point for all values. See ios::showpoint().


  4. #4
    Algorithm Dissector iMalc's Avatar
    Join Date
    Dec 2005
    New Zealand
    12 divided by 6 came out to a whole number, that's all. I doesn't print the double result as 2.0 because you didn't ask it to, so it just picked the shortest way of representing the answer as a string.
    If you do:
    cout << 17.0 / 3 << endl;
    you'll see the same as the first line you had above.
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  5. #5
    Registered User
    Join Date
    May 2009
    Thank you all got what I needed...

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