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Working with percentages in C#

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  • D Offline
    D Offline
    dougins
    wrote on last edited by
    #1

    I have the following code: double numdaysPercentage; numdaysPercentage = 14/30; I get an answer like 0.0. I should get an answer like .4666667 Can someone tell me what I am doing wrong.

    C V S 3 Replies Last reply
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    • D dougins

      I have the following code: double numdaysPercentage; numdaysPercentage = 14/30; I get an answer like 0.0. I should get an answer like .4666667 Can someone tell me what I am doing wrong.

      C Offline
      C Offline
      Christian Graus
      wrote on last edited by
      #2

      If you divide by an int, you get an int. double n = 14/30.0; will work or double n = 14/(double)30;

      Christian Graus Please read this if you don't understand the answer I've given you "also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

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      • D dougins

        I have the following code: double numdaysPercentage; numdaysPercentage = 14/30; I get an answer like 0.0. I should get an answer like .4666667 Can someone tell me what I am doing wrong.

        V Offline
        V Offline
        Vikram A Punathambekar
        wrote on last edited by
        #3

        You are doing integer division, and 14/30 is indeed 0. On the other hand, 14.0/30 will give you what you are looking for.

        Cheers, Vikram.


        The hands that help are holier than the lips that pray.

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        • D dougins

          I have the following code: double numdaysPercentage; numdaysPercentage = 14/30; I get an answer like 0.0. I should get an answer like .4666667 Can someone tell me what I am doing wrong.

          S Offline
          S Offline
          Simon P Stevens
          wrote on last edited by
          #4

          The suggestions above are good, you can also tag the numbers with an 'd' to indicate they are doubles. (Or 'f' for floats) double n = 14d / 30d;

          Simon

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