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Problem doing comparisons with fractions

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    Problem doing comparisons with fractions

    Hi Ninjas,

    This is simple but I still can't see why.

    I'm doing a very simple logic comparison, a double variable against a fraction. For example:

    Let's suppose a=0.5, then I do

    if ( a>0.4 && a<0.6 )
    {
    EnterLong(100000, "BUY");
    }

    under this way the code sends a BUY order, BUT if I do the same comparison like this:

    if ( a>4/10 && a<6/10 )
    {
    EnterLong(100000, "BUY");
    }

    The code does nothing. Why? and how can I solve it? Despite this problem is easy to solve writing directly, I use a lot fractions, so I´d like to know how.

    Thanks

    #2
    I found the solution. Obviously cause the type of variable.

    If I do this change, then it does work perfect

    if ( a>4.0/10.0 && a<6.0/10.0 )
    {
    EnterLong(100000, "BUY");
    }

    Comment


      #3
      Originally posted by pstrusi View Post
      I found the solution. Obviously cause the type of variable.

      If I do this change, then it does work perfect

      if ( a>4.0/10.0 && a<6.0/10.0 )
      {
      EnterLong(100000, "BUY");
      }

      Correct. Also see the C# Reference for the division operator.

      http://msdn.microsoft.com/en-us/library/3b1ff23f.aspx

      "When you divide two integers, the result is always an integer. For example, the result of 7 / 3 is 2. To determine the remainder of 7 / 3, use the remainder operator (%). To obtain a quotient as a rational number or fraction, give the dividend or divisor type float or type double
      ."

      Sample results:

      7 / 3 = 2
      -7 / 3 = -2
      7 % 3 = 1
      7 / 3.0 = 2.33333333333333
      7.0 / 3 = 2.33333333333333
      8 / 5 = 1
      8 / -5 = -1
      8 % 5 = 3
      8 / 5.0 = 1.6
      8.0 / 5 = 1.6
      Last edited by Harry; 07-30-2013, 09:09 AM.

      Comment

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