Code Red > .NET

Convert string to non-negative, non-zero double with default value

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Keith™:
I needed something like this .. comments and suggestions are welcome.


--- Code - C#: ---public double toPositiveDouble(string input, double def = 1){    double dv;    if (!Double.TryParse(input, out dv){        //can't parse, return default        dv = def;    }    else if ((dv + Math.Abs(dv)) == 0){        //value was negative, return default        dv = def;    }}

Atook:
Was there a reason for the Abs call instead of checking for <0?

Here's my take, the extension method might be considered bad form. :)

--- Code - C#: ---public static double ToPositiveDouble(this string input, double def = 1){  double dv;  if (!Double.TryParse(input, out dv)){    //can't parse, return default    return def;  }  else if (dv<0)  {    //value was negative, return default    dv = def;  }  return dv;} // usagestring d = "-36";double dv = d.ToPositiveDouble(42.0);  

Keith™:
No, just a brain fart

Atook:

--- Quote from: Keith™ on June 17, 2017, 01:09:41 PM ---No, just a brain fart

--- End quote ---
Don't feel too bad, I hadn't had my coffee yet, realized I couldn't figure out how to check if a number was negative and google lead me here... 8-)

That's when I remembered my rule of no code before coffee..

kdub_nz:
How about :


--- Code - C#: ---void Main() {        Console.WriteLine(IsNegative(-3.7));        Console.WriteLine(IsNegative(42));         //-------        string ds = "36";        double dv = ToPositiveDouble(ds, 42.0);        Console.WriteLine($"{ds} : =>{dv}");        //-------        ds = "-36";        dv = ToPositiveDouble(ds, 42.0);        Console.WriteLine($"{ds} : =>{dv}");         //-------        ds = "";        dv = ToPositiveDouble(ds, 42.0);        Console.WriteLine($"{ds} : =>{dv}");         //-------        ds = "0";        dv = ToPositiveDouble(ds, 42.0);        Console.WriteLine($"{ds} : =>{dv}");} public static double ToPositiveDouble(string input, double def = 1) {        double dv;              return (Double.TryParse(input, out dv) && !IsNegative(dv)) ? dv : def; } /// Zero is considered negative in this worldpublic static bool IsNegative<T>(T value)   where T : struct, IComparable<T> {        return value.CompareTo(default(T)) <= 0;}   


True
False
36 : =>36
-36 : =>42
 : =>42
0 : =>42


Revised : /// Zero is considered negative in this world

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