tostring – Page 7 – Tarik Billa

Why is a round-trip conversion via a string not safe for a double?

October 19, 2022 by Tarik

I found the bug. .NET does the following in clr\src\vm\comnumber.cpp: DoubleToNumber(value, DOUBLE_PRECISION, &number); if (number.scale == (int) SCALE_NAN) { gc.refRetVal = gc.numfmt->sNaN; goto lExit; } if (number.scale == SCALE_INF) { gc.refRetVal = (number.sign? gc.numfmt->sNegativeInfinity: gc.numfmt->sPositiveInfinity); goto lExit; } NumberToDouble(&number, &dTest); if (dTest == value) { gc.refRetVal = NumberToString(&number, ‘G’, DOUBLE_PRECISION, gc.numfmt); goto lExit; } DoubleToNumber(value, … Read more

Problem with converting int to string in Linq to entities

October 15, 2022 by Tarik

With EF v4 you can use SqlFunctions.StringConvert. There is no overload for int so you need to cast to a double or a decimal. Your code ends up looking like this: var items = from c in contacts select new ListItem { Value = SqlFunctions.StringConvert((double)c.ContactId).Trim(), Text = c.Name };

to_string is not a member of std, says g++ (mingw)

October 4, 2022 by Tarik

This is a known bug under MinGW. Relevant Bugzilla. In the comments section you can get a patch to make it work with MinGW. This issue has been fixed in MinGW-w64 distros higher than GCC 4.8.0 provided by the MinGW-w64 project. Despite the name, the project provides toolchains for 32-bit along with 64-bit. The Nuwen … Read more

How to get the entire document HTML as a string?

September 30, 2022 by Tarik

MS added the outerHTML and innerHTML properties some time ago. According to MDN, outerHTML is supported in Firefox 11, Chrome 0.2, Internet Explorer 4.0, Opera 7, Safari 1.3, Android, Firefox Mobile 11, IE Mobile, Opera Mobile, and Safari Mobile. outerHTML is in the DOM Parsing and Serialization specification. See quirksmode for browser compatibility for what … Read more

Enum ToString with user friendly strings

September 26, 2022 by Tarik

I use the Description attribute from the System.ComponentModel namespace. Simply decorate the enum: private enum PublishStatusValue { [Description(“Not Completed”)] NotCompleted, Completed, Error }; Then use this code to retrieve it: public static string GetDescription<T>(this T enumerationValue) where T : struct { Type type = enumerationValue.GetType(); if (!type.IsEnum) { throw new ArgumentException(“EnumerationValue must be of Enum … Read more

How do I print my Java object without getting “SomeType@2f92e0f4”?

September 22, 2022 by Tarik

Background All Java objects have a toString() method, which is invoked when you try to print the object. System.out.println(myObject); // invokes myObject.toString() This method is defined in the Object class (the superclass of all Java objects). The Object.toString() method returns a fairly ugly looking string, composed of the name of the class, an @ symbol … Read more

Converting an object to a string

September 2, 2022 by Tarik

I would recommend using JSON.stringify, which converts the set of the variables in the object to a JSON string. var obj = { name: ‘myObj’ }; JSON.stringify(obj); Most modern browsers support this method natively, but for those that don’t, you can include a JS version.

How can I convert a stack trace to a string?

August 27, 2022 by Tarik

Use Throwable.printStackTrace(PrintWriter pw) to send the stack trace to an appropriate writer. import java.io.StringWriter; import java.io.PrintWriter; // … StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); e.printStackTrace(pw); String sStackTrace = sw.toString(); // stack trace as a string System.out.println(sStackTrace);