Decimals numbers are a data type that aims to exactly represent decimal numbers. Some programmers may not know, or fully realize, that, in most programming languages, the numbers that you enter *look* like decimal numbers but internally are represented as binary—that is, base-2—floating-point numbers. Things that are totally simple for us, such as `0.1`

, simply cannot be represented exactly in binary. The decimal data type—whatever its stripe or flavor—aims to remedy this by giving us a way of representing and working with decimal numbers, not binary approximations thereof. (Wikipedia has more.)

To help with my work on adding decimals to JavaScript, I've gone through a list of popular programming languages, taken from the 2022 StackOverflow developer survey. What follows is a brief summary of where these languages stand regarding decimals. The intention is to keep things simple. The purpose is:

- If a language does have decimals, say so;
- If a language does not have decimals, but at least one third-party library exists, mention it and link to it. If a discussion is underway to add decimals to the language, link to that discussion.

There is no intention to filter out an language in particular; I'm just working with a slice of languages found in in the StackOverflow list linked to earlier. If a language does not have decimals, there may well be multiple third-part decimal libraries. I'm not aware of all libraries, so if I have linked to a minor

library and neglect to link to a more high-profile one, please let me know. More importantly, if I have misrepresented the basic fact of whether decimals exists at all in a language, send mail.

C does **not** have decimals. But they're working on it! The C23 standard (as in, 2023) standard proposes to add new fixed bit-width data types (32, 64, and 128) for these numbers.

C# has decimals in its underlying .NET subsystem. (For the same reason, decimals also exist in Visual Basic.)

C++ does **not** have decimals. But—like C—they're working on it!

Dart does **not** have decimals. But a third-party library exists.

Go does not have decimals, but a third-party library exists.

Java has decimals.

JavaScript does not have decimals. We're working on it!

Kotlin does not have decimals. But, in a way, it does: since Kotlin is running on the JVM, one can get decimal functionality by using Java's built-in support.

PHP does not have decimals. An extension exists and at least one third-party library exists.

Python has decimals.

Ruby has decimals. Despite that, there is some third-party work to improve the built-in support.

Rust does not have decimals, but a crate exists.

SQL has decimals (it is the `DECIMAL`

data type). (Here is the documentation for, e.g., PostgreSQL, and here is the documentation for MySQL.)

Swift has decimals

TypeScript does not have decimals. However, if decimals get added to JavaScript (see above), TypeScript will probably inherit

decimals, eventually.