# Solved: format decimal place

In the world of software development, a common issue personnel often face revolves around the accurate processing and formatting of decimal numbers. Numbers of this kind are regularly dealt with in apps that handle financial transactions, measurements, and other precision-required tasks. Ensuring their correct formatting is crucial, hence requiring the need to focus on formatting decimal places in Swift.

## The Swift Language and Number Formatting

Swift language, developed by Apple, is a powerful and intuitive programming language for iOS, macOS, watchOS, and beyond. It brings about a very reliable and efficient environment for developers, catering to various tasks in software development. One essential element in that scope is the handling of numbers, most especially, decimal numbers.

Swift offers several built-ins for operating with and manipulating numbers. Decimal numbers, for one, can be processed and formatted with the aid of ‘NumberFormatter’.

A ‘NumberFormatter’ is an integral feature of Swift that allows you to convert non-localized numbers into and out of localized number representations (strings).

```import Foundation

let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .decimal
numberFormatter.minimumFractionDigits = 2
numberFormatter.maximumFractionDigits = 2

let number = 1234.5678
if let formattedNumber = numberFormatter.string(from: NSNumber(value: number)) {
print(formattedNumber)
}
```

## Step-by-Step Explanation of the Code

Starting on a granular level, you first need to import ‘Foundation’. This import asserts that the code will use functionalities not only from the Swift language but also from the Foundation framework, a framework that provides fundamental software services useful to applications and application environments.

The ‘NumberFormatter’ constructed here is central to the process.

Its ‘numberStyle’ property employs ‘.decimal’ to specify that the formatter is configured to handle decimal numbers. ‘minimumFractionDigits’ is set to 2 to ensure the decimal representation will not round off to less than 2 decimal digits, and similarly, ‘maximumFractionDigits’ also ensures it wouldn’t round up after 2 decimal places.

Essentially, the decimal number will reliably format to have exactly 2 digits following the decimal point.

Moving on, we have a ‘number’ that needs formatting. Execution of ‘numberFormatter.string’ performs the conversion of ‘number’ into a string while asserting the formatter’s rules. However, notice it’s wrapped with an ‘if let’ statement. This is because ‘numberFormatter.string’ returns an optional, meaning it may or may not contain a value. The ‘if let’ construct ensures you effectively unwrap the optional and access the contained value safely.

## Libraries or Functions Surrounding Number Formatter

Although the NumberFormatter is a powerful tool, Swift equips you with numerous other libraries and functions that significantly aid in number handling and processing tasks.

For instance, NSNumber’s ‘doubleValue’ can be used to convert the NSNumber instance to a basic floating-point value. With SwiftUI, a new library introduced recently in Swift 5, developing user interfaces across all Apple platforms has become far easier by making your code easier to write and understand.

These functions, coupled with NumberFormatter, elevate your control over decimal number formatting significantly.

Remember, it is essential to ensure the accurate formatting of decimal numbers in Swift when dealing with processes or apps requiring precise calculation or finance handling. Proper understanding and usage of ‘NumberFormatter’ and potential processing libraries certainly make this a walk in the park.

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