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CPP float keyword

Return to float, C++ Reserved words, C++, Reserved Words, CPP Glossary, CPP Topics

Here's an in-depth comparison of the C++ `float` keyword to its equivalent in Python, Java, C#, Kotlin, JavaScript, TypeScript, PHP, Go, Rust, Swift, Transact-SQL, and PL/SQL, complete with code examples and summaries. This will help understand the nuances of floating-point representation across different programming languages.

C++

In C++, `float` is a floating-point data type used to store single-precision floating-point numbers. It typically requires 4 bytes of memory and can represent a wide range of decimal values with significant digits up to 7.

```cpp float a = 3.14f; // Declaration of a float variable ```

C++ documentation: s://en.cppreference.com/w/cpp/language/types(https://en.cppreference.com/w/cpp/language/types)

Python

Python does not have a specific keyword like `float` for declaring variables; it uses dynamic typing. However, Python supports floating-point numbers, and variables can store them without specifying their type explicitly. The precision of floating-point numbers in Python is implementation-dependent but is typically double precision.

```python a = 3.14 # Python automatically recognizes this as a floating-point number ```

Python documentation: s://docs.python.org/3/tutorial/floatingpoint.html(https://docs.python.org/3/tutorial/floatingpoint.html)

Java

In Java, `float` is a 32-bit IEEE 754 floating-point. It's similar to C++ in its precision and storage requirements but requires an explicit `f` or `F` suffix to distinguish it from double precision literals.

```java float a = 3.14f; // Java float variable declaration ```

Java documentation: s://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html(https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html)

C#

C# `float` is a 32-bit IEEE 754 single-precision floating-point type. Like Java, it requires an `f` or `F` suffix for literals.

```csharp float a = 3.14f; // C# float variable declaration ```

C# documentation: s://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/floating-point-numeric-types(https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/floating-point-numeric-types)

Kotlin

Kotlin also uses `float` for 32-bit floating-point numbers, with the same `f` or `F` suffix requirement for literals to distinguish them from double precision values.

```kotlin var a: Float = 3.14f // Kotlin float variable declaration ```

Kotlin documentation: s://kotlinlang.org/docs/basic-types.html#floating-point-types(https://kotlinlang.org/docs/basic-types.html#floating-point-types)

JavaScript

JavaScript does not have a `float` type; instead, all numbers in JavaScript are treated as double-precision floating-point numbers according to the IEEE 754 standard.

```javascript var a = 3.14; // JavaScript automatically treats this as a double-precision number ```

JavaScript documentation: s://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#number_type(https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#number_type)

TypeScript

TypeScript, being a superset of JavaScript, also does not distinguish between float and double types. All numbers are considered as `number` type, following the IEEE 754 double-precision format.

```typescript let a: number = 3.14; // TypeScript number variable ```

TypeScript documentation: s://www.typescriptlang.org/docs/handbook/basic-types.html#number(https://www.typescriptlang.org/docs/handbook/basic-types.html#number)

PHP

PHP dynamically types its variables, similar to Python, and does not require a specific keyword to declare a variable as a float. The type is determined by the context in which the variable is used.

```php $a = 3.14; // PHP float ```

PHP documentation: s://www.php.net/manual/en/language.types.float.php(https://www.php.net/manual/en/language.types.float.php)

Go

Go has a `float32` type, which is equivalent to the `float` type in C++, Java, C#, and Kotlin, representing a 32-bit floating-point number.

```go var a float32 = 3.14 // Go float32 variable declaration ```

Go documentation: s://golang.org/pkg/builtin/#float32(https://golang.org/pkg/builtin/#float32)

Rust

Rust provides two floating-point types: `f32` for 32-bit floating-point numbers and `f64` for 64-bit floating-point numbers. The `f32`

type is equivalent to the `float` type in other languages mentioned.

```rust let a: f32 = 3.14; // Rust f32 variable declaration ```

Rust documentation: s://doc.rust-lang.org/book/ch03-02-data-types.html#floating-point-types(https://doc.rust-lang.org/book/ch03-02-data-types.html#floating-point-types)

Swift

Swift uses `Float` for 32-bit floating-point numbers, similar to other languages' `float` type. It also supports `Double` for 64-bit floating-point numbers.

```swift var a: Float = 3.14 // Swift Float variable declaration ```

Swift documentation: s://docs.swift.org/swift-book/LanguageGuide/TheBasics.html(https://docs.swift.org/swift-book/LanguageGuide/TheBasics.html)

Transact-SQL

Transact-SQL uses `float` to define floating-point numbers. The precision can be specified, affecting the storage size.

```sql DECLARE @a float = 3.14; – T-SQL float variable declaration ```

Transact-SQL documentation: s://docs.microsoft.com/en-us/sql/t-sql/data-types/float-and-real-transact-sql(https://docs.microsoft.com/en-us/sql/t-sql/data-types/float-and-real-transact-sql)

PL/SQL

In PL/SQL, `BINARY_FLOAT` is the equivalent of the `float` type in other languages, designed for single-precision floating-point numbers.

```plsql DECLARE

 a BINARY_FLOAT := 3.14;

BEGIN

 NULL;

END; ```

PL/SQL documentation: s://docs.oracle.com/cd/B19306_01/appdev.102/b14261/datatypes.htm#i42508(https://docs.oracle.com/cd/B19306_01/appdev.102/b14261/datatypes.htm#i42508)

Each of these languages handles floating-point numbers differently, reflecting variations in precision, syntax, and type declaration. This overview provides a glimpse into the diverse approaches to data types across programming environments, emphasizing the importance of understanding the specifics of each language when working with numbers, especially floating-point representations.

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C++: Effective C++, C++ Best Practices, C++ Core Guidelines (CG) by Bjarne Stroustrup and Herb Sutter, C++ Fundamentals, C++ Inventor - C++ Language Designer: Bjarne Stroustrup in 1985; C++ Keywords, C++ Built-In Data Types, C++ Data Structures (CPP Containers) - C++ Algorithms, C++ Syntax, C++ OOP - C++ Design Patterns, Clean C++ - C++ Style Guide - C++ BDD, C++ Standards ( C++ 23, C++ 20, C++ 17, C++ 14, C++ 11, C++ 03, C++ 98), Bjarne Stroustrup's C++ Glossary - Glossaire de CCP - French, CppReference.com, CPlusPlus.com, ISOcpp.org, C++ Compilers (Compiler Explorer, MinGW), C++ IDEs, C++ Development Tools, C++ Linter, C++ Debugging, C++ Modules ( C++20), C++ Packages, C++ Package Manager ( Conan - the C/C++ Package Manager), C++ Standard Library, C++ Libraries, C++ Frameworks, C++ DevOps - C++ SRE, C++ CI/CD ( C++ Build Pipeline), C++ Data Science - C++ DataOps, C++ Machine Learning, C++ Deep Learning, Functional C++, C++ Concurrency, C++ History, C++ Topics, C++ Bibliography, Manning C++ Series, C++ Courses, CppCon, C++ Research, C++ GitHub, Written in C++, C++ Popularity, C++ Awesome , C++ Versions. (navbar_cplusplus – see also navbar_cpp_containers, navbar_cppcon, navbar_cpp_core_guidelines, navbar_cpp23, navbar_cpp20, navbar_cpp17, navbar_cpp14, navbar_cpp11)

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CPP float keyword

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