https://DevOpsCloud.io -- Cloud Monk Losang Jinpa, Ph.D., MCSE/MCT, GitOps DevOps Engineer

In C++, the `auto` keyword is used for type inference during variable declaration. It allows the compiler to deduce the type of a variable from its initializer expression. Here's a code example:

```cpp auto x = 42; // x is deduced as an int ```

C++ Documentation | https://en.cppreference.com/w/cpp/language/auto

In Python, there's no direct equivalent to C++'s `auto` because Python is dynamically typed. Variable types are determined at runtime, so there's no need for explicit type inference. Here's an example:

```python x = 42 # x is dynamically typed as an integer ```

Python Documentation | https://docs.python.org/3/tutorial/index.html

In Java, the `var` keyword was introduced in Java 10 to allow local variable type inference. It's similar to C++'s `auto` but is more limited in its use. Here's how it's used:

```java var x = 42; // x is inferred as an int ```

Java Documentation | https://docs.oracle.com/en/java/javase/index.html

In C#, the `var` keyword is used for type inference, allowing the compiler to determine the type of a variable based on the assigned value. Here's an example:

```csharp var x = 42; // x is inferred as an int ```

Documentation | https://docs.microsoft.com/en-us/dotnet/csharp/

In Kotlin, the `val` keyword is used for immutable variables with type inference. It's similar to C++'s `auto` but emphasizes immutability. Here's an example:

```kotlin val x = 42 // x is inferred as an Int ```

Kotlin Documentation | https://kotlinlang.org/docs/reference/

In JavaScript and TypeScript, variable declarations can use `const`, `let`, or `var` keywords. While not directly equivalent to C++'s `auto`, they offer similar flexibility in variable typing. Here's an example:

```javascript const x = 42; // x is constant and inferred as a number ```

In TypeScript, type inference can also be achieved using `let` or `const`:

```typescript const x = 42; // x is inferred as number ```

JavaScript Documentation | https://developer.mozilla.org/en-US/docs/Web/JavaScript TypeScript Documentation | https://www.typescriptlang.org/docs/

PHP is dynamically typed like Python, so there's no direct equivalent to C++'s `auto`. Variable types are determined at runtime.

In Go, the `:=` operator is used for variable declaration and assignment with type inference. It's similar to C++'s `auto` in that it infers the type of the variable from the assigned value. Here's an example:

```go x := 42 // x is inferred as an int ```

Go Documentation | https://golang.org/doc/

In Rust, the `let` keyword is used for variable declaration and pattern matching. While not exactly equivalent to C++'s `auto`, it allows for type inference. Here's an example:

```rust let x = 42; // x is inferred as an i32 (32-bit signed integer) ```

Rust Documentation | https://doc.rust-lang.org/book/

In Swift, type inference is used extensively to deduce the type of variables. There's no explicit keyword like C++'s `auto`, but the compiler automatically infers types based on the assigned values. Here's an example:

```swift let x = 42 // x is inferred as an Int ```

Swift Documentation | https://docs.swift.org/swift-book/LanguageGuide/TheBasics.html

In Transact-SQL (T-SQL), there's no direct equivalent to C++'s `auto`. However, dynamic SQL allows for executing SQL statements dynamically at runtime, providing some level of flexibility similar to type inference. Here's an example:

```sql DECLARE @x INT; SET @x = 42; – @x is inferred as an int ```

Transact-SQL Documentation | https://docs.microsoft.com/en-us/sql/t-sql/language-reference?view=sql-server-ver15

PL/SQL is statically typed, and variable types need to be explicitly declared. There's no direct equivalent to C++'s `auto` in PL/SQL.