---
title: "+(_:_:)"
framework: swift
role: symbol
role_heading: Operator
path: "swift/uint/+(_:_:)"
---

# +(_:_:)

Adds two values and produces their sum.

## Declaration

```swift
static func + (lhs: UInt, rhs: UInt) -> UInt
```

## Parameters

- `lhs`: The first value to add.
- `rhs`: The second value to add.

## Discussion

Discussion The addition operator (+) calculates the sum of its two arguments. For example: 1 + 2                   // 3 -10 + 15                // 5 -15 + -5                // -20 21.5 + 3.25             // 24.75 You cannot use + with arguments of different types. To add values of different types, convert one of the values to the other value’s type. let x: Int8 = 21 let y: Int = 1000000 Int(x) + y              // 1000021 The sum of the two arguments must be representable in the arguments’ type. In the following example, the result of 21 + 120 is greater than the maximum representable Int8 value: x + 120                 // Overflow error note: Overflow checking is not performed in -Ounchecked builds. If you want to opt out of overflow checking and wrap the result in case of any overflow, use the overflow addition operator (&+). x &+ 120                // -115