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# Arithmetic Operators

Swift 4 supports the four standard arithmetic operators of all number types:

- Addition (+) Operator
- Subtraction (-) Operator
- Multiplication (*) Operator
- Division (/) Operator

Swift 4 arithmetic operators don’t allow values to overflow by default (like the arithmetic operators in C and Objective-C language do).

In Swift 4, we can opt in to value overflow behavior by using Swift’s overflow operators (such as a &+ b).

We can also use addition operator for String concatenation:

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