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: