Operators
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Operators allow you to perform basic math operations and assign values to variables in Swift. The main arithmetic operators are +, -, *, and /. You can perform calculations with integers and doubles, taking order of operations into account. Variables can be reassigned and updated using compound assignment operators like += and -=. When combining different numeric types in an expression, you may need to explicitly convert one of the values to match the other.
Operators
- 2. Assign a value Use the = operator to assign a value var favoritePerson = "Luke" Use the = operator to modify or reassign a value var shoeSize = 8 shoeSize = 9
- 3. Basic arithmetic You can use the +, -, *, and / operators to perform basic math functions var opponentScore = 3 * 8 var myScore = 100 / 4 You can also use the value of other variables var totalScore = opponentScore + myScore Or you can use the current variable you’re updating myScore = myScore + 3
- 4. Basic arithmetic Use Double values for decimal point precision let totalDistance = 3.9 var distanceTravelled = 1.2 var remainingDistance = totalDistance - distanceTravelled print(remainingDistance) 2.7
- 5. Basic arithmetic let x = 51 let y = 4 let z = x / y print(z) 12
- 6. Using Double values Basic arithmetic let x: Double = 51 let y: Double = 4 let z = x / y print(z) 12.75
- 7. Compound assignment var myScore = 10 myScore = myScore + 3 myScore += 3 myScore -= 5 myScore *= 2 myScore /= 2
- 8. Order of operations 1. ( ) 2. * / 3. + - var x = 2 var y = 3 var z = 5 print(x + y * z) print((x + y) * z) 17 25
- 9. Numeric type conversion let x = 3 let y = 0.1415927 let pi = x + y Binary operator ‘+’ cannot be applied to operands of type ‘Int’ and ‘Double’!
- 10. Numeric type conversion let x = 3 let y = 0.1415927 let pi = Double(x) + y
- 11. Lab: Operators Unit 1—Lesson 3 Open and complete the exercises in Lab-Operators.playground
- 12. © 2017 Apple Inc. This work is licensed by Apple Inc. under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.