Variables and Constants - Swift Programming

Use let for values that should not change and var for values that can be updated later.

Compute with stored values

variables.swift

let unitPrice = 
let quantity = 3
var total = unitPrice * quantity
total = total + 5
print("unit=\(unitPrice)")
print("total=\(total)")

let unitPrice = 
let quantity = 3
var total = unitPrice * quantity
total = total + 5
print("unit=\(unitPrice)")
print("total=\(total)")

let unitPrice = 
let quantity = 3
var total = unitPrice * quantity
total = total + 5
print("unit=\(unitPrice)")
print("total=\(total)")

let and var `let` creates a constant. `var` creates a variable that can be assigned again.