// exsw3.swift  declare constants, variables, arrays
//              see exsw3a for sets, dictionaries and classes

#if os(OSX) || os(iOS) // for libraries, portable for OSX and Linux
import Foundation
#elseif os(Linux)
import Glibc
#endif// 

print("exsw3.swift running")
let c1 = 1                     // integer constant
// let c2= 1                   // error must have space each side of operator
var c3 = 2                     // integer variable initial value 2
let f1 = 7.5                   // floating point constant
var f2 = 37.5e-6               // floating point variable
let s1 = "unchangeable string"
var s2 = "changeable string"
print("c1= \(c1)")
print("c3= \(c3)")
print("f1= \(f1)")
print("f2= \(f2)")
print("s1= \(s1)")
print("s2= \(s2)")

// var c4 : Int = 8.2          // error
let f3 : Double = 8            // this will be constant 8.0
var f4 : Double = 9            // this will be variable initial value 9.0
print("f3 as integer= \(f3)")
print("f4 as integer= \(f4)")

// define an empty array
var someInts = [Int]()
someInts.append(1)
someInts.append(2)
print("someInts= \(someInts)")
someInts = []                  // back to empty array

// define an initialized array with values of same type
var V1 = [1.2, 1.3, 1.4]
print("V1= \(V1)")
var M2 = [[1.1, 1.2, 1.3],[2.1,2.2,2.3],[3.1,3.2,3.3]]
print("M2= \(M2)")
var M3 = [[[1.1, 1.2],[2.1,2.2]],[[3.1,3.2],[4.1,4.2]]]
print("M3= \(M3)")

// define and initialized array with some value
var big = [Double](repeating: 0.0, count:1000)
print("big[999]= \(big[999])")
var M2D = [[Double]](repeating:[Double](repeating:2.0,count:2),count:3)
print("M2D=\(M2D)")
var M3D = [[[Double]]](repeating:[[Double]](repeating:[Double](repeating:3.0,count:2),count:2),count:2)
print("M3D=\(M3D)")

print("exsw3.swift finished")