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Swift insight

Basic Data Type syntax:

print("Hello World!")

let t = 10

print ("value " ,t, "\n\n", 20, t*2 )

//t=20

var value = 100

if value > t && value < 200 {

  print("value is good!!!!!")

  value -= 10

  print("now value is  ",  value)

}

var intValue : Int = 200

print(intValue , "is Integer")

// Declaring variables of a certain type

var myBool:Bool = false

var myDouble:Double = 23.45

var myLongInt:Int = 235412452354356

var myvalue:Int = 5/2

//var a1:Double  // error: repl.swift:29:1: error: variables currently must have an initial value when entered at the top level of the REPL var a1:Double

//var a1:Double=nil  

/*error: repl.swift:31:15: error: nil cannot initialize specified type 'Double'

var a1:Double=nil

              ^

repl.swift:31:8: note: add '?' to form the optional type 'Double?'

var a1:Double=nil*/

let a1:Double? = nil 

//myBool+myDouble

/* error: repl.swift:42:7: error: binary operator '+' cannot be applied to operands of type 'Bool' and 'Double'

myBool+myDouble

~~~~~~^~~~~~~~~

repl.swift:42:7: note: expected an argument list of type '(Double, Double)'

myBool+myDouble */