test.swift

extension Int {
   var add: Int {return self + 100 }
   var sub: Int { return self - 10 }
   var mul: Int { return self * 10 }
   var div: Int { return self / 5 }
}
    
let addition = 3.add
println("Addition is \(addition)")
    
let subtraction = 120.sub
println("Subtraction is \(subtraction)")
    
let multiplication = 39.mul
println("Multiplication is \(multiplication)")
    
let division = 55.div
println("Division is \(division)")

let mix = 30.add + 34.sub
println("Mixed Type is \(mix)")