Learning how to print strings in Swift using the C++ stdout printf format specifiers

swift_stings.playground

//  Working with numbers in strings

import UIKit

var str = "Hello, playground"
let myInt:Int = 7;
let myDouble:Double = 8.4;
//  basic
print("The result of \(myInt) multiplied by \(myDouble) is \(Double(myInt) * myDouble)");
//  formating fancy
let result:Double = myDouble * Double(myInt);
//http://www.cplusplus.com/reference/cstdio/printf/
print(String(format: "The result of %4.4d multiplied by %0.2f is %g", myInt, myDouble, result));