VARIABLES AND CONSTANT

gistfile1.txt

import UIKit

//MARKS:- VARIABLES AND CONSTANTS

/* variables are data stored that can have their value change whenever we want it and constant are value that can not be changed .. advaantage of using var in declaring a variable and let in declaring a constant is that it help xcode to remind us of the constant we have set and whenever we try to change it, it will not xcode will not compile our code and it help to save memory space that is optimization of memory. */

  // create a name variable
   var name = " James Bond"
   // name can be updated without xcode throwing error message and there is no need to redeclare it anymore
    name = "Ade Osun"
  // print what is in the name variable
    print("\(name)")        // Ade Osun is printed instead of James Bond and it is                      //as a result of the variable name been updated

  // let's create variable with let and try to change it
   
    let address = " 17, James Bond Street"
 // address has been alter and xcode will not run this code
     address = "8, Ade Osun Street"