Variables in Kotlin lesson 3

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  Variables in Kotlin 

What are Variables?

Variables in the programming world are addresses in memory that are reserved to store values ​​

To define variables we use one of the key words (var OR val)

Then the name of the variable then the (:) tag then type of  the variable and then assign its value using =

The most important types of variables:

Int: numerical variable

String: Variable Script

Bool: A logical variable that takes either the true value or the false value

Char: Variable Craftsman

Double, float: The decimal variable the difference between is storage capacity

EX:

var name:String = "mark" 

var age:Int = 30 

val distance:double = 3.9

 val pi:double = 3.14 

The difference between var and val is that the variable defined as val remains constant in the program and cannot be changed

while var can change the value of the variable later

Q1: What is the result of the following code:

fun main(args:Array <String>)

 { 

        var name:String = "your name"

        var age:Int = 66

        println(name) 

       print(age) 

} 

Q2: What's wrong ?

fun main(args:Array <String>)

 {  

        val pi:Double = 3.14 

       println(pi) Pi=5.7

       print(pi) 

}

Q3: What is the result of the following code:

fun main (arg:Array <String>)

 { 

       var number:Int = 5

       println(number) 

       number = 8 

      println(number)

 }