Instruction 1

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Variables

A variable is a named storage location for data. You can store any type of data in a variable. In programming terms, you assign data to variables. Once you assign data to a variable, the variable holds the value of the assigned data. The syntax for declaring variables in Kotlin is straightforward. Open a Kotlin Playground session in your browser. Go to https://play.kotlinlang.org and create a variable called day using the following:

Naming Variables

Always choose clear names for your variables. It’s good practice to name your variables in a simple, self-explanatory manner. In the above example, you can see that the variable’s name gives an idea of the value it contains. By convention, you should name your variables using the lower camel case format. They must begin with letters and include numbers afterward if desired. No other characters are allowed.

Updating Variables

After initially assigning a value to a variable, you have to omit the keyword if you want to update the variable. Otherwise, you’d be re-initializing a variable with the same name, and that’s not allowed. Return to the original example and add a second var, again named day.

Variable Scopes

The context within which a variable is defined is the scope of the variable. They are top-level, class and function scopes in descending order. A top-level variable is available at the same level as the main function or any other top-level class or function in your program.

Using Variables

Write a program that accepts a list of numbers representing daily savings contributions. You’ll supply the daily contributions with program arguments. The program should calculate the total amount and return the total. It will also return the week number in the year.
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