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R Introduction: Part I


Saving and reusing data effectively in programming often necessitates the use of variables. A variable can be thought of as a container that stores data values in computer memory, which can then be referred to by a name assigned to the variable.

In order to ensure clear and error-free programming, certain rules must be observed when naming variables. Here are some guidelines:

  • Variable names must not start with a number or with a period followed by a number.
  • They should not include the % symbol.
  • They must not begin with an underscore _.
  • They can start with a period if it is not followed by a number. It's important to note that these rules can vary across different programming languages.

Choosing meaningful variable names is considered best practice. For instance, naming a variable year to store the value 2020, which represents a year, is more intuitive than using nondescript names like a or b. While this isn't mandatory, it significantly enhances code readability for both the author and others.

To assign a value to a variable, the assignment operator = is used. For example, year = 2020 assigns the value 2020 to the variable named year.


Regarding the deposit task, let's assign the relevant data to variables using the assignment operator:

  1. Assign the initial amount of money, 2000, to the variable named initial_money.
  2. Assign the interest rate, 13, to the variable named interest_rate.
  3. Assign the number of years, 4, to the variable named n_years.
  4. Use the cat() function to display the values of initial_money, interest_rate, and n_years in the order they were created.

Tudo estava claro?

Seção 1. Capítulo 7
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