Variables

Saving and reusing data effectively in programming often requires the use of variables.

A variable is a named storage location in a computer's memory that holds a value, which can be accessed by name and modified during the execution of a program.

To ensure clear and error-free programming, certain rules must be followed 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.

These rules are specific to R and may not apply to other programming languages.

Choosing meaningful variable names is considered best practice. For instance, naming a variable year to store the value 2020 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:

Tarefa

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

Assign the initial amount of money, 2000, to the variable named initial_money.
Assign the interest rate, 13, to the variable named interest_rate.
Assign the number of years, 4, to the variable named n_years.
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 8

Conteúdo do Curso

R Introduction: Part I