www-ivprog/manual_pt/menu_var_variavel-global.html

<div class="w3-item"><img src="img/icn_variaveis.png" title="icone creation of global variable" class="w3-icon icon_32x32" />

<h3>Global Variable</h3>

<p>
The <i>variables</i> are used to store values.
In the case of <i>global variable< i>, it is the whole <i>variable</i> created in the external area of the main program (see image).
This type of variable is <b>recognized</b> at any point in your code, that is, 
within any function, you can use this <i>variable as long as<b> no </b>there is no local variable of the same name</i>!
<bf/>
It is recommended that <b>avoid using this type of variable </b>, as this can lead to confusion in the code.
<bf/>
<center>
  <div style="width: 500px;margin-top:5px"> <img src="img/var_global.png" title="image global variable interface"></div>
</center>
</p>

<p>
When you create a global variable, you can configure the following characteristics:
<ol>
<li><b>Const:</b> although it has the variable name, when we define a variable to be constant, it <b>can not</b> have its initial value changed;</li>
<li><b>Type:</b>  defines the type of information that will be stored in the variable (simple types: integer, real, string or logical, vector: any simple type);</li>
<li><b>Name:</b>  defines the name of the variable, used to trigger it from any part of the program;</li>
<li><b>Value:</b> defines a value to be stored in the variable.</li>
</ol>
</p>

</div>