If you have a static variable that never changes and you want that nobody overrides your variable, use the  `const`  keyword by declaration. It makes the variable unchangable (**constsant**). 

For example:

The variable `x` will always be 42 and nobody can change it. The following code would cause an error:

You should declare variables as constants if you are sure that they will probably never change:

```
const int monthPerYear = 12;
const char firstAlphabetLetter = 'A';
```

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In this section, you will learn the most important things about variables manipulations.

In this section, you will learn how booleans can help in creating programs behaving differently depending on some conditions.

In this section, you will learn how to write different loops in C++ to manipulate your data!

In this section, you will learn how the array works and how to apply loops to iterate through the array.

Constant