A **`boolean`** in Pascal is used to represent the built-in boolean data type. `boolean` can store one of two values: `true` or `false`. The size of the `boolean` data type is *1 byte*.

# Declaration
The `boolean` data type can be declared as:
```C
variableName: boolean = true;
```
OR:
```C
variableName: boolean = false;
```

# Examples
## Example 1
Consider the code snippet below, which shows the use of the `boolean` data type:


Program fixedRepetetion;
var
   foo: boolean = true;

begin
   foo := false;
   if (foo = true) then
      writeln('Boolean is true')
   else if (foo = false) then
      writeln('Boolean is false');
      
end.

pascal

## Explanation
* *Line 3*: A boolean type variable `foo` is initialized with `true`.
* *Line 6*: `foo` is assigned `false`.
* *Lines 7-10*: Checks whether the value of `foo` is `true` or `false`.
 

## Example 2
Another way to initialize a `boolean` is to initialize it with a comparison expression. If the result of the comparison is `true`, `boolean` is initialized with `true`. If the result of the comparison is `false`, `boolean` is initialized with `false`.


Program fixedRepetetion;
var
   foo: boolean = (5<10);
   foo2: boolean = ('a'='b');
begin

   writeln('foo: ', foo);
   writeln('foo2: ', foo2);
      
end.

pascal.tar.gz

What is boolean in Pascal?

A boolean in Pascal represents a data type storing true or false, declared with 1 byte.