Elixir Course Online | Prograils - Software Development Company - Integers and Floats

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Integers and Floats

Integer representation

There are four integer representations you can use:

Decimal
```
iex> 1000
1000
```
Hexadecimal
```
iex> 0x1F
31
```
Octal
```
iex> 0o777
511
```
Binary
```
iex> 0b1010
10
```

When you're dealing with a big decimal number, you might want to separate its digits into groups with an underscore. For example: 1000000 equals 1_000_000.

Another cool fact about big numbers is that there is no limit on the size of integers.

Float representation

Documentation

Floating-point numbers have 16 digits of accuracy with the maximum value of 10³⁸. The only requirement for Float data representation is at least one digit before and after the decimal point.

iex> 10.000e1
100.0
iex> 10.5
10.5
iex> 0.82812
0.82812

Arithmetical operators

Elixir supports basic arithmetical operations:

+
```
iex> 5 + 5
10
```
-
```
iex> 5 - 5
0
```
/ - result of this operator is represented by Float type
```
iex> 10 / 10
1.0
```
div - result of this operator is represented by Integer type
```
iex> div(10, 10)
1
```
*
```
iex> 5 * 5
25
```
rem - remainder operator, result will have the same sign as the function’s first argument, which is the only difference comparing to modulo
```
iex> rem(14, 5)
4
iex> rem(-14, 5)
-4
```

Comparison operators

Documentation

In most cases you will use comparison operators for numbers, however it's not a must. In Elixir, comparison is based on type according to rule:

number < atom < reference < function < port < pid < tuple < map < list < binary

List of comparison operators:

value equality
```
iex> 1 == 1
true
iex> 1 == 1.0
true
```
strict equality - checks value and type equality
```
iex> 1 === 1
true
iex> 1 === 1.0
false
```
value inequality
```
iex> 1 != 2
true
```
strict inequality
```
iex> 1 !== 1
false
iex> 1 !== 1.0
true
```
greater than
```
iex> 2 > 1
true
```

greater than or equal to

iex> 2 >= 1
true
iex> 2 >= 2
true
iex> 2 >= 2.5
false

lower than
```
iex> 1 < 2
true
```

lower than or equal to

iex> 1 <= 2
true
iex> 1 <= 1
true
iex> 1 <= 0.5
false