# Primitive Types

Move has few built-in primitive types to represent numbers, addresses and boolean values: integers (u8, u64, u128), `boolean` and `address`.

Move does not have string type or floating point numbers.

## Integer types

Integers are represented by `u8`, `u64` and `u128`; Possible integer notations are:

``````script {
fun main() {
// define empty variable, set value later
let a: u8;
a = 10;

// define variable, set type
let a: u64 = 10;

// finally simple assignment
let a = 10;

// simple assignment with defined value type
let a = 10u128;

// in function calls or expressions you can use ints as constant values
if (a < 10) {};

// or like this, with type
if (a < 10u8) {}; // usually you don't need to specify type
}
}
``````

### Operator `as`

When you need to compare values or when function argument requires integer of different size you can cast your integer variable to another size by using operator `as`:

``````script {
fun main() {
let a: u8 = 10;
let b: u64 = 100;

// we can only compare same size integers
if (a == (b as u8)) abort 11;
if ((a as u64) == b) abort 11;
}
}
``````

## Boolean

Boolean type is just the one you're used to. Two constant values: `false` and `true` - both can only mean one thing - a value of `bool` type.

``````script {
fun main() {
// these are all the ways to do it
let b : bool; b = true;
let b : bool = true;
let b = true
let b = false; // here's an example with false
}
}
``````

Address is an identifier of sender (or wallet) in blockchain. The very basic operations which require address type are sending coins and importing modules.

``````script {
fun main() {