Table of Contents📚
Variable data types
What are data types❓
When we declare a variable, for example :
let x = 5;
The value of x is 5, and 5 is, of course, a number. But more precisely, 5 is of type i32, which means its an 32-bit signed integer.
ℹ️ An unsigned integer is an integer that is always positive, whereas a signed integer is an integer that can be positive or negative.
There are many other data types in Rust.
i8, i16... -> signed integers 🔢
u8, u16... -> unsigned integers 🔢
f32, f64 -> floating point numbers 🔢
char -> a single character 🔤
bool -> either true or false 👍👎
String -> a sequence of characters ✍️
Specifying data types
When we declare a variable, we don’t need to specify its type like in other languages like Java or C, because Rust is an autotyped language, which means that rust will automatically determine the type of the variable.
But, if we want to specify the type of the variable, we can do it with the following syntax:
let x: type = value;
for example:
let x: i32 = 5;
You should always specify the type of the variable, because it is a good practice to avoid errors.
for example, if you know that x will never be negative, you can write:
let x: u32 = 1;