v0.0.2 chap3.2 datatypes scalar

datatypes/.gitignore

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+/target

datatypes/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "datatypes"
+version = "0.1.0"

datatypes/Cargo.toml

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+[package]
+name = "datatypes"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

datatypes/src/main.rs

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+fn main() {
+    println!("
+Rust is a statically typed language.
+
+There are 2 subsets of datatypes: scalar and compound.
+
+1/ Scalar types
+
+Scalar types represents a single value.
+
+Rust has: integers, floating-point numbers, 
+Boolean and characters
+
+1.1/ integers can be signed or unsigned and 
+     size from 8 bits to 128 bits,
+     or have a size depending of the arch.
+     Default type is i32.
+     i8 ranges from -(2⁷) to 2⁷ - 1, ie -128 to 127
+
+     let x: u32 = 3000;
+     let x: i32 = -230_000; // equals -230000
+     let x: u16 = 0xff;     // hexa form for 255
+     let x: usize = 0b1111_0000; // binary form
+     let x: u8 = b'A'; // byte form only u8
+
+1.2/ Floating-point types can be f32 or f64,
+     default to f64:
+
+     let x = 2.0; // f64
+     let x: f32 = 3.0; // f32 
+
+     Support basic mathematical operations:
+         
+     let sum = 3.4 + 5.6;
+     let difference = 90_000 - 289;
+     let product = 4 * 30;
+     let quotient = 56.7 / 32.2;
+     let truncated = -5 / 3;
+     let remainder = 43 % 5;
+
+1.3/ Boolean:
+    
+     let t: bool = true;
+
+1.4/ A `char` is 4 bytes in rust and covers unicode:
+
+     let mut c: char = 'z'  // note the single quote
+     c = '🤗'
+
+     ");
+}
+