hello world and variables exploration

hello_world/Cargo.lock

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

hello_world/Cargo.toml

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

hello_world/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

variables/Cargo.lock

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

variables/Cargo.toml

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

variables/src/main.rs

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+//global variables use const or static NOT let and need a type indication
+const NAME : &str = "John";
+const HEX_NUM : &i32 = &0x01;
+
+
+
+fn main() {
+     // local variables dont need a type indication and are by default immutable
+    let local_name = "Dough";
+    let normal_int = 35;
+    let hex_int = 0x35;
+    let bin_int = 0b10101111;
+
+    //make them mutable by mut modifier
+    let mut middle_name = "Levy";
+    println!("temp middle name: {}",middle_name);
+    middle_name = "Cena";
+
+    println!("name: {} {} {}",NAME,middle_name, local_name);
+    println!("age: {}", normal_int);
+    println!("hex: {}",hex_int);
+    println!("const hex: {}",HEX_NUM);
+    println!("binary: {}",bin_int);
+}