first commit

variables_mutability/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_mutability"
+version = "0.1.0"

variables_mutability/Cargo.toml

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

variables_mutability/src/main.rs

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+fn main() {
+    //variables by default is unchangable
+    //let is used to define the variables
+    let var1 = String::from("safal lama");
+    println!("default: {}", var1);
+    //mut is used to create a changable variable
+    let mut var2 = String::from("this is safal lama");
+    var2.push_str(". he is a huge fan of goku");
+    println!("mutable: {}", var2);
+
+    //shadowing is a process of redeclaring the variables
+    let var_shade = 1;
+    println!("{}", var_shade);
+    let var_shade = var_shade + 15;
+    println!("{}", var_shade);
+    let var_shade = "Safal lama"; //basically we can directly change the type of variable when shadowing
+    println!("{}", var_shade);
+
+    //constants are not changable and they have to be specified with type annotation
+    const KONST: i32 = 1;
+    println!("{}", KONST); // use caps for betterment
+
+    /*
+    [mutability and refrence]
+    only one mutable reference at a time or a multiple inmutable reference, but not both
+    */
+    let mut str1 = String::from("kakarot");
+    let str2 = &mut str1; //only one mutable as rule 
+    str2.push_str(", i am goku!");
+    println!("{}", str1);
+
+    //[can be multiple]
+    let strx = &str1;
+    println!("{}", strx);
+
+    /* [note]
+    The above code will work despite having mutable and inmutable both however, its about lifetime, cause one ends and other begins, if we didnt printed,     then it wouldnt have worked.
+    */
+}