first commit

erro-handling/Cargo.lock

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

erro-handling/Cargo.toml

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+[package]
+name = "erro-handling"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

erro-handling/README.md

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+# for quick prototyping:
+- let file = File::open("hello.txt").unwrap(); //panics
+- let file = File::open("hello.txt").expect("Failed to open") // custom error

erro-handling/src/main.rs

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+use std::{fs::File, io::{self, Read}};
+
+//Error handling in Rust is a critical Aspect of writing reliable and robust programs. Rust
+//encuorages handling errors explicity and provides two main types
+// - panic! macro -> for unrecovable errors 
+// - Result<T,E> enum -> for recovable errors
+fn main() {
+    //always use panic when something goes wrong that the program cannot continue 
+    // let num = vec![1,2,3];
+    // println!("{}", num[99]); //panics cus the index is out of bound!
+            
+    //Result type is used to handle operations that can succeed or fail like file I/O 
+    match read_file("hello.txt"){
+        Ok(contents)=> println!("{}", contents),
+        Err(e)=> eprint!("Erro readihg file: {}",e)
+    }
+
+
+
+}
+
+fn read_file(filename: &str)-> Result<String, io::Error>{
+    let mut file = File::open(filename)?;
+    let mut contents = String::new();
+    file.read_to_string(&mut contents)?;
+    Ok(contents)
+}