functions, loops and control flow

loops/fibonacci/Cargo.toml

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

loops/fibonacci/src/main.rs

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+use std::io;
+
+fn fib(x: i32) -> i32 {
+    if x == 1 {
+        return 0;
+    } else if x == 2 {
+        return 1;
+    } else {
+        return fib(x - 1) + fib(x - 2);
+    }
+}
+
+fn main() {
+    println!("welcome to the fibo party!");
+    println!("which fibonacci number would you like to see?");
+
+    let mut input = String::new();
+
+    io::stdin()
+        .read_line(&mut input)
+        .expect("error storing user input");
+
+    let input: i32 = input
+        .trim()
+        .parse()
+        .expect("error converting to number: did you enter a non-number?");
+
+    println!("fibonacci number {input} is {}", fib(input));
+}