functions, loops and control flow

loops/tempverter/src/main.rs

@@ -0,0 +1,49 @@
+use std::io;
+
+fn main() {
+    println!("welcome to tempverter!");
+    println!("please enter your temp:");
+
+    let mut input = String::new();
+
+    io::stdin()
+        .read_line(&mut input)
+        .expect("error storing user input");
+
+    let input: i32 = input
+        .trim()
+        .parse()
+        .expect("error storing temperature - did you enter a number?");
+
+    println!("DEBUG: you entered {input}");
+
+    println!("is this in C or F?");
+
+    let mut input_unit = String::new();
+
+    io::stdin()
+        .read_line(&mut input_unit)
+        .expect("error storing user input");
+
+    let input_unit: char = input_unit
+        .trim()
+        .parse()
+        //NOTE: it won't panic when you enter a number
+        //because char is an unsigned 32-bit integer
+        //so it will akshually panic when you enter a negative number
+        .expect("error storing temperature unit - did you enter a char?");
+
+    if input_unit == 'c' || input_unit == 'C' {
+        println!("{input}C is {}F", converter(input, 1));
+    } else if input_unit == 'f' || input_unit == 'F' {
+        println!("{input}F is {}C", converter(input, 2));
+    }
+}
+
+fn converter(input: i32, choice: i32) -> i32 {
+    if choice == 1 {
+        return 32 + ((9 * input) / 5);
+    } else {
+        return ((input - 32) / 9) * 5;
+    }
+}