finish chapter 3

1 files changed, 59 insertions, 0 deletions

diff --git a/rust/theBook/chapter-3-variables-and-mutability/practice/convert-temp/src/main.rs b/rust/theBook/chapter-3-variables-and-mutability/practice/convert-temp/src/main.rs
new file mode 100644
index 0000000..971811e
--- /dev/null
+++ b/rust/theBook/chapter-3-variables-and-mutability/practice/convert-temp/src/main.rs
@@ -0,0 +1,59 @@
+use std::io;
+use std::process;
+
+fn read_input() -> i32 {
+    let mut input = String::new();
+
+    io::stdin()
+        .read_line(&mut input)
+        .expect("failed to read line");
+
+    let input = match input.trim().parse() {
+        Ok(input) => input,
+        Err(_) => {
+            println!("not a number!");
+            process::exit(1);
+        },
+    };
+    input
+}
+
+fn main() {
+    println!("Convert temperatures between Fahrenheit and Celsius");
+    println!("");
+
+    loop {
+        println!("Please choose converting method:");
+        println!("1) Fahrenheit to Celsius          2) Celsius to Fahrenheit");
+        println!("3) exit");
+
+        let choice = read_input();
+
+        if choice == 0 {
+            let _choice = read_input();
+        }   else if choice == 1 {
+            fah_to_cel();
+        }   else if choice == 2 {
+            cel_to_fah();
+        }   else if choice == 3 {
+            break
+        };
+    }
+    println!("Thinks for using");
+}
+
+fn fah_to_cel() {
+    println!("Please enter a Fahrenheit temperature");
+    let fah = read_input() as f32;
+
+    println!("the Celsius of {fah} is {}", (fah-32.0)/1.8);
+    println!("");
+}
+
+fn cel_to_fah() {
+    println!("Please enter a Celsius temperature");
+    let cel = read_input() as f32;
+
+    println!("The Fahrenteit of {cel} is {}", cel*1.8+32.0);
+    println!("");
+}