1 files changed, 58 insertions, 0 deletions
diff --git a/src/calculator.rs b/src/calculator.rs
new file mode 100644
index 0000000..eab3ac8
--- /dev/null
+++ b/src/calculator.rs
@@ -0,0 +1,58 @@
+use std::error::Error;
+use std::fmt;
+use std::io;
+use std::process;
+
+#[derive(Debug)]
+struct UnknownOperatorError;
+
+impl Error for UnknownOperatorError {}
+
+impl fmt::Display for UnknownOperatorError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "invalid operator!")
+    }
+}
+
+fn get_input() -> String {
+    let mut res = String::new();
+    io::stdin()
+        .read_line(&mut res)
+        .expect("failed to get input!");
+
+    return (*res).trim().to_string();
+}
+
+fn get_number() -> f32 {
+    get_input()
+        .parse::<f32>()
+        .expect("failed to get your number (possible lack of rizz)")
+}
+
+fn calculate(operator: &String, number1: &f32, number2: &f32) -> Result<f32, UnknownOperatorError> {
+    match operator.as_str() {
+        "+" => Ok(number1 + number2),
+        "-" => Ok(number1 - number2),
+        "/" => Ok(number1 / number2),
+        "*" => Ok(number1 * number2),
+        _ => Err(UnknownOperatorError),
+    }
+}
+
+fn main() {
+    println!("enter a number: ");
+    let number1 = get_number();
+    println!("enter an operator: ");
+    let operator = get_input();
+    println!("enter another number: ");
+    let number2 = get_number();
+
+    let res = calculate(&operator, &number1, &number2);
+    match res {
+        Ok(i) => println!("{i}"),
+        Err(e) => {
+            eprintln!("{e}");
+            process::exit(1);
+        }
+    }
+}