1 files changed, 34 insertions, 0 deletions
diff --git a/exercises/13_error_handling/errors3.rs b/exercises/13_error_handling/errors3.rs
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+++ b/exercises/13_error_handling/errors3.rs
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+// errors3.rs
+//
+// This is a program that is trying to use a completed version of the
+// `total_cost` function from the previous exercise. It's not working though!
+// Why not? What should we do to fix it?
+//
+// Execute `rustlings hint errors3` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+use std::num::ParseIntError;
+
+fn main() {
+    let mut tokens = 100;
+    let pretend_user_input = "8";
+
+    let cost = total_cost(pretend_user_input)?;
+
+    if cost > tokens {
+        println!("You can't afford that many!");
+    } else {
+        tokens -= cost;
+        println!("You now have {} tokens.", tokens);
+    }
+}
+
+pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
+    let processing_fee = 1;
+    let cost_per_item = 5;
+    let qty = item_quantity.parse::<i32>()?;
+
+    Ok(qty * cost_per_item + processing_fee)
+}