From b9b008c1d4a730335bdc9d465b0fdf7869fb09d4 Mon Sep 17 00:00:00 2001 From: Hunter Kvalevog Date: Sun, 27 Sep 2026 12:11:32 -0500 Subject: rustlings: complete 13 --- rustlings/solutions/13_error_handling/errors3.rs | 34 +++++++++++++++++++++--- 1 file changed, 31 insertions(+), 3 deletions(-) (limited to 'rustlings/solutions/13_error_handling/errors3.rs') diff --git a/rustlings/solutions/13_error_handling/errors3.rs b/rustlings/solutions/13_error_handling/errors3.rs index dcf2377..63f4aba 100644 --- a/rustlings/solutions/13_error_handling/errors3.rs +++ b/rustlings/solutions/13_error_handling/errors3.rs @@ -1,4 +1,32 @@ -fn main() { - // DON'T EDIT THIS SOLUTION FILE! - // It will be automatically filled after you finish the exercise. +// 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? + +use std::num::ParseIntError; + +// Don't change this function. +fn total_cost(item_quantity: &str) -> Result { + let processing_fee = 1; + let cost_per_item = 5; + let qty = item_quantity.parse::()?; + + Ok(qty * cost_per_item + processing_fee) +} + +fn main() -> Result<(), ParseIntError> { + // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ added + 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."); + } + + // Added this line to return the `Ok` variant of the expected `Result`. + Ok(()) } -- cgit v1.2.3