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rustlings/solutions/13_error_handling/errors3.rs
2024-06-26 15:44:33 +02:00

32 lines
919 B
Rust

// 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<i32, ParseIntError> {
let processing_fee = 1;
let cost_per_item = 5;
let qty = item_quantity.parse::<i32>()?;
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(())
}