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Arthur DANJOU
f4120eabdf
- Created empty solution files for various exercises in strings, modules, hashmaps, options, error handling, generics, traits, lifetimes, tests, iterators, smart pointers, threads, macros, clippy, conversions, and quizzes. - Each solution file contains a main function with a comment indicating that it will be automatically filled after completing the exercise. - Added a README.md file to provide information about the solutions and their purpose.
32 lines
931 B
Rust
32 lines
931 B
Rust
// This is a program that is trying to use a completed version of the
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// `total_cost` function from the previous exercise. It's not working though!
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// Why not? What should we do to fix it?
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use std::num::ParseIntError;
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// Don't change this function.
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fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
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let processing_fee = 1;
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let cost_per_item = 5;
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let qty = item_quantity.parse::<i32>()?;
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Ok(qty * cost_per_item + processing_fee)
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}
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// TODO: Fix the compiler error by changing the signature and body of the
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// `main` function.
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fn main() -> Result<(), std::num::ParseIntError> {
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let mut tokens = 100;
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let pretend_user_input = "8";
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// Don't change this line.
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let cost = total_cost(pretend_user_input)?;
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if cost > tokens {
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println!("You can't afford that many!");
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} else {
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tokens -= cost;
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println!("You now have {tokens} tokens.");
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}
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Ok(())}
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