54 lines
1.4 KiB
Rust
54 lines
1.4 KiB
Rust
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// errors5.rs
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// This program uses a completed version of the code from errors4.
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// It won't compile right now! Why?
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// Execute `rustlings hint errors5` for hints!
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// I AM NOT DONE
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use std::error;
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use std::fmt;
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use std::num::ParseIntError;
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// TODO: update the return type of `main()` to make this compile.
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fn main() -> Result<(), ParseIntError> {
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let pretend_user_input = "42";
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let x: i64 = pretend_user_input.parse()?;
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println!("output={:?}", PositiveNonzeroInteger::new(x)?);
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Ok(())
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}
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// Don't change anything below this line.
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#[derive(PartialEq, Debug)]
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struct PositiveNonzeroInteger(u64);
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#[derive(PartialEq, Debug)]
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enum CreationError {
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Negative,
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Zero,
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}
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impl PositiveNonzeroInteger {
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fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
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match value {
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x if x < 0 => Err(CreationError::Negative),
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x if x == 0 => Err(CreationError::Zero),
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x => Ok(PositiveNonzeroInteger(x as u64))
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}
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}
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}
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// This is required so that `CreationError` can implement `error::Error`.
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impl fmt::Display for CreationError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let description = match *self {
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CreationError::Negative => "Number is negative",
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CreationError::Zero => "Number is zero",
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};
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f.write_str(description)
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}
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}
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impl error::Error for CreationError {}
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