pub struct Fraction {
    num: i64,
    den: i64,
}

#[derive(Debug)]
pub enum FractionError {
    DivisionByZero,
    ZeroDenominator,
    Overflow,
}

impl std::fmt::Display for FractionError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            FractionError::DivisionByZero => write!(f, "Division by zero"),
            FractionError::ZeroDenominator => write!(f, "Denominator can't be zero"),
            FractionError::Overflow => write!(f, "Numeric overflow"),
        }
    }
}

impl std::error::Error for FractionError {}

impl Fraction {
    pub fn new(num: i64, den: i64) -> Result<Self, FractionError> {
        if den == 0 {
            return Err(FractionError::ZeroDenominator);
        }

        Ok(Fraction { num, den })
    }
}

#[cfg(test)]
mod tests {
    use super::*;
}