Struct HistoryEntry

pub struct HistoryEntry {
    pub input: String,
    pub result: Option<f64>,
    pub error_message: Option<String>,
}

Represents a history entry for a mathematical expression and its result.

Fields

• input: A string containing the original mathematical expression provided by the user.
• result: An optional floating-point number (Option<f64>) representing the calculated result.
• error_message: An optional string (Option<String>) containing an error message if the calculation failed.
• None if there was no error.

This struct is used to log the history of calculations performed by the calculator.

Fields

input: String

result: Option<f64>

error_message: Option<String>

Trait Implementations

impl Clone for HistoryEntry

fn clone(&self) -> HistoryEntry

Returns a duplicate of the value.

const fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HistoryEntry

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.