1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
mod input;
pub mod ui;
#[derive(Default)]
pub struct Calculator {
stack: Vec<f64>,
input_buffer: String,
}
impl Calculator {
fn perform_operation(&mut self, op: Operator) {
let rhs = match self.stack.pop() {
Some(f) => f,
None => {
return;
}
};
let lhs = match self.stack.pop() {
Some(f) => f,
None => {
return;
}
};
self.stack.push(match op {
Operator::Add => lhs + rhs,
Operator::Sub => lhs - rhs,
Operator::Mul => lhs * rhs,
Operator::Div => lhs / rhs,
Operator::Exp => lhs.powf(rhs),
});
}
}
pub enum Operator {
Add,
Sub,
Mul,
Div,
Exp,
}
impl Operator {
pub fn parse(c: char) -> Result<Self, ParseOperatorError> {
match c {
'+' => Ok(Self::Add),
'-' => Ok(Self::Sub),
'*' => Ok(Self::Mul),
'/' => Ok(Self::Div),
'^' => Ok(Self::Exp),
_ => Err(ParseOperatorError(c)),
}
}
}
pub struct ParseOperatorError(char);
pub enum Signal {
None,
Exit,
}
|