injective_math/fp_decimal/
display.rs

1use crate::fp_decimal::FPDecimal;
2use std::fmt;
3
4impl fmt::Display for FPDecimal {
5    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
6        let sign = if self.sign == 0 { "-" } else { "" };
7        let integer = self.int().abs();
8        let fraction = (FPDecimal::_fraction(*self)).abs();
9
10        if fraction == FPDecimal::ZERO {
11            write!(f, "{}{}", sign, integer.num / FPDecimal::ONE.num)
12        } else {
13            let fraction_string = fraction.num.to_string(); //
14            let fraction_string = "0".repeat(FPDecimal::DIGITS - fraction_string.len()) + &fraction_string;
15            let integer_num = integer.num / FPDecimal::ONE.num;
16            f.write_str(sign)?;
17            f.write_str(&integer_num.to_string())?;
18            f.write_str(".")?;
19            f.write_str(fraction_string.trim_end_matches('0'))?;
20
21            Ok(())
22        }
23    }
24}
25
26#[cfg(test)]
27mod tests {
28    use crate::FPDecimal;
29
30    #[test]
31    fn test_fmt_sub() {
32        let input: FPDecimal = FPDecimal::ONE + FPDecimal::from(3u128).div(100i128);
33        assert_eq!(&format!("{input}"), "1.03");
34    }
35
36    #[test]
37    fn test_fmt() {
38        assert_eq!(&format!("{}", FPDecimal::LN_1_5), "0.405465108108164382");
39    }
40
41    #[test]
42    fn test_fmt_neg() {
43        assert_eq!(&format!("{}", -FPDecimal::FIVE), "-5");
44    }
45}
injective_math/fp_decimal/display.rs

injective_math/fp_decimal/
display.rs
