round to even

rust-lang · Nov 9, 2023 · 4e4c972 · 4e4c972
1 parent 33761b0
commit 4e4c972
Show file tree

Hide file tree

Showing 2 changed files with 219 additions and 224 deletions.
diff --git a/library/core/src/fmt/num.rs b/library/core/src/fmt/num.rs
@@ -331,19 331,17 @@ macro_rules! impl_Exp {
  let rem = n % 10;
  n /= 10;
  exponent = 1;
- // round up last digit
- if rem >= 5 {
  // round up last digit, round to even on a tie
  if rem > 5 || (rem == 5 && n % 2 != 0) {
  n = 1;
  // if the digit is rounded to the next power
  // instead adjust the exponent
- if n % 10 == 0 {
  if n.ilog10() > (n - 1).ilog10() {
  n /= 10;
  exponent = 1;
  }
  }
- // n = 100
  }
- // assert!(n == 666, "{}\n{}\n{}\n",n, exponent, added_precision);
  (n, exponent, exponent, added_precision)
  };