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Fix inconsistent rounding of 0.5 when formatted to 0 decimal places #102935

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merged 2 commits into from
Nov 16, 2022
Merged

Fix inconsistent rounding of 0.5 when formatted to 0 decimal places #102935

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8487444
Fix inconsistent rounding of 0.5 when formatted to 0 decimal places
ajtribick Oct 11, 2022
aa9837b
Add tests for rounding of ties during float formatting
ajtribick Oct 20, 2022
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2 changes: 1 addition & 1 deletion library/core/src/num/flt2dec/strategy/dragon.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -366,7 +366,7 @@ pub fn format_exact<'a>(
if order == Ordering::Greater
|| (order == Ordering::Equal
// SAFETY: `buf[len-1]` is initialized.
&& (len == 0 || unsafe { buf[len - 1].assume_init() } & 1 == 1))
&& len > 0 && unsafe { buf[len - 1].assume_init() } & 1 == 1)
{
// if rounding up changes the length, the exponent should also change.
// but we've been requested a fixed number of digits, so do not alter the buffer...
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4 changes: 2 additions & 2 deletions library/core/tests/fmt/float.rs
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Expand Up @@ -5,7 +5,7 @@ fn test_format_f64() {
assert_eq!("10", format!("{:.0}", 9.9f64));
assert_eq!("9.8", format!("{:.1}", 9.849f64));
assert_eq!("9.9", format!("{:.1}", 9.851f64));
assert_eq!("1", format!("{:.0}", 0.5f64));
assert_eq!("0", format!("{:.0}", 0.5f64));
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assert_eq!("1.23456789e6", format!("{:e}", 1234567.89f64));
assert_eq!("1.23456789e3", format!("{:e}", 1234.56789f64));
assert_eq!("1.23456789E6", format!("{:E}", 1234567.89f64));
Expand All @@ -31,7 +31,7 @@ fn test_format_f32() {
assert_eq!("10", format!("{:.0}", 9.9f32));
assert_eq!("9.8", format!("{:.1}", 9.849f32));
assert_eq!("9.9", format!("{:.1}", 9.851f32));
assert_eq!("1", format!("{:.0}", 0.5f32));
assert_eq!("0", format!("{:.0}", 0.5f32));
assert_eq!("1.2345679e6", format!("{:e}", 1234567.89f32));
assert_eq!("1.2345679e3", format!("{:e}", 1234.56789f32));
assert_eq!("1.2345679E6", format!("{:E}", 1234567.89f32));
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4 changes: 2 additions & 2 deletions library/core/tests/num/flt2dec/mod.rs
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Expand Up @@ -138,7 +138,7 @@ where

// check exact rounding for zero- and negative-width cases
let start;
if expected[0] >= b'5' {
if expected[0] > b'5' {
try_fixed!(f(&decoded) => &mut buf, expectedk, b"1", expectedk + 1;
"zero-width rounding-up mismatch for v={v}: \
actual {actual:?}, expected {expected:?}",
Expand Down Expand Up @@ -1007,7 +1007,7 @@ where
assert_eq!(to_string(f, 999.5, Minus, 3), "999.500");
assert_eq!(to_string(f, 999.5, Minus, 30), "999.500000000000000000000000000000");

assert_eq!(to_string(f, 0.5, Minus, 0), "1");
assert_eq!(to_string(f, 0.5, Minus, 0), "0");
assert_eq!(to_string(f, 0.5, Minus, 1), "0.5");
assert_eq!(to_string(f, 0.5, Minus, 2), "0.50");
assert_eq!(to_string(f, 0.5, Minus, 3), "0.500");
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