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std.fmt: fix incorrect rounding on 0 precision of a decimal

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Leo Emar-Kar 2024-03-16 23:38:46 +00:00 • committed by GitHub
parent 242ab81112
commit f88a971e4f
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1 changed files with 9 additions and 1 deletions
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10
lib/std/fmt/ryu128.zig
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@ -2,6 +2,7 @@
//! https://dl.acm.org/doi/pdf/10.1145/3360595
const std = @import("std");
const expectFmt = std.testing.expectFmt;
const special_exponent = 0x7fffffff;
@ -131,7 +132,7 @@ fn round(f: FloatDecimal128, mode: RoundMode, precision: usize) FloatDecimal128
switch (mode) {
.decimal => {
if (f.exponent >= 0) {
if (f.exponent > 0) {
round_digit = (olength - 1) + precision + @as(usize, @intCast(f.exponent));
} else {
const min_exp_required = @as(usize, @intCast(-f.exponent));
@ -1129,3 +1130,10 @@ test "format f128" {
try check(f128, 9.409340012568248e18, "9.409340012568248e18");
try check(f128, 1.2345678, "1.2345678e0");
}
test "format float to decimal with zero precision" {
try expectFmt("5", "{d:.0}", .{5});
try expectFmt("6", "{d:.0}", .{6});
try expectFmt("7", "{d:.0}", .{7});
try expectFmt("8", "{d:.0}", .{8});
}