fix(fmt): fix the case when mantissa exceeds 10 by rounding and expon…

…ent is negative (#5279)
denoland · Jul 4, 2024 · 442a497 · 442a497
1 parent 5303767
commit 442a497
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Showing 2 changed files with 2 additions and 1 deletion.
diff --git a/fmt/printf.ts b/fmt/printf.ts
@@ -718,7 +718,7 @@ class Printf {
       if (10 <= mantissa) {
         mantissa = 1;
         const r = parseInt(esign + e) + 1;
-        e = r.toString();
+        e = Math.abs(r).toString();
         esign = r < 0 ? "-" : "+";
       }
     }

diff --git a/fmt/printf_test.ts b/fmt/printf_test.ts
@@ -110,6 +110,7 @@ Deno.test("sprintf() handles floats", function () {
   assertEquals(sprintf("%.3e", 1.9999), "2.000e+00");
   assertEquals(sprintf("%.3e", 29.99999), "3.000e+01");
   assertEquals(sprintf("%.3e", 999999), "1.000e+06");
+  assertEquals(sprintf("%.3e", 0.000099999), "1.000e-04");
 });
 Deno.test("sprintf() handles floatE", function () {
   assertEquals(sprintf("%E", 4), "4.000000E+00");