回答編集履歴
1
つい癖でiと書いてしまった
test
CHANGED
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@@ -14,7 +14,7 @@
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14
14
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15
15
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int end = sb.charAt(0) == '-' ? 1 : 0;
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16
16
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17
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-
for (int x = sb.length() - 3; x > end;
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17
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+
for (int x = sb.length() - 3; x > end; x -= 3) {
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18
18
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19
19
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sb.insert(x, ',');
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20
20
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