フロア機能
下限は常に負の無限大に向かって下向きに切り捨てられます。これは負の数の場合に特に重要です。
四捨五入計算機
数値を入力し、丸め設定を選択します
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🪄 簡単な例
📋 How It Works
仕組み
1
Step 1
Choose the target precision or place value.
2
Step 2
Drop extra digits and move downward toward negative infinity.
3
Step 3
Return a value that is never greater than the original at that precision.
📊 Examples
実用例
Examples highlight where floor and truncate differ on negatives.
| 入力 | ターゲット | 方法 | 結果 |
|---|---|---|---|
| 2.99 | 最も近い整数 | 切り捨て（床） | 2 |
| -2.01 | 最も近い整数 | 切り捨て（床） | -3 |
| 12.309 | 最も近い百番目 (2 dp) | 切り捨て（床） | 12.30 |
ヒント
よくある間違い
Avoid these frequent rounding errors when validating outputs.
- Treating floor as simple digit cut-off.
- Expecting floor to behave like nearest rounding.
- Using floor when toward-zero behavior is required.
- Ignoring sign when validating test results.
❓ よくある質問
よくある質問
Is floor the same as truncate?
No. Floor moves toward negative infinity while truncate moves toward zero.
How does floor work for negatives?
Negative numbers become more negative whenever there is a remainder.
When is floor useful?
Floor is useful for conservative lower-bound calculations.
Can I compare floor and ceiling quickly?
Yes. Related links let you test the same inputs under both methods.