圆四舍四点计算器
向上或向下任意小数位数的圆数。
输入结果时更新 。
关于此计算器
A rounding calculator rounds a number to a chosen number of decimal places (or significant figures) and shows four results side by side: the standard nearest-value rounding, always-up (ceiling), always-down (floor), and truncation, so you can compare every option at once.
Standard rounding looks at the digit just past the cut-off — 5 or more rounds up, less than 5 rounds down — so 3.14159 to two decimal places is 3.14. The other columns force a direction: for 2.673 the nearest and floor both give 2.67 while the ceiling gives 2.68, and truncation simply drops the extra digits to 2.67 without rounding. Switching the mode to significant figures counts meaningful digits from the first non-zero one instead, and a negative number of places rounds to the left of the point, so 3457 to −2 places becomes 3500.
Rounding matters for money, measurements, reporting to a sensible precision, and avoiding false accuracy in results. Seeing nearest, up, down and truncated together makes it clear how much a value shifts depending on which rule you apply.
经常问到的问题
舍入小数点怎么用?
距离截断点刚刚过5次或更多次, 不到5次。 3.14159到2个位数是3.14。
小数点位数的负数能做什么?
它从小数点左转至:-1发至最接近的10发,-2发至最接近的100发。 3457至-2位是3500。
围成两半又有什么区别?
圆圈(上限)总是向大值移动,向小(底)向小(底)向下,而最近的取数则以较近者为准。对于2.673到两个地方,最近和最接近的取数给2.67,但向上给予2.68。
被删减的结果显示什么?
它将数字切除到您所选择的位置之外, 完全不四舍五入。 2. 673 位小数后被短减到小数点后两位位数是2.67, 尽管最近的四舍五入也给您带来2.67, 并且2.678 将短减到2.67, 圆数则为2.68。
如何绕到重要数字而不是小数点位数?
模式从小数位转换为重要数字。 精确度为 3, 保留前三个有意义的数字, 即 0.0045213 变为 0.00452。
围捕总是会使数字更大吗?
仅对正数。 归并意味着正无穷, 所以 - 2. 7 舍入到整数是-2, 更大, 较小 。
API - 使用代码中的计算器
将此计算器称为自由 JSON 端点 。 不需要按键 。 将字段值发送到下面作为查询参数或 JSON 。 任何您省略的, 都会使用相同的默认值, 此页面预填的默认值是预填的; 未知参数是 400, 而不是静音零 。 读取 API 全部文件 →
终点
GET https://calculator.free/api/v1/rounding/curl
curl "https://calculator.free/api/v1/rounding/?number=3.14159&places=2&mode=decimals"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/rounding/?" + new URLSearchParams({
"number": "3.14159",
"places": "2",
"mode": "decimals"
}));
const data = await r.json();
console.log(data.results);成果仅是一般指导的估计数,而不是财务、医疗或税务咨询。