Template:Significant figures

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概要

此模板提供两个函数，取决于输入。

1. 如果只提供一个参数，该模板计算提供的数字的有效数字。超出10¹²至 10⁻¹²、−10⁻¹²至−10¹²的数字将被忽略。
2. 如果提供两个参数，该模板将第一个数字舍为第二个参数给出的有效数字数。

範例

两个参数

• {{significant figures|123.456|7}} → 123.4560
• {{significant figures|123.456|6}} → 123.456
• {{significant figures|123.456|5}} → 123.46
• {{significant figures|123.456|4}} → 123.5

---

• {{significant figures|123,456|3}} → 123,000
• {{significant figures|12345.6|3}} → 12,300
• {{significant figures|1234.56|3}} → 1,230
• {{significant figures|12.3456|3}} → 12.3
• {{significant figures|1.23456|3}} → 1.23

---

• {{significant figures|.123456|3}} → 0.123
• {{significant figures|.0123456|3}} → 0.0123
• {{significant figures|.00123456|3}} → 0.00123
• {{significant figures|0.123456|3}} → 0.123
• {{significant figures|0.0123456|3}} → 0.0123
• {{significant figures|0.00123456|3}} → 0.00123

---

• {{significant figures|123.456|2}} → 120
• {{significant figures|123.456|1}} → 100
• {{significant figures|123.456|0}} → 0

---

• {{significant figures|987654321|9}} → 987,654,321
• {{significant figures|987654321|8}} → 987,654,320
• {{significant figures|987654321|7}} → 987,654,300
• {{significant figures|987654321|6}} → 987,654,000
• {{significant figures|987654321|5}} → 987,650,000
• {{significant figures|987654321|4}} → 987,700,000
• {{significant figures|987654321|3}} → 988,000,000
• {{significant figures|987654321|2}} → 990,000,000
• {{significant figures|987654321|1}} → 1.0×10⁹

一个参数

• {{significant figures|123400}} → 4
• {{significant figures|12340}} → 4
• {{significant figures|1234}} → 4
• {{significant figures|123.4}} → 4
• {{significant figures|12.34}} → 4
• {{significant figures|1.234}} → 4

---

• {{significant figures|0.1234}} → 4
• {{significant figures|0.01234}} → 4
• {{significant figures|0.001234}} → 4
• {{significant figures|.1234}} → 4
• {{significant figures|.01234}} → 4
• {{significant figures|.001234}} → 4

---

• {{significant figures|-123.4}} → 4
• {{significant figures|-12.34}} → 4
• {{significant figures|-1.234}} → 4

相关模板和模块

• {{Significant figures/rnd}}，使用{{Rnd}}，其使用{{#invoke:Math|precision_format}}
• {{Significant figures/sum}}，使用{{Precision}}，其使用{{#invoke:Math|precision}}
• {{Order of magnitude}}