# Template:Significant figures

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## 概要

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