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calculator

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Translation

Chinese

Calculator

计算器

Evaluate arithmetic expressions with arbitrary-precision decimal math using big.js.

使用big.js对算术表达式进行任意精度的十进制数学求值。

When to Use

适用场景

User asks to calculate or evaluate a math expression
Precise decimal arithmetic is needed (avoids floating-point errors like
```
0.1 + 0.2 = 0.30000000000000004
```
)
Expressions involve parentheses, operator precedence, or exponents

用户要求计算或求值数学表达式
需要精确的十进制算术（避免类似
```
0.1 + 0.2 = 0.30000000000000004
```
的浮点错误）
表达式包含括号、运算符优先级或幂运算

Supported Operations

支持的运算

Operator	Description	Precedence
`+`	Addition	1
`-`	Subtraction	1
`*`	Multiplication	2
`/`	Division	2
`^`	Exponent (right-associative)	3
`()`	Parentheses	Highest

运算符	描述	优先级
`+`	加法	1
`-`	减法	1
`*`	乘法	2
`/`	除法	2
`^`	幂运算（右结合）	3
`()`	括号	最高

Usage

使用方法

bash

cd scripts
npm ci || npm install
npm run build
npm run calculate "<expression>"

bash

cd scripts
npm ci || npm install
npm run build
npm run calculate "<expression>"

Examples

示例

Input	Output
`"3 + 2"`	`5`
`"10 / 4"`	`2.5`
`"2 ^ 10"`	`1024`
`"(2 + 3) * 4"`	`20`
`"1 + 4.5 * (3-6) / 5"`	`-1.7`
`"-5 + 3"`	`-2`
`"2 ^ 3 ^ 2"`	`512` (right-associative: 2^9)

输入	输出
`"3 + 2"`	`5`
`"10 / 4"`	`2.5`
`"2 ^ 10"`	`1024`
`"(2 + 3) * 4"`	`20`
`"1 + 4.5 * (3-6) / 5"`	`-1.7`
`"-5 + 3"`	`-2`
`"2 ^ 3 ^ 2"`	`512` （右结合：2^9）

Edge Cases

边缘情况

Empty expression: Throws "Empty expression" error
Mismatched parentheses: Throws "Mismatched parentheses" error
Division by zero: big.js throws an error
Exponent must be integer: big.js
```
.pow()
```
requires integer exponents

空表达式：抛出"Empty expression"错误
括号不匹配：抛出"Mismatched parentheses"错误
除以零：big.js抛出错误
幂运算指数必须为整数：big.js
```
.pow()
```
要求指数为整数

Limitations

局限性

No trigonometric functions (sin, cos, tan)
No variables or symbolic math
Exponents must be integers
No factorial, modulo, or bitwise operators

无三角函数（sin、cos、tan）
不支持变量或符号数学
幂运算指数必须为整数
无阶乘、取模或位运算符