calculator

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Performs arbitrary-precision arithmetic calculations including addition, subtraction, multiplication, division, and exponents. Use when the user asks to calculate, compute, or evaluate math expressions, or when precise decimal arithmetic is needed to avoid floating-point errors.

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Sourcecode-and-sorts/awesome-copilot-agents

Added on2026-02-11

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npx skill4agent add code-and-sorts/awesome-copilot-agents calculator

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Calculator

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

When to Use

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

Supported Operations

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

Usage

bash

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

Examples

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)

Edge Cases

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

Limitations

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