Cn Math Expression

cn math expression

Math Expression Evaluator

Safely evaluate mathematical expressions with support for common functions.

Features

• Safe evaluation (no arbitrary code execution)
• Common mathematical functions: sqrt, sin, cos, tan, log
• Constants: pi, e
• Basic arithmetic: +, -, *, /, **, %
• Pure Python, no external dependencies

Supported Functions

Function	Description	Example
sqrt(x)	Square root	sqrt(144) = 12
sin(x)	Sine (radians)	sin(pi/2) = 1
cos(x)	Cosine (radians)	cos(0) = 1
tan(x)	Tangent (radians)	tan(pi/4) = 1
log(x)	Natural log	log(e) = 1
log10(x)	Base 10 log	log10(100) = 2
abs(x)	Absolute value	abs(-5) = 5
pow(x,y)	Power	pow(2,8) = 256

Supported Constants

• pi = 3.141592653589793
• e = 2.718281828459045

Usage Examples

# Basic arithmetic
python3 scripts/math_eval.py --expr "2 + 3 * 4"
# Result: 14

# Using functions
python3 scripts/math_eval.py --expr "sqrt(144) + pow(2, 10)"
# Result: 1028.0

# Constants
python3 scripts/math_eval.py --expr "2 * pi * 10"
# Result: 62.8318...

# Complex expression
python3 scripts/math_eval.py --expr "log(pow(e, 5)) + sqrt(81)"
# Result: 14.0

Safety

The evaluator uses Python's eval() with a restricted namespace. Only mathematical functions and constants are available. No imports, no file access, no system commands.

Error Handling

If the expression is invalid or contains unsafe operations:

{"error": "name 'os' is not defined"}

Exit code 1 on error.

Technical Details

• Language: Python 3
• Dependencies: None (standard library only)
• License: MIT-0