Advanced Trigonometry Calculator Wiki

Open-source C/C++ math engine for advanced scientific computing

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Advanced Trigonometry Calculator

Advanced Trigonometry Calculator (ATC) is an open-source mathematical calculator and command-line calculator for Windows.

ATC started in 2011 and is created and maintained by Renato Alexandre dos Santos Freitas. The current public release is Advanced Trigonometry Calculator 2.1.7.

Although the project name emphasizes trigonometry, ATC has grown into a broader scientific calculator, equation solver, matrix calculator and polynomial calculator for practical numerical and symbolic/numeric workflows.

What is ATC?

ATC is a native C/C++ mathematical computing engine focused on command-driven calculation.

It supports direct expressions, trigonometry, logarithms, complex numbers, equation solving, polynomial tools, matrix workflows, statistics, DSP functions, unit conversions, scripting and TXT batch processing.

ATC is not intended to be a universal CAS. It is a focused open-source scientific calculator with its own command workflow and documented syntax.

Quick Start

Evaluate a simple expression:

> 2+2

#0=4

Use powers:

> 2^10

#0=1024

Use factorials:

> 5!

#0=120

Use a trigonometric function:

> cos(0)

#0=1

Evaluate a logarithm:

> log(100)

#0=2

Use an engineering constant:

> 2*pi*50

#0=314.159

Use absolute value with ATC negative-number syntax:

> abs(_7)

#0=7

Calculate a root:

> rtD4D(16)

#0=2

Use complex numbers:

> 2i

#0=2i

Use implicit multiplication with complex numbers:

> 3(2i)

#0=6i

Solve numerically:

> solver(x+2)

#0=-2

Solve a polynomial equation:

> solve equation(x^2-5*x+6)

x1=3
x2=2

Simplify a polynomial:

> simplify polynomial((x-2)*(x-3))

(1+0i)x^2+(_5+0i)x^1+(6+0i)

Build a polynomial from roots:

> roots to polynomial(2\3)

(1+0i)x^2+(_5+0i)x^1+(6+0i)

Solve a system of equations:

> solve equations system(1\1\5;1\_1\1)

x1=3
x2=2

Calculate an average:

> avg(2\4\6)

#0=4

Calculate a minimum:

> min(3\_1\2)

#0=-1

Calculate a maximum:

> max(3\_1\2)

#0=3

Run an FFT:

> fft(1\0\0\0)

X[0]=1
X[1]=1
X[2]=1
X[3]=1

Run an inverse FFT:

> ifft(1\1\1\1)

x[0]=1
x[1]=0
x[2]=0
x[3]=0

Key Features

Feature	Status
Equation solver	Supported
Polynomial tools	Supported
Complex numbers	Supported
Matrix operations	Supported
Statistics	Supported
DSP functions	Supported
Unit conversions	Supported
TXT automation	Supported
Documentation	Available
Open source	GPLv3

Main capability areas:

Arithmetic and scientific expressions
Trigonometric and logarithmic functions
Equation solver and numerical solver workflows
Polynomial simplification
Roots-to-polynomial workflows
Complex-number calculations
Matrix creation and matrix helper functions
Statistics helpers such as min, max and avg
DSP functions such as fft and ifft
Physics, geometry, finance and unit-conversion modules
TXT automation and scripting workflows
User functions and script examples

Typical Applications

ATC can be useful in:

Engineering calculations
Education and classroom demonstrations
Scientific computing
Signal processing experiments
Statistics and numerical summaries
Physics calculations
Matrix and polynomial workflows
Batch calculation and TXT automation
Command-line mathematical workflows
Offline technical calculation

Why choose ATC?

ATC is designed for users who want a local, open-source mathematical calculator with a command-line workflow.

Reasons to use ATC:

Native C/C++ performance
Open-source project
Offline command-line calculator workflow
Broad mathematical coverage
Complex numbers support
Matrix engine
Polynomial and equation tools
TXT automation workflows
Scripting and user-function examples
Long-term development since 2011
Lightweight Windows desktop usage
Documentation for users and developers

ATC is especially useful when you want a focused scientific calculator without the overhead of a large mathematical environment.

Project Facts

Item	Information
Project name	Advanced Trigonometry Calculator
Short name	ATC
Started	2011
Current public release	2.1.7
Created by	Renato Alexandre dos Santos Freitas
Maintained by	Renato Alexandre dos Santos Freitas
Main language	C/C++
Platform	Windows desktop application
License	GPLv3
Hosting	SourceForge
Source repository	GitHub mirror/repository available
Documentation	English documentation, with Portuguese documentation where applicable
Online version	ATC Online Alpha / WebAssembly where available
Made in	Portugal

Documentation

Architecture Overview

ATC follows a command-processing architecture.

User Input
   ↓
Command Parser
   ↓
Expression Engine
   ↓
Math Modules
   ├─ Trigonometry
   ├─ Algebra
   ├─ Complex Numbers
   ├─ Matrices
   ├─ Statistics
   ├─ DSP
   └─ Utilities
   ↓
Formatted Output

In practical terms, ATC reads a command or expression, normalizes it, routes it to the correct module, computes the result and prints formatted output.

This architecture supports both interactive use and repeatable TXT automation workflows.

Downloads and Links

Quick links:

Roadmap

Possible future work includes:

Continued maintenance of ATC 2.x
More examples for common engineering and educational workflows
More documentation for matrix and polynomial workflows
More TXT automation examples
Progressive improvement of localized documentation
Continued WebAssembly / ATC Online Alpha work
More testing and regression coverage
Cleaner onboarding for new users
Developer documentation improvements

The project evolves conservatively, with emphasis on documented behavior, repeatable examples and long-term maintainability.

License and Credits

Advanced Trigonometry Calculator is open-source software licensed under GPLv3.

Created and maintained by:

Renato Alexandre dos Santos Freitas

Made in Portugal.

Thanks to the open-source community, SourceForge users and everyone who tests, documents and shares feedback about ATC.

Discussion

alida - 2026-01-15

thanks

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