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 desktop release is Advanced Trigonometry Calculator 2.1.8.

Although the project name emphasizes trigonometry, ATC has grown into a broader scientific calculator, equation solver, matrix calculator, polynomial calculator and mathematical computing tool 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 computer algebra system. It is a focused scientific and engineering calculator with its own command workflow, documented syntax and long-term compatibility goals.

ATC 2.1.8 continues the stabilization of the 2.x generation, with particular emphasis on compatibility, regression testing, reliability and support for both modern Windows systems and legacy environments.

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
Numerical solver	Supported
Polynomial tools	Supported
Complex numbers	Supported
Matrix operations	Supported
Statistics	Supported
DSP functions	Supported
Unit conversions	Supported
TXT automation	Supported
User functions and scripting	Supported
Regression testing	Extensive
Legacy Windows compatibility	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, access and 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-defined functions and script examples
Command history and reusable calculation workflows
Regression-tested mathematical behavior
Support for legacy and modern Windows systems

What is new in ATC 2.1.8?

ATC 2.1.8 is primarily a stability, compatibility and hardening release.

The release builds on the functionality introduced in previous ATC 2.x versions while improving confidence in the desktop engine through broader regression testing and platform validation.

Major areas of work include:

Solver corrections, including complex-solver behavior
Matrix-related fixes and validation
Improvements to settings handling
Removal of problematic repeated settings application paths
Expanded regression coverage
Dedicated testing modes for solver, TXT, package and settings workflows
Validation of both 64-bit and 32-bit builds
Continued compatibility with Windows XP SP3 through the dedicated x86 legacy build
Validation on modern 64-bit Windows systems
Improved packaging and release documentation
Updated English and Portuguese guides
Improved reproducibility and release validation
Optional Windows Terminal integration scripts without introducing a dependency on Windows Terminal

Representative regression suites include:

All
SolverComplex
Txt
Package
Settings

The ATC 2.1.8 release candidate was extensively smoke-tested on both legacy and current Windows environments before public promotion.

Windows Compatibility

ATC 2.1.8 maintains an unusually broad compatibility range for a modern mathematical calculator.

Validated environments include:

Windows XP SP3 x86 through the dedicated legacy build
Modern Windows x64 systems
Native 64-bit ATC builds
32-bit compatibility builds for appropriate environments

This makes ATC useful in situations where mathematical software must continue operating on old laboratory, industrial, educational or offline systems while still remaining usable on current Windows computers.

The application does not require Windows Terminal. Optional helper scripts can integrate ATC with Windows Terminal where available, while the calculator remains fully usable independently.

Testing and Reliability

ATC 2.1.8 places significant emphasis on regression testing.

Testing covers areas such as:

Core mathematical expressions
Equation solving
Complex-number solving
Polynomial workflows
Matrix behavior
TXT processing
Package-related functionality
Settings behavior
Application startup and smoke testing
Legacy Windows execution
Modern Windows execution

This regression-oriented development model helps ensure that new fixes do not silently break previously supported mathematical behavior.

ATC therefore treats compatibility and repeatability as major engineering goals rather than only adding new mathematical commands.

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
Legacy Windows environments
Laboratory and industrial systems
Reproducible mathematical workflows
Testing mathematical expressions and algorithms

Why choose ATC?

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

Reasons to use ATC include:

Native C/C++ performance
Open-source desktop calculator
Offline operation
Command-line mathematical workflow
Broad mathematical coverage
Complex-number support
Matrix engine
Polynomial and equation tools
Numerical solver
TXT automation workflows
Scripting and user-function examples
Long-term development since 2011
Lightweight Windows desktop usage
Compatibility with both legacy and current Windows systems
Strong regression-testing culture
Documentation for users and developers

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

ATC Desktop and ATC Online

The ATC project now includes two complementary ways of using its mathematical technology.

ATC 2.1.8 Desktop

The desktop edition is the mature native C/C++ implementation for Windows.

It provides:

Native execution
Broad command coverage
TXT workflows
Offline operation
Legacy Windows compatibility
Mature calculator behavior
Long-standing 2.x functionality

ATC Online

ATC Online brings part of the ATC experience to the browser using WebAssembly and supporting browser-side integration.

It allows users to access ATC mathematical workflows without installing the Windows desktop application.

ATC Online includes browser-oriented support for areas such as:

Expressions
Equation solving
Polynomial workflows
Complex arithmetic
Matrix workflows
Session variables
Statistical helpers
Selected ATC commands

The desktop and online editions share the same broader ATC technology direction but are optimized for different environments.

Project Facts

Item	Information
Project name	Advanced Trigonometry Calculator
Short name	ATC
Started	2011
Current desktop release	2.1.8
Created by	Renato Alexandre dos Santos Freitas
Maintained by	Renato Alexandre dos Santos Freitas
Main language	C/C++
Main desktop platform	Windows
Web technology	WebAssembly / JavaScript integration
License	GPLv3 for the ATC 2.x open-source project
Hosting	SourceForge
Source repository	GitHub repository available
Documentation	English documentation, with Portuguese documentation where applicable
Online version	ATC Online
Made in	Portugal

Documentation

Architecture Overview

ATC follows a command-processing architecture.

User Input
   ↓
Command Parser
   ↓
Expression / Command Engine
   ↓
Mathematical Modules
   ├─ Trigonometry
   ├─ Algebra
   ├─ Complex Numbers
   ├─ Equation Solvers
   ├─ Polynomials
   ├─ Matrices
   ├─ Statistics
   ├─ DSP
   ├─ Conversions
   └─ Utilities
   ↓
Formatted Output

In practical terms, ATC reads a command or expression, normalizes and interprets it, routes the operation to the appropriate mathematical subsystem, computes the result and prints formatted output.

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

The broader ATC technology also supports reuse of mathematical functionality in environments such as WebAssembly through ATC Online.

Downloads and Links

Quick links:

Roadmap

Future development is divided between maintaining the mature ATC 2.x generation and developing the next generation of ATC mathematical technology.

Possible future work includes:

Continued maintenance of ATC 2.x
ATC 2.1.9 maintenance and legacy bug fixes
More regression tests
More examples for common engineering and educational workflows
More documentation for matrix and polynomial workflows
Additional TXT automation examples
Progressive improvement of localized documentation
Continued ATC Online development
Continued WebAssembly improvements
Better parity between desktop and browser workflows where practical
Cleaner onboarding for new users
Developer documentation improvements
Continued work on the next-generation ATC architecture

The ATC 2.x branch evolves conservatively, with emphasis on compatibility, documented behavior, repeatable examples, regression testing and long-term maintainability.

Development Philosophy

ATC has been continuously developed since 2011.

Its evolution is based on several principles:

Preserve useful existing behavior
Correct bugs without unnecessarily breaking workflows
Maintain compatibility where technically practical
Test mathematical behavior through regression suites
Keep the calculator usable offline
Document supported commands and workflows
Separate experimental next-generation work from stable public releases
Treat maintainability as seriously as new functionality

ATC 2.1.8 reflects this philosophy particularly well: it is not simply a feature release, but a consolidation of more than a decade of calculator development into a tested and highly compatible Windows release.

License and Credits

Advanced Trigonometry Calculator 2.x 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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