# ALTRAN

> FORTRAN extension providing rational algebra

**Wikidata**: [Q4652452](https://www.wikidata.org/wiki/Q4652452)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/ALTRAN)  
**Source**: https://4ort.xyz/entity/altran

## Summary
ALTRAN is a FORTRAN extension that provides rational algebra capabilities, developed in 1965 at Bell Telephone Laboratories. It was designed by Douglas McIlroy to enhance FORTRAN with exact rational number arithmetic for scientific computing applications.

## Key Facts
- ALTRAN is a programming language that serves as an extension of FORTRAN
- ALTRAN was developed in 1965 by Bell Telephone Laboratories
- ALTRAN was designed by Douglas McIlroy, an American computer scientist and programmer
- ALTRAN provides rational algebra capabilities, enabling exact rational number arithmetic
- ALTRAN is influenced by both Fortran and PL/I programming languages
- ALTRAN has 5 sitelinks across Wikipedia and other online platforms
- ALTRAN's Wikipedia page is available in English, Italian, Norwegian, Polish, and Portuguese
- ALTRAN represents an early example of specialized language extensions for scientific computing

## FAQs
### Q: What is the purpose of ALTRAN?
A: ALTRAN was created as an extension to FORTRAN to provide rational algebra capabilities, particularly for scientific computing applications requiring exact rational number arithmetic rather than floating-point approximations.

### Q: Who developed ALTRAN and when?
A: ALTRAN was developed in 1965 by Bell Telephone Laboratories, the research and development arm of AT&T. It was specifically designed by Douglas McIlroy, who would later become known for his contributions to Unix and other computing technologies.

### Q: How does ALTRAN differ from standard FORTRAN?
A: Unlike standard FORTRAN which primarily uses floating-point arithmetic, ALTRAN provides specialized capabilities for rational algebra, enabling exact computation with rational numbers. This makes ALTRAN particularly useful for applications where precision is critical and floating-point errors could be problematic.

### Q: Is ALTRAN still used today?
A: ALTRAN was developed in the 1960s as a specialized FORTRAN extension. Given its age and the evolution of programming languages and computing technology, it is no longer in active use. However, it remains historically significant as an early example of language extensions for mathematical computing.

## Why It Matters
ALTRAN represents an important milestone in the history of scientific computing and programming language development. As one of the early specialized extensions to FORTRAN, it addressed the critical need for exact rational arithmetic in scientific applications where floating-point approximations could introduce significant errors. Its development at Bell Laboratories, a pioneering institution in computing research, underscores its significance in the evolution of specialized programming languages for mathematical applications. ALTRAN exemplifies the era of innovation where language extensions were developed to address specific computational challenges, contributing to the broader understanding of mathematical computing and language design principles. While not widely known today, ALTRAN's historical significance is preserved through its documentation in multiple languages and its inclusion in the computing history canon.

## Notable For
- ALTRAN was one of the first FORTRAN extensions to provide specialized rational algebra capabilities for exact arithmetic
- It was developed at Bell Telephone Laboratories, an institution renowned for its contributions to computing technology
- ALTRAN was designed by Douglas McIlroy, who would later become known for his contributions to Unix and other computing technologies
- The language supports exact rational arithmetic, distinguishing it from standard FORTRAN's floating-point operations
- ALTRAN has been preserved with Wikipedia entries in multiple languages (English, Italian, Norwegian, Polish, Portuguese), indicating its historical significance in computing history

## Body
### Development
ALTRAN was developed in 1965 by Bell Telephone Laboratories, a research and scientific development company headquartered in Murray Hill, New Jersey. The language was designed by Douglas McIlroy, an American computer scientist, mathematician, engineer, and programmer who would later become known for his contributions to Unix and other computing technologies. Bell Labs, established in 1925, had a long history of innovation in computing and telecommunications, providing an ideal environment for the development of specialized programming languages like ALTRAN.

### Technical Design
ALTRAN is an instance of a programming language and specifically a FORTRAN extension providing rational algebra capabilities. It was influenced by both Fortran and PL/I, incorporating elements from these languages while adding specialized functionality for exact rational arithmetic. The language's design addressed the limitations of standard FORTRAN's floating-point arithmetic in applications requiring precise mathematical computations, where floating-point approximations could lead to significant errors in scientific calculations.

### Historical Context
During the 1960s, programming languages were evolving rapidly to meet the growing demands of scientific and engineering computing. ALTRAN emerged as part of this trend, focusing on enhancing FORTRAN with mathematical capabilities that were not natively supported. This period saw numerous specialized language extensions developed to address specific computational challenges, reflecting the specialized needs of different scientific fields and the limitations of general-purpose languages of the time.

### Current Status
Today, ALTRAN has minimal active use given its age and the evolution of computing technology. However, it maintains historical significance with 5 sitelinks across Wikipedia and other platforms, with available entries in English, Italian, Norwegian, Polish, and Portuguese. The language remains documented as an early example of FORTRAN extensions for rational algebra computing, serving as a reference point for understanding the evolution of programming languages for mathematical applications.

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