COBOL
COBOL (Common Business-Oriented Language) is a compiled programming language designed for business data processing. It was created in 1959 by the CODASYL committee, with significant contributions from Grace Hopper, and was one of the first high-level languages to achieve widespread adoption in commercial computing. COBOL is notable for its English-like syntax, which aimed to make programs self-documenting and accessible to non-technical stakeholders.
The language became the dominant choice for transaction processing on mainframe systems, particularly in banking, insurance, and government sectors. Despite declining use in new development, vast amounts of COBOL code remain in production, running critical systems such as Automated Clearing House networks and Social Security administration. Estimates of active COBOL lines run into the hundreds of billions, and maintenance of these legacy systems continues to be a major industry activity.
History
COBOL was conceived at a meeting of computer manufacturers, users, and academicians in the Pentagon in May 1959. The goal was to create a portable, business‑oriented language that could run on different hardware without modification. The first specification, COBOL‑60, was released in 1960. Subsequent versions added features like conditional statements, sorting capabilities, and report writer functions.
Throughout the 1960s and 1970s, COBOL became the de facto standard for business applications, supported by IBM, UNIVAC, and other vendors. The American National Standards Institute (ANSI) standardized the language in 1968, with revisions in 1974, 1985, and 2002. The 2002 standard introduced object-oriented programming support. In the 1990s, despite the rise of C++ and Java, many enterprises chose to modernize existing COBOL systems rather than replace them, leading to tools for integrating COBOL with web services and modern databases.
Features
COBOL is characterized by a verbose, English‑like syntax that divides a program into four divisions: IDENTIFICATION DIVISION, ENVIRONMENT DIVISION, DATA DIVISION, and PROCEDURE DIVISION. It provides strong support for file handling, including sequential, indexed, and relative file organizations, and includes built‑in capabilities for sorting and report generation.
The language uses fixed‑point decimal arithmetic, avoiding the rounding errors common in binary floating‑point calculations—a critical property for financial applications. COBOL also supports structured programming constructs (e.g., PERFORM loops, IF‑THEN‑ELSE, and EVALUATE) and, in modern standards, object‑oriented syntax.
Legacy and Modern Use
Most major mainframe operating systems, such as IBM z/OS, continue to support COBOL compilers. Tools like Micro Focus COBOL and GnuCOBOL allow development on Linux and Windows. Maintenance and migration of COBOL applications remain a speciality, often involving code analysis and automated conversion to languages like Java or C#.