COBOL
Full course · 21 lessonsCOBOL (Common Business-Oriented Language) powers the worlds business infrastructure — banking systems, insurance claims, government systems, and enterprise transaction processing. Billions of lines of COBOL still run in production today.
Getting Started with COBOL
Divisions, identification, and hello world.
The Four Divisions
Identification, Environment, Data, and Procedure.
Data Types and Pictures
PIC clauses, USAGE, and level numbers.
MOVE and DISPLAY
Data movement and output formatting.
Arithmetic Operations
ADD, SUBTRACT, MULTIPLY, DIVIDE, COMPUTE.
IF and Evaluate
Conditional logic and structured decisions.
PERFORM and Paragraphs
Structured control flow and paragraphs.
Tables and Arrays
OCCURS clauses and table processing.
String Handling
STRING, UNSTRING, and character manipulation.
Sequential File I/O
Open, read, write, and close sequential files.
Sorting Data
SORT verb and file sorting.
Copybooks and Modularity
COPY statements and shared data definitions.
Subprograms and CALL
CALL statements and linkage sections.
Indexed and Relative Files
Random access file organizations.
Report Writing
REPORT SECTION and report generation.
Database Access (SQL/DB2)
Embedded SQL in COBOL.
Debugging COBOL
DISPLAY tracing and testing strategies.
Performance and Optimization
Efficient table and file processing.
Modern COBOL Practices
Date handling and modern standards.
Mainframe and z/OS COBOL
JCL, datasets, and enterprise integration.
Ecosystem and Next Steps
Legacy modernization and career paths.