Do you have access to a (like IBM Z Xplore or Hercules)?
Stores two digits per byte, compressing numeric data while maintaining exact decimal precision. It is the industry standard for financial calculations. Structured Programming Best Practices murachs mainframe cobolpdf
If you use a bootleg 1990s scan, you will learn GO TO statements and missing END-PERFORM syntax that will get your code rejected by a modern compiler. Do you have access to a (like IBM Z Xplore or Hercules)
Whether in print or legitimate PDF, working through Murach’s Mainframe COBOL will teach you: murachs mainframe cobolpdf