IBM Mainframe Tutorial

A program is a collection of statements written in a language the computer understands.

A computer executes program statements one after another in sequence until it reaches the end of the program unless some statement in the program alters the order of execution.

Computer Scientists have shown that any program can be written using the three main programming constructs;

Sequence
Selection
Iteration

This section introduces COBOL programming by writing some simple COBOL programs using these constructs.