MAPPER

In MAPPER (also known as Natural MAPPER), it’s not possible to directly print text like “Hello World!”. MAPPER is primarily used for data manipulation, file processing, and report generation within software like UNISYS MCP systems. It doesn’t support standard programming constructs for outputting strings in the way that languages like Python, C++, or Java do.

However, you can create a simple ‘Hello World!’ program by generating a report with that text. Here’s an example:

DEFINE FILE MYFILE
  RECORD STR(10)  ; Define a record of string type with length 10
END

SET &REPORT = 'Hello World!'  ; Assign "Hello World!" to variable &REPORT

DISPLAY &REPORT ON SYSPRINT  ; Display the content of &REPORT on system print (usually screen)

In this example, we define a file MYFILE with a record length of 10 characters and then assign ‘Hello World!’ to a variable &REPORT. The DISPLAY command is used to output the content of &REPORT to the system’s print device (SYSPRINT, typically the screen).

Please note that this doesn’t exactly mimic the classic “Hello, World!” program in languages like C or Java because MAPPER isn’t designed for such simple text-based outputs. Instead, it focuses on data manipulation and report generation within its environment.

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