PL/I Counter and Theme Toggle - Pli Typing CST Test

Mode:

Duration:

DECLARE count FIXED BINARY(31) INITIAL(0);
DECLARE isDark BIT(1) INITIAL('0'B);

UPDATEUI: PROCEDURE OPTIONS(MAIN);
	PUT SKIP LIST('Counter: ', count);
	IF isDark = '1'B THEN
		PUT SKIP LIST('Theme: Dark');
	ELSE
		PUT SKIP LIST('Theme: Light');
	END;
END UPDATEUI;

INCREMENT: PROCEDURE;
	count = count + 1;
	CALL UPDATEUI();
END INCREMENT;

DECREMENT: PROCEDURE;
	count = count - 1;
	CALL UPDATEUI();
END DECREMENT;

RESET: PROCEDURE;
	count = 0;
	CALL UPDATEUI();
END RESET;

TOGGLETHEME: PROCEDURE;
	IF isDark = '0'B THEN
		isDark = '1'B;
	ELSE
		isDark = '0'B;
	END;
	CALL UPDATEUI();
END TOGGLETHEME;

/* Simulate actions */
CALL UPDATEUI();
CALL INCREMENT();
CALL INCREMENT();
CALL TOGGLETHEME();
CALL DECREMENT();
CALL RESET();Coding works best on desktop or with an external keyboard.

PL/I Counter and Theme Toggle — Pli Code

Demonstrates a simple counter with theme toggling using PL/I variables and procedures.

DECLARE count FIXED BINARY(31) INITIAL(0);
DECLARE isDark BIT(1) INITIAL('0'B);

UPDATEUI: PROCEDURE OPTIONS(MAIN);
	PUT SKIP LIST('Counter: ', count);
	IF isDark = '1'B THEN
		PUT SKIP LIST('Theme: Dark');
	ELSE
		PUT SKIP LIST('Theme: Light');
	END;
END UPDATEUI;

INCREMENT: PROCEDURE;
	count = count + 1;
	CALL UPDATEUI();
END INCREMENT;

DECREMENT: PROCEDURE;
	count = count - 1;
	CALL UPDATEUI();
END DECREMENT;

RESET: PROCEDURE;
	count = 0;
	CALL UPDATEUI();
END RESET;

TOGGLETHEME: PROCEDURE;
	IF isDark = '0'B THEN
		isDark = '1'B;
	ELSE
		isDark = '0'B;
	END;
	CALL UPDATEUI();
END TOGGLETHEME;

/* Simulate actions */
CALL UPDATEUI();
CALL INCREMENT();
CALL INCREMENT();
CALL TOGGLETHEME();
CALL DECREMENT();
CALL RESET();

Pli Language Guide

PLI (Programming Language One) is a procedural, compiled language designed for business and systems programming, particularly for large-scale data processing and legacy IBM mainframe environments.

Primary Use Cases

▸Large-scale batch processing
▸Business and financial systems
▸Mainframe application maintenance
▸Data processing for enterprises
▸Legacy system integration and updates

Notable Features

▸Structured programming constructs
▸Strong support for record and array data types
▸Compiled for IBM mainframes
▸Integrated input/output for batch processing
▸Efficient memory and file handling

Origin & Creator

Developed by IBM in the 1960s, primarily as a high-level language for business and systems applications on mainframe computers.

Industrial Note

PLI remains in use in legacy IBM mainframe environments for maintaining mission-critical financial and administrative systems.

Quick Explain

▸PLI was created to handle structured programming for commercial applications on IBM mainframes.
▸It combines features from FORTRAN and ALGOL, with strong support for structured control, record handling, and input/output.
▸It was widely used in banking, insurance, and enterprise resource planning systems due to its reliability and performance on mainframes.

Core Features

▸Procedures and subroutines
▸Arrays, tables, and records
▸Structured loops and conditionals
▸Built-in file and print handling
▸Static typing with mainframe-optimized compilation

Learning Path

▸Understand mainframe environment and JCL
▸Learn basic PLI syntax and procedures
▸Practice arrays, records, and tables
▸Develop small batch processing programs
▸Study legacy systems and integration patterns

Practical Examples

▸Generating financial reports
▸Processing customer records in batch
▸Updating mainframe database entries
▸Calculating payroll or invoices
▸Integrating with legacy enterprise systems

Comparisons

▸More structured than early COBOL
▸Optimized for mainframe batch processing
▸Less portable than modern languages
▸Similar purpose as PL/I but IBM-focused
▸Strong legacy presence in banking and enterprise

Strengths

▸Highly reliable for business-critical applications
▸Optimized for IBM mainframes
▸Structured syntax reduces errors
▸Good for batch and report processing
▸Supports modular programming with procedures

Limitations

▸Mainframe-dependent and outdated for modern platforms
▸Limited modern tooling or IDE support
▸Not suitable for web, mobile, or GUI applications
▸Smaller community compared to modern languages
▸Steeper learning curve for new programmers

When NOT to Use

▸Modern web, mobile, or GUI applications
▸Cross-platform development outside IBM mainframes
▸Rapid prototyping or scripting tasks
▸Machine learning or modern data analytics
▸Systems requiring modern community support or libraries

Cheat Sheet

▸DECLARE x FIXED BIN(31); - declare integer variable
▸DECLARE rec RECORD (field1 FIXED BIN(31), field2 CHAR(10));
▸PROCEDURE name(); - define procedure
▸IF condition THEN … ELSE … ENDIF; - conditional
▸DO i = 1 TO 10; … ENDDO; - loop

FAQ

▸Is PLI still used?
▸Yes, primarily for legacy IBM mainframe systems.
▸Can PLI handle modern computing tasks?
▸Not efficiently; it is optimized for batch and enterprise processing.
▸Is PLI portable?
▸Mostly limited to IBM mainframe environments.
▸Does PLI support structured programming?
▸Yes, with procedures, loops, and conditionals.
▸What industries still use PLI?
▸Banking, insurance, government, and other mainframe-reliant sectors.

30-Day Skill Plan

▸Week 1: PLI syntax and variable types
▸Week 2: Arrays, records, and tables
▸Week 3: Procedures and modular routines
▸Week 4: Batch job creation and execution
▸Week 5: Enterprise mainframe application maintenance

Final Summary

▸PLI is a procedural, compiled language optimized for IBM mainframes.
▸Used for structured business and batch processing applications.
▸Strong support for records, arrays, and modular procedures.
▸Mostly relevant today for legacy enterprise systems.
▸Combines reliability, structured programming, and mainframe efficiency.

Project Structure

▸Source/ - PLI source files
▸Bin/ - compiled object code
▸Lib/ - mainframe runtime libraries
▸Docs/ - documentation and specifications
▸Jobs/ - JCL scripts for batch execution

Monetization

▸Enterprise legacy system maintenance
▸Banking and financial software support
▸Mainframe consulting and modernization
▸Educational material for mainframe programming
▸Historical study of procedural languages

Productivity Tips

▸Use modular procedures to reduce redundancy
▸Document batch job steps
▸Leverage record structures for clarity
▸Test small modules before full job submission
▸Maintain consistent naming conventions

Basic Concepts

▸Variables, constants, and data types
▸Procedures and modular routines
▸Arrays, records, and tables
▸Structured control flow: IF, DO, LOOP
▸Input/output and batch processing

Official Docs

▸IBM PL/I Language Reference
▸IBM mainframe PLI compiler manuals
▸Enterprise batch processing documentation

More Pli Typing Exercises

PL/I Random Number Generator PL/I Todo List PL/I Dice Roller PL/I Countdown Timer PL/I Prime Checker PL/I Temperature Converter PL/I Shopping Cart PL/I Name Greeting PL/I Stopwatch

Practice Other Languages

C React Python C++Rust TypeScript Kotlin PHP Java C#Ruby Mql Cql N1ql Cypher

DECLARE count FIXED BINARY(31) INITIAL(0);
DECLARE isDark BIT(1) INITIAL('0'B);

UPDATEUI: PROCEDURE OPTIONS(MAIN);
PUT SKIP LIST('Counter: ', count);
IF isDark = '1'B THEN
PUT SKIP LIST('Theme: Dark');
ELSE
PUT SKIP LIST('Theme: Light');
END;
END UPDATEUI;

INCREMENT: PROCEDURE;
count = count + 1;
CALL UPDATEUI();
END INCREMENT;

DECREMENT: PROCEDURE;
count = count - 1;
CALL UPDATEUI();
END DECREMENT;

RESET: PROCEDURE;
count = 0;
CALL UPDATEUI();
END RESET;

TOGGLETHEME: PROCEDURE;
IF isDark = '0'B THEN
isDark = '1'B;
ELSE
isDark = '0'B;
END;
CALL UPDATEUI();
END TOGGLETHEME;

/* Simulate actions */
CALL UPDATEUI();
CALL INCREMENT();
CALL INCREMENT();
CALL TOGGLETHEME();
CALL DECREMENT();
CALL RESET();

Coding works best on desktop or with an external keyboard.

PL/I Counter and Theme Toggle — Pli Code

Demonstrates a simple counter with theme toggling using PL/I variables and procedures.

DECLARE count FIXED BINARY(31) INITIAL(0); DECLARE isDark BIT(1) INITIAL('0'B); UPDATEUI: PROCEDURE OPTIONS(MAIN); PUT SKIP LIST('Counter: ', count); IF isDark = '1'B THEN PUT SKIP LIST('Theme: Dark'); ELSE PUT SKIP LIST('Theme: Light'); END; END UPDATEUI; INCREMENT: PROCEDURE; count = count + 1; CALL UPDATEUI(); END INCREMENT; DECREMENT: PROCEDURE; count = count - 1; CALL UPDATEUI(); END DECREMENT; RESET: PROCEDURE; count = 0; CALL UPDATEUI(); END RESET; TOGGLETHEME: PROCEDURE; IF isDark = '0'B THEN isDark = '1'B; ELSE isDark = '0'B; END; CALL UPDATEUI(); END TOGGLETHEME; /* Simulate actions */ CALL UPDATEUI(); CALL INCREMENT(); CALL INCREMENT(); CALL TOGGLETHEME(); CALL DECREMENT(); CALL RESET();

Pli Language Guide

PLI (Programming Language One) is a procedural, compiled language designed for business and systems programming, particularly for large-scale data processing and legacy IBM mainframe environments.

Primary Use Cases

▸Large-scale batch processing
▸Business and financial systems
▸Mainframe application maintenance
▸Data processing for enterprises
▸Legacy system integration and updates

Notable Features

▸Structured programming constructs
▸Strong support for record and array data types
▸Compiled for IBM mainframes
▸Integrated input/output for batch processing
▸Efficient memory and file handling

Origin & Creator

Developed by IBM in the 1960s, primarily as a high-level language for business and systems applications on mainframe computers.

Industrial Note

PLI remains in use in legacy IBM mainframe environments for maintaining mission-critical financial and administrative systems.