Chapter 4 Further Reading

Official Documentation

Free Pascal Reference Guide: Input/Output — The authoritative reference for Read, ReadLn, Write, WriteLn, and formatting specifiers in Free Pascal. Available at https://www.freepascal.org/docs-html/ref/refch13.html.
Free Pascal RTL Reference: System Unit — Documents the Val, Str, Write, WriteLn, Read, and ReadLn procedures in the default System unit. See https://www.freepascal.org/docs-html/rtl/system/.
Free Pascal RTL Reference: CRT Unit — Full documentation for the CRT unit including ClrScr, GotoXY, TextColor, TextBackground, KeyPressed, and ReadKey. See https://www.freepascal.org/docs-html/rtl/crt/.

Jensen, K. and Wirth, N. Pascal User Manual and Report (4th edition, Springer, 1991). Wirth's own specification of standard Pascal, including the original definition of Read, Write, and their line-oriented counterparts. The formatting rules in Section 12 are the foundation for everything in this chapter.
Cantu, Marco. Object Pascal Handbook (latest edition). Chapter 2 covers basic I/O in Delphi's Object Pascal dialect. Useful for seeing how the same concepts apply in a modern commercial Pascal environment.
Duntemann, Jeff. Assembly Language Step-by-Step (3rd edition, Wiley, 2009). While not a Pascal book, Duntemann's explanation of how standard output actually reaches the screen — system calls, file descriptors, terminal drivers — provides valuable context for understanding what WriteLn is really doing at the machine level.

Wirth, N. "The Programming Language Pascal" (Acta Informatica, 1971). The original paper introducing Pascal. Section 11 defines the I/O procedures. Remarkably, the Write/WriteLn syntax and formatting rules have remained almost unchanged for over fifty years — a testament to Wirth's design.
Borland. Turbo Pascal 7.0 Language Guide (1992). Documents the CRT unit and Val procedure as Borland defined them. Free Pascal's implementations are direct descendants of these specifications.

Free Pascal Wiki: Console Programming — Practical guide to building console applications with Free Pascal, including tips on cross-platform terminal handling. See https://wiki.freepascal.org/.
Lazarus Forum: Console I/O FAQ — Community-maintained FAQ addressing common questions about Read/ReadLn behavior, input buffer issues, and character encoding in Free Pascal console programs. See https://forum.lazarus-ide.org/.

Kernighan, Brian. "Why Pascal Is Not My Favorite Programming Language" (1981). A famous critique by one of C's creators. Section 5 specifically criticizes Pascal's I/O system as too rigid compared to C's printf/scanf. Reading this alongside our chapter provides useful perspective: Kernighan's complaints were valid for 1981 Standard Pascal but have been largely addressed by Free Pascal's extensions (the Format function, SysUtils string utilities, and flexible Val procedure).
Dijkstra, Edsger. "On the Foolishness of Natural Language Programming" (EWD 667, 1978). Dijkstra argues that programming languages should be precise, not conversational. Pascal's I/O design reflects this philosophy: you must specify exactly what you want to read and how you want it displayed. There is no guessing, no automatic formatting, no implicit conversion — everything is explicit.

Chapter 5 builds on the input techniques from this chapter to create programs that make decisions based on user input.
Chapter 6 introduces loops, which will eliminate the repetitive code in our PennyWise checkpoint and allow us to read any number of expenses.
Chapter 13 extends I/O from the console to files, where the Read/ReadLn distinction and the {$I-}/IOResult mechanism become essential tools.