2.13 Chapter Summary

2.13 Chapter Summary

This chapter covered these topics:

what a Modula-2 program is
what the basic structure of a Modula-2 program is
what a module is
how to give correct names (identifiers) to Modula-2 entities
how to write comments
how to distinguish among literals, variables and constants
how to assign values to variables and equate values to constants
about the types INTEGER, CARDINAL, CHAR, and REAL
about expressions, precedence and some type conversions
how to talk to a program and make it talk to a user

It included discussion of the following Modula-2 built-ins:

Reserved Words	Standard Identifiers
BEGIN ... END	CARDINAL
CONST	CHAR
DIV	FLOAT
DO	INT
FROM ... IMPORT	INTEGER
MOD	LONGREAL
MODULE	LFLOAT
REM	REAL
WHILE	TRUNC
VAR	VAL
	CARD*
	LONGCARD*
	LONGINT*

* indicates a non-standard word that may be present in some versions.

Symbols	Imports
	From STextIO (InOut):	ReadChar (Read)
+		WriteChar (Write)
-		WriteLn
*		WriteString
=		SkipLine
/	From SWholeIO (InOut):	ReadCard
E		WriteCard
:=		ReadInt
		WriteInt
	From SRealIO:	ReadReal
	(RealInOut)	WriteReal
		WriteFloat (ISO only)
		WriteFixed (ISO only)

indicates the usual name in non ISO compliant versions using InOut.