00001 #include "MusimatTutorial.h" 00002 MusimatTutorialSection(B0105) { 00003 Print("*** B.1.5 Variables ***"); 00004 /***************************************************************************** 00005 00006 B.1.5 Variables 00007 00008 We've seen variables already, but here's a proper introduction to them. 00009 00010 Variables are named places to store data. Names are indicated by one or more upper- or lower-case 00011 letters, like Q, n, or fred. Alphabetic case is significant, so fred denotes a different variable than 00012 does Fred. Numbers can also be used in variable names (for example, Fred33), but the first letter 00013 of a variable name may not be a number. 00014 00015 Since they physically embody data, variables occupy space and time. Variables flow into 00016 existence when they are defined, and generally hold their value until the end of the program 00017 unless additional steps are taken to change their value or to restrict their existence to a certain 00018 region of the program. 00019 00020 Here are some examples of Integer and Real variables. The examples also show the initialization 00021 of the variables with initial constant values using the assignment operator '='. 00022 00023 *****************************************************************************/ 00024 00025 Integer a = 3; // Define variable a and assign it an initial value of 3 00026 Real b = 3.14; // Define variable b and assign it an initial value of 3.14 00027 Print("a=", a); 00028 Print("b=", b); 00029 00030 // "Camel case" can make long variable names (slightly) easier to read 00031 Integer hereIsAFunnyVariableNameUsingCamelCase = 666; 00032 Print( hereIsAFunnyVariableNameUsingCamelCase ); 00033 00034 } 00035 00037 /* $Revision: 1.2 $ $Date: 2006/09/05 06:32:24 $ $Author: dgl $ $Name: $ $Id: B0105.cpp,v 1.2 2006/09/05 06:32:24 dgl Exp $ */ 00038 // The Musimat Tutorial � 2006 Gareth Loy 00039 // Derived from Chapter 9 and Appendix B of "Musimathics Vol. 1" � 2006 Gareth Loy 00040 // and published exclusively by The MIT Press. 00041 // This program is released WITHOUT ANY WARRANTY; without even the implied 00042 // warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 00043 // For information on usage and redistribution, and for a DISCLAIMER OF ALL 00044 // WARRANTIES, see the file, "LICENSE.txt," in this distribution. 00045 // "Musimathics" is available here: http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=10916 00046 // Gareth Loy's Musimathics website: http://www.musimathics.com/ 00047 // The Musimat website: http://www.musimat.com/ 00048 // This program is released under the terms of the GNU General Public License 00049 // available here: http://www.gnu.org/licenses/gpl.txt 00050
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