00001 #include "MusimatTutorial.h" 00002 MusimatTutorialSection(B0109) { 00003 Print("*** B.1.9 Assignment ***"); 00004 /***************************************************************************** 00005 00006 B.1.9 Assignment 00007 00008 We have already seen assignment, but here's a proper introduction. 00009 00010 We can assign the value of an expression to a variable using the assignment operator =. For example, 00011 00012 lhs = rhs; 00013 00014 assigns the expression rhs to lhs. The object on the right-hand side of the = sign (i.e., rhs) can 00015 be any expression. The object on the left-hand side (i.e., lhs) must be a variable name, with one 00016 exception. For example, the statement 00017 *****************************************************************************/ 00018 00019 Integer s = 3 + 5; 00020 Print(s); 00021 00022 /***************************************************************************** 00023 sets the value of Integer variable s to 8. 00024 00025 The left-hand side of an assignment can also indicate that a certain element of a list is to receive 00026 the value on the right-hand side. For example, here's an IntegerList: 00027 *****************************************************************************/ 00028 00029 IntegerList iL(10, 11, 12, 13); 00030 Print("Initial form of iL = ", iL); 00031 00032 /***************************************************************************** 00033 The next statement replaces the second element on the list (counting from 0) with 100: 00034 *****************************************************************************/ 00035 00036 iL[2] = 100; 00037 00038 /***************************************************************************** 00039 This causes the list to become 00040 00041 (10, 11, 100, 13) 00042 00043 Note that lists are indexed starting at 0. 00044 *****************************************************************************/ 00045 00046 Print( "After replacement of 2nd element, iL=", iL ); 00047 00048 } 00049 00051 /* $Revision: 1.2 $ $Date: 2006/09/05 06:32:25 $ $Author: dgl $ $Name: $ $Id: B0109.cpp,v 1.2 2006/09/05 06:32:25 dgl Exp $ */ 00052 // The Musimat Tutorial � 2006 Gareth Loy 00053 // Derived from Chapter 9 and Appendix B of "Musimathics Vol. 1" � 2006 Gareth Loy 00054 // and published exclusively by The MIT Press. 00055 // This program is released WITHOUT ANY WARRANTY; without even the implied 00056 // warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 00057 // For information on usage and redistribution, and for a DISCLAIMER OF ALL 00058 // WARRANTIES, see the file, "LICENSE.txt," in this distribution. 00059 // "Musimathics" is available here: http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=10916 00060 // Gareth Loy's Musimathics website: http://www.musimathics.com/ 00061 // The Musimat website: http://www.musimat.com/ 00062 // This program is released under the terms of the GNU General Public License 00063 // available here: http://www.gnu.org/licenses/gpl.txt 00064
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