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QUOTER.CPP
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1995-02-23
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// File from page 296 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT01.ZIP 2/21/95
// Copyright (c) Bruce Eckel, 1995
// Source code file from the book "Thinking in C++",
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following
// statements: You may freely use this file for your own
// work, including modifications and distribution in
// executable form only. You may copy and distribute this
// file, as long as it is only distributed in the complete
// (compressed) package with the other files from this
// book and you do not remove this copyright and notice.
// You may not distribute modified versions of the source
// code in this package. This package may be freely placed
// on bulletin boards, internet nodes, shareware disks and
// product vendor disks. You may not use this file in
// printed media without the express permission of the
// author. Bruce Eckel makes no
// representation about the suitability of this software
// for any purpose. It is provided "as is" without express
// or implied warranty of any kind. The entire risk as to
// the quality and performance of the software is with
// you. Should the software prove defective, you assume
// the cost of all necessary servicing, repair, or
// correction.
// If you think you've found an error, please
// email all modified files with loudly commented changes
// to: eckel@aol.com (please use the same
// address for non-code errors found in the book).
//////////////////////////////////////////////////
//: QUOTER.CPP -- Random quote selection
#include <iostream.h>
#include <stdlib.h> // Random number generator
#include <time.h> // To seed random generator
class quoter {
int lastquote;
public:
quoter();
int Lastquote() const;
const char* quote();
};
quoter::quoter(){
lastquote = -1;
time_t t;
srand((unsigned) time(&t)); // Seed generator
}
int quoter::Lastquote() const {
return lastquote;
}
const char* quoter::quote() {
static const char* quotes[] = {
"Are we having fun yet?",
"Doctors always know best",
"Is it ... Atomic?",
"Fear is obscene",
"There is no scientific evidence "
"to support the idea "
"that life is serious",
};
const qsize = sizeof quotes/sizeof *quotes;
int qnum = rand() % qsize;
while(lastquote >= 0 && qnum == lastquote)
qnum = rand() % qsize;
return quotes[lastquote = qnum];
}
main() {
quoter q;
const quoter cq;
cq.Lastquote(); // OK
//! cq.quote(); // Not OK; non const function
for(int i = 0; i < 20; i++)
cout << q.quote() << endl;
}