?? state.cpp
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//: C03:State.cpp
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// A state-transition class
#include <iostream>
using namespace std;
// See "enum" defined later in this chapter for a better
// way to do this:
const int idle = 0;
const int pre_wash = 1;
const int spin1 = 2;
const int wash = 3;
const int spin2 = 4;
const int rinse = 5;
const int spin3 = 6;
class WashingMachine {
int current_cycle;
public:
void start() { current_cycle = idle; }
void next();
};
void WashingMachine::next() {
switch(current_cycle) {
case idle : current_cycle = pre_wash; break;
case pre_wash : current_cycle = spin1; break;
case spin1 : current_cycle = wash; break;
case wash: current_cycle = spin2; break;
case spin2 : current_cycle = rinse; break;
case rinse: current_cycle = spin3; break;
case spin3 : current_cycle = idle; break;
default : current_cycle = idle;
}
cout << "current_cycle = " << current_cycle << endl;
}
int main() {
WashingMachine WM;
WM.start();
for (int i = 0; i < 7; i++)
WM.next();
} ///:~
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