87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
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// fig05_05.cpp
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// Craps simulation.
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#include <fmt/format.h>
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#include <iostream>
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#include <random>
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using namespace std;
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int rollDice(); // rolls dice, calculates and displays sum
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int main() {
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// scoped enumeration with constants that represent the game status
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enum class Status {keepRolling, won, lost};
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int myPoint{0}; // point if no win or loss on first roll
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Status gameStatus{Status::keepRolling}; // game is not over
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// determine game status and point (if needed) based on first roll
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switch (const int sumOfDice{rollDice()}) {
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case 7: // win with 7 on first roll
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case 11: // win with 11 on first roll
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gameStatus = Status::won;
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break;
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case 2: // lose with 2 on first roll
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case 3: // lose with 3 on first roll
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case 12: // lose with 12 on first roll
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gameStatus = Status::lost;
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break;
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default: // did not win or lose, so remember point
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myPoint = sumOfDice; // remember the point
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cout << fmt::format("Point is {}\n", myPoint);
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break; // optional (but recommended) at end of switch
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}
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// while game is not complete
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while (Status::keepRolling == gameStatus) { // not won or lost
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// roll dice again and determine game status
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if (const int sumOfDice{rollDice()}; sumOfDice == myPoint) {
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gameStatus = Status::won;
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}
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else if (sumOfDice == 7) { // lose by rolling 7 before point
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gameStatus = Status::lost;
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}
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}
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// display won or lost message
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if (Status::won == gameStatus) {
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cout << "Player wins\n";
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}
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else {
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cout << "Player loses\n";
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}
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}
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// roll dice, calculate sum and display results
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int rollDice() {
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// set up random-number generation
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static random_device rd; // used to seed the default_random_engine
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static default_random_engine engine{rd()}; // rd() produces a seed
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static uniform_int_distribution randomDie{1, 6};
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const int die1{randomDie(engine)}; // first die roll
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const int die2{randomDie(engine)}; // second die roll
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const int sum{die1 + die2}; // compute sum of die values
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// display results of this roll
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cout << fmt::format("Player rolled {} + {} = {}\n", die1, die2, sum);
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return sum;
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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