In this game, the user and the computer choose each one an option between stone,scissors and paper. Stone wins over scissors, scissors over paper and paper over stone:
stone -> scissors -> paper -> stone...
The first who wins WINSCORE times is
the competition winner.
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// *****************************************
// Title: "Stone, Scissors or Paper"
//
// Description:
// In this game, the user and the computer
// choose each one an option between stone,
// scissors and paper.
// Stone wins over scissors, scissors over
// paper and paper over stone:
// stone -> scissors -> paper -> stone...
// The first who wins WINSCORE times is
// the competition winner.
// *****************************************
#include
#include
#include
#define WINSCORE 3
// Function PickRandomOption
// * Returns a random character between 's', 'x', and 'p'
char PickRandomOption (void)
{
char option;
srand ( time (NULL) ); // (re)initialize random number generator
int value = rand()%3; // Generate random number between 0 and 2
switch (value) {
case 0: option='s'; break;
case 1: option='x'; break;
case 2: option='p'; break;
}
return option;
}
// Function WhoWins
// * check which of the characters passed wins.
// return values:
// 0= tie, 1=the first, 2=the second, -1=error
int WhoWins (char a, char b)
{
switch (a)
{
case 's':
if (b=='x') return 1;
else if (b=='p') return 2;
else return 0;
case 'x':
if (b=='p') return 1;
else if (b=='s') return 2;
else return 0;
case 'p':
if (b=='s') return 1;
else if (b=='x') return 2;
else return 0;
default:
return -1;
}
// NOTE: no break instructions were included in this switch statement
// because a break instruction at the end of a case would never
// been executed because there would always be a return statement
// executed before.
// For the same reason this peculiar function has no explicit ending
// return statement.
}
main ()
{
char you, me;
int mypoints=0;
int yourpoints=0;
int winner;
do {
//prompt user.
cout << "nEnter s, x or p ";
cout << "(s=stone, x=scissors, p=paper): ";
cin >> you;
//decide computer's option and say it
me = PickRandomOption();
cout << "I say: " << me << "n";
// check who is the winner
winner = WhoWins (you,me);
// show appropiate message:
if (winner==0) cout << "Tiedn";
else if (winner==1) { cout << "You winn"; yourpoints++; }
else if (winner==2) { cout << "I winn"; mypoints++; }
else cout << "Sorry. You entered an Invalid optionn";
// show current scoreboard.
cout << "POINTS: You:" << yourpoints;
cout << " Me:" << mypoints << "n";
} while (yourpointsmypoints) cout << "You win the competition!n";
else cout << "I win the competition!n";
return 0;
}
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