Monty Hall problem: Difference between revisions

Random gen = Random(unpredictableSeed);

uint switchWins = 0, stayWins = 0;

while(switchWins + stayWins < 100_000) {

uint carPos = dice(gen, 1, 1, 1); // Which door is car behind?

uint pickPos = dice(gen, 1, 1, 1); // Contestant's initial pick.

uint openPos; // Which door is opened by Monty Hall?

// Monty can't open the door you picked or the one with the car

// behind it.

do {

openPos = dice(gen, 1, 1, 1);

} while(openPos == pickPos || openPos == carPos);

uint switchPos = 0;

// Find position that's not currently picked by contestant and was

// not opened by Monty already.

for(; pickPos == switchPos || openPos == switchPos; switchPos++) {}

if(pickPos == carPos) {

stayWins++;

} else if(switchPos == carPos) {

switchWins++;

} else {

assert(0); // Can't happen.

}

}

writefln("Switching wins: %d Staying wins: %d", switchWins, stayWins);

<pre>

Switching wins: 66673 Staying wins: 33327

</pre>