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#include <iostream>
using namespace std;
// A function to pick a random number
int rollDie( int sides )
{
return 1 + rand() % sides;
}
// A function that utilizes the roll die function to put together a 4 digit number (numbers are 1-8)
int generateAnswer()
{
int value, answer;
cin >> value;
if (value == 0)
answer = 1000*rollDie(8) + 100*rollDie(8) + 10*rollDie(8) + rollDie(8);
else
answer = value;
return answer;
}
int nthDigit( int combination, int position )
{
int current; // current digit in the 1's place
while (position < 4)
{
combination /= 10; // knock off a digit
position++; // desired digit moved to the right
}
// Now that the desired digit is in the one's place,
// remove the leading digits.
return (combination % 10); // remainder modulo 10 is one's place
}
void clearNthDigit( int &combination, int position )
{
int current;
int digitValue;
current = 4;
digitValue = 1;
while (position < current)
{
digitValue *= 10;
current--;
}
combination -= digitValue * nthDigit( combination, position );
}
void evaluate( int guess, int answer, int &black, int &white )
{
black = 0;
white = 0;
for (int i=1; i<=4; i++)
if (nthDigit( guess, i ) == nthDigit( answer, i ) )
{
black++;
clearNthDigit( guess, i );
clearNthDigit( answer, i );
}
for (int i=1; i<=4; i++)
for (int j=1; j<=4 && nthDigit(guess,i)>0; j++)
if (nthDigit( guess,i ) == nthDigit( answer, j ) )
{
white++;
clearNthDigit( guess, i );
clearNthDigit( answer, j );
}
}
int* generateSearchSpace(int guesses[], int length)
{
int count = 0;
for (int a = 1; a <=8; ++a)
for (int b = 1; b <=8; ++b)
for (int c = 1; c <=8; ++c)
for (int d = 1; d<=8; ++d)
{
guesses[count] = 1000*a + 100*b + 10*c + d;
count++;
}
return guesses;
}
void trim(int guesses[], int length, int guess, int black, int white)
{
int wrongNumber[8];
int possibleNumber[4];
if (black == 0 && white == 0) //If no numbers are found to be correct or in the wrong position
{
for(int x = guess; x < length; x++)
guesses[x] = NULL;
}
if (black + white == 4)
{
for (int x=0; x<4; x++)
possibleNumber[x] = nthDigit(x, guess);
}
for (int x=0; x<length; x++)
for(int y=0; y<4; y++)
for(int z=0; z != NULL; z++)
if(nthDigit (y, guesses[x]) == wrongNumber[z])
guesses[x]=0;
}
int methodicalEliminate(int answer)
{
const int Length = 4096;
int list[Length];
int guess;
int x = 0;
int tries = 0;
while (x<Length && (list[x] == NULL || list[x] == 0))
x++;
guess = list[x];
generateSearchSpace (list, Length);
trim (list,Length,guess,black,white);
return tries;
}
void guessAndEliminate(int answer)
{
const int Length = 4096;
int list[Length];
int guess;
int x = 0;
//int tries
while (x<Length && (list[x] == NULL || list[x] == 0))
x++;
guess = list[x];
generateSearchSpace (list, Length);
//trim (list,Length,guess,black,white);
// return tries;
}
void guessThreeAndEliminate(int answer)
{
const int Length = 4096;
int list[Length];
int guess;
int x = 0;
//int tries
while (x<Length && (list[x] == NULL || list[x] == 0))
x++;
guess = list[x];
generateSearchSpace (list, Length);
//trim (list,Length,guess,black,white);
// return tries;
}
int main()
{
char yesOrNo = 'y';
while (yesOrNo == 'y')
{
cout << "Please enter a 4 digit combination, or press 0 for a random value: ";
cout << "Guessing at " << generateAnswer() << endl; // Displays random or user-selected 4 digit number
// int answer = generateAnswer();
//methodicalEliminate(answer);
//guessThreeThenEliminate(answer);
//GuessAndEliminate(answer);
cout << "Would you like to play another game? (y/n) ";
cin >> yesOrNo;
}
cout << "Thank you for playing!" << endl;
return 0;
}
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