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#include <iostream>
using namespace std;
const int DIGITS_COUNT = 4;
int getNumLen(int n)
{
int count = 0;
while (n != 0)
{
count++;
n /= 10;
}
return count;
}
bool containsDigit(int n, int digit)
{
while (n != 0)
{
int lastDigit = n % 10;
if (digit == lastDigit)
return true;
n /= 10;
}
return false;
}
bool containsDiffrentDigits(int n)
{
while (n >= 10)
{
int lastDigit = n % 10;
n /= 10;
if (containsDigit(n, lastDigit))
return false;
}
return true;
}
bool isValid(int n)
{
return getNumLen(n) == DIGITS_COUNT && containsDiffrentDigits(n);
}
void userInput(int& toGuess)
{
do
{
cin >> toGuess;
} while (!isValid(toGuess));
}
int getBulls(int toGuess, int myGuess)
{
int bulls = 0;
while (toGuess != 0)
{
int toGuessLastDigit = toGuess % 10;
int myGuessLastDigit = myGuess % 10;
if (toGuessLastDigit == myGuessLastDigit)
bulls++;
toGuess /= 10;
myGuess /= 10;
}
return bulls;
}
int getCows(int toGuess, int myGuess, int bulls)
{
int cows = 0;
while (myGuess != 0)
{
int lastDigit = myGuess % 10;
if (containsDigit(toGuess, lastDigit))
cows++;
myGuess /= 10;
}
return cows - bulls;
}
void getBullsAndCows(int toGuess, int myGuess, int& bulls, int& cows)
{
bulls = getBulls(toGuess, myGuess);
cows = getCows(toGuess, myGuess, bulls);
}
int main()
{
int toGuess;
userInput(toGuess);
cout << "Try to guess:" << endl;
int bulls = 0;
int cows = 0;
while (bulls != DIGITS_COUNT)
{
int myGuess;
userInput(myGuess);
getBullsAndCows(toGuess, myGuess, bulls, cows);
cout << "Bulls: " << bulls << " " << ", Cows: " << cows << endl;
}
cout << "Success!" << endl;
}
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