1 files changed, 94 insertions, 1 deletions
diff --git a/Year 1/Programming introduction/Homeworks/homework1.cpp b/Year 1/Programming introduction/Homeworks/homework1.cpp
index c6832ad..f76c172 100644
--- a/Year 1/Programming introduction/Homeworks/homework1.cpp
+++ b/Year 1/Programming introduction/Homeworks/homework1.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <cmath>
+#include <stdlib.h> // rand and srand for ex. 5
 
 using namespace std;
 
@@ -105,6 +106,98 @@ void ex4() {
 	cout << sumOfInterestingNumsBetween(a, b) << endl;
 }
 
+/* 
+ * Exercise 5
+ */
+
+const int NUMBER_LENGTH = 4, N = 10;
+
+int genSecretNum() {
+	// Initializes random seed (required for getting a random number on every program launch)
+	// Taken from included reference: https://www.cplusplus.com/reference/cstdlib/rand#example
+	srand (time(NULL));
+
+	int rnd = rand(), result = 0;
+
+	for (int i = 0; i < NUMBER_LENGTH;) {
+		if (rnd % 10 != 0) {
+			(result *= 10) += rnd % 10;
+			i++;
+		}
+		else if (rnd == 0) {
+			rnd = rand();
+		}
+
+		rnd /= 10;
+	}
+
+	return result;
+}
+
+bool digitInsideNum(int digit, int num) {
+	while (num != 0) {
+		if (digit == num % 10)
+			return true;
+		num /= 10;
+	}
+	return false;
+}
+
+void countBullsAndCows(int secretNum, int guess, int *bulls, int *cows) {
+	*bulls = *cows = 0;
+	
+	 // If our secret num can contain zeroes, this (and the corresponding checks) should be changed to some other digit
+	int secretCows = 0, guessCows = 0; 
+
+	/* Find bulls and separate the numbers that dont make a bull */
+
+	for (int i = 0; i < NUMBER_LENGTH; i++) {
+		if (guess % 10 == secretNum % 10)
+			*bulls += 1;
+		else {
+			(secretCows *= 10) += secretNum % 10;
+
+			// Getting unique cows prevents the later cow loop from incrementing cows
+			// multiple times when we have duplicate digits in secretNum and in guessCows
+			if (!digitInsideNum(guess % 10, guessCows))
+				(guessCows *= 10) += guess % 10;
+		}
+
+		secretNum /= 10;
+		guess /= 10;
+	}
+
+	while (secretCows != 0) {
+		if (digitInsideNum(secretCows % 10, guessCows))
+			*cows += 1;
+
+		secretCows /= 10;
+	}
+}
+
+void playBullsAndCows() {
+	int secNum = genSecretNum(), guess = 0, bulls = 0, cows = 0;
+	cout << secNum << endl;
+
+	for (int i = 0; i < N; i++)  {
+		cin >> guess;
+
+		if (guess == secNum) {
+			cout << "Позна!" << endl;
+			return;
+		}
+		else {
+			countBullsAndCows(secNum, guess, &bulls, &cows);
+			cout << bulls << " бикове и " << cows << " крави" << endl;
+		}
+	}
+	cout << "Не позна в определения брой ходове!" << endl;
+}
+
+void ex5() {
+	playBullsAndCows();
+}
+
 int main() {
-	ex4();
+	ex5();
 }