12 files changed, 165 insertions, 5 deletions
diff --git a/pract_SI/Pract. 04/Solutions/task4 - abs.cpp b/pract_SI/Pract. 04/Solutions/task4 - abs.cpp
new file mode 100644
index 0000000..771550b
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions/task4 - abs.cpp
@@ -0,0 +1,4 @@
+int abs(int num1, int num2)
+{
+    return ((num1 - num2) >= 0 ? (num1 - num2) : (num2 - num1));
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions/task4 - fabs.cpp b/pract_SI/Pract. 04/Solutions/task4 - fabs.cpp
new file mode 100644
index 0000000..bb2f15b
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions/task4 - fabs.cpp
@@ -0,0 +1,4 @@
+double fabs(double &num)
+{
+	return num > 0.0 ? num : -num;	
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions/task7 - a).cpp b/pract_SI/Pract. 04/Solutions/task7 - a).cpp
new file mode 100644
index 0000000..8a590b4
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions/task7 - a).cpp
@@ -0,0 +1,3 @@
+bool isInInterval(int num) {
+	return num >= 100 && num <= 10000;
+}
diff --git a/pract_SI/Pract. 04/Solutions/task7 - b).cpp b/pract_SI/Pract. 04/Solutions/task7 - b).cpp
new file mode 100644
index 0000000..4dde747
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions/task7 - b).cpp
@@ -0,0 +1,3 @@
+bool isNumberInInterval(long longnum, long long interval_lower_bound, long long interval_upper_bound,) {
+	return num >= interval_lower_bound && num <= interval_upper_bound;
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions/task8.cpp b/pract_SI/Pract. 04/Solutions/task8.cpp
new file mode 100644
index 0000000..9d91c6a
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions/task8.cpp
@@ -0,0 +1,9 @@
+long long pow(int num, unsigned N)
+{
+	long long result = 1;
+
+	for (size_t i = 0; i < N; i++)
+		result *= num;
+
+	return result;
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions/task9.cpp b/pract_SI/Pract. 04/Solutions/task9.cpp
new file mode 100644
index 0000000..0356de8
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions/task9.cpp
@@ -0,0 +1,17 @@
+int calculate(int a, int b, char action = '+')
+{
+	switch (action)
+	{
+	case '+': return a + b;
+	
+	case '-': return a - b;
+	
+	case '*': return a * b;
+	
+	case '/': return a / b;
+	
+	case '%': return a % b;
+	
+	default: return -1;
+	}
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions_10-14/task10.cpp b/pract_SI/Pract. 04/Solutions_10-14/task10.cpp
new file mode 100644
index 0000000..e9e83b9
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions_10-14/task10.cpp
@@ -0,0 +1,9 @@
+int askUser(int from, int to)
+{
+	int number;
+	while (std::cin >> number)
+	{
+		if (number >= from && number <= to)
+			return number;
+	}
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions_10-14/task11.cpp b/pract_SI/Pract. 04/Solutions_10-14/task11.cpp
new file mode 100644
index 0000000..77d76e5
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions_10-14/task11.cpp
@@ -0,0 +1,25 @@
+void convertIfNegative(int &number)
+{
+	if (number < 0)
+		number *= -1;
+}
+
+unsigned long long toBinary(int number)
+{
+	convertIfNegative(number);
+
+	unsigned long long toBinary = 0;
+	short digits = 0;
+	while (number > 0)
+	{
+		unsigned long long temp = 1;
+		for (size_t i = 0; i < digits; i++)
+			temp *= 10;
+
+		toBinary += (number % 2) * temp;
+		digits++;
+		number /= 2;
+	}
+
+	return toBinary;
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions_10-14/task11_recursive.cpp b/pract_SI/Pract. 04/Solutions_10-14/task11_recursive.cpp
new file mode 100644
index 0000000..1b9a3e3
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions_10-14/task11_recursive.cpp
@@ -0,0 +1,12 @@
+/*
+NOTE!
+Current Solution uses recursion, which we still have NOT taken/discussed.
+*/
+
+void toBinary(unsigned int num)
+{
+	if (num > 1) {
+		toBinary(num / 2);
+	}
+	std::cout << num % 2;
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions_10-14/task12.cpp b/pract_SI/Pract. 04/Solutions_10-14/task12.cpp
new file mode 100644
index 0000000..464b17b
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions_10-14/task12.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+using namespace std;
+
+int gcd(int x, int y)
+{
+	while (x != y)
+		if (x > y)
+			x -= y;
+		else
+			y -= x;
+	return x;
+}
+
+int main()
+{
+	int a, b, c, d;
+
+	cout << "a, b, c, d= ";
+	cin >> a >> b >> c >> d;
+	if (!cin || a < 1 || b < 1 || c < 1 || d < 1)
+	{
+		cout << "Error! \n";
+		return 1;
+	}
+
+	int r = gcd(a, b);
+	cout << "gcd{" << a << ", " << b << "}= " << r << "\n";
+
+	int s = gcd(c, d);
+	cout << "gcd{" << c << ", " << d << "}= " << s << "\n";
+
+	cout << "gcd{" << a << ", " << b << ", " << c << ", " << d << "}= " << gcd(r, s) << "\n";
+
+	return 0;
+}
diff --git a/pract_SI/Pract. 04/Solutions_10-14/task13.cpp b/pract_SI/Pract. 04/Solutions_10-14/task13.cpp
new file mode 100644
index 0000000..8acb1c9
--- /dev/null
+++ b/pract_SI/Pract. 04/Solutions_10-14/task13.cpp
@@ -0,0 +1,43 @@
+#include<iostream>
+using namespace std;
+
+int input()
+{
+	int number;
+	do
+	{
+		cout << "Enter a valid number: ";
+		cin >> number;
+	} while (!cin || number < 100 || number > 100000);
+	return number;
+}
+
+int dist(int number1, int number2)
+{
+	int diff = number1 - number2;
+	return diff >= 0 ? diff : -diff;
+}
+
+int closestLargerPowerOf2(int number)
+{
+	int power = 1;
+	while (power < number)
+	{
+		power <<= 1;
+	}
+	return power;
+}
+
+int main()
+{
+	int number = input();
+	int larger = closestLargerPowerOf2(number);
+	int smaller = larger >> 1;
+
+	int distToSmaller = dist(number, smaller);
+	int distToLarger = dist(number, larger);
+
+	cout << "Closest power of two to " << number << ": " << ((distToSmaller < distToLarger) ? smaller : larger) << endl;
+
+	return 0;
+}
+\ No newline at end of file
diff --git a/pract_SI/Pract. 04/Solutions_10-14/task14.cpp b/pract_SI/Pract. 04/Solutions_10-14/task14.cpp
index c95c36c..405bcf7 100644
--- a/pract_SI/Pract. 04/Solutions_10-14/task14.cpp
+++ b/pract_SI/Pract. 04/Solutions_10-14/task14.cpp
@@ -8,7 +8,6 @@ bool isPrime(int number)
 {
 	int size = sqrt(number);
 	                         
-
 	for (int i = 2; i <= size; i++)
 	{
 		if (number % i == 0)
@@ -88,9 +87,6 @@ int main()
 		std::cout << primeOfNumber << " + " << number - primeOfNumber << std::endl;
 	else
 		std::cout << "Error!" << std::endl;
-
-  
-
-
+	
 	return 0;
 }