From 930bb7663e4e70a4c8aa186cb03aa90a006c19e8 Mon Sep 17 00:00:00 2001
From: Angel Dimitriev <achi_d@abv.bg>
Date: Wed, 17 Nov 2021 18:59:03 +0200
Subject: Create numerialSystemsExample.cpp

---
 Sem. 07/numerialSystemsExample.cpp | 98 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 Sem. 07/numerialSystemsExample.cpp

(limited to 'Sem. 07/numerialSystemsExample.cpp')

diff --git a/Sem. 07/numerialSystemsExample.cpp b/Sem. 07/numerialSystemsExample.cpp
new file mode 100644
index 0000000..620804c
--- /dev/null
+++ b/Sem. 07/numerialSystemsExample.cpp	
@@ -0,0 +1,98 @@
+#include <iostream>
+using namespace std;
+
+const unsigned MAX_SIZE = 32;
+
+char getCharByNumber(unsigned number)
+{
+	if (number <= 9)
+		return '0' + number;
+	if (10 <= number && number <= 35)
+		return 'A' + (number - 10);
+	else
+		return 'a' + (number - 36);
+}
+
+unsigned getNumberByChar(char ch)
+{
+	if ('0' <= ch && ch <= '9')
+		return ch - '0';
+	if ('A' <= ch && ch <= 'Z')
+		return 10 + ch - 'A';
+	if ('a' <= ch && ch <= 'z')
+		return 32 + ch - 'a';
+}
+
+void swap(int& a, int& b)
+{
+	int temp = a;
+	a = b;
+	b = temp;
+}
+void convertFromDecimal(unsigned number, char result[], unsigned k)
+{
+	unsigned resultInd = 0;
+	while (number != 0)
+	{
+		int symbolIndex = number % k;
+		result[resultInd++] = getCharByNumber(symbolIndex);
+		number /= k;
+	}
+
+	for (unsigned i = 0; i < resultInd / 2; i++)
+		swap(result[i], result[resultInd - 1 - i]);
+
+}
+
+unsigned convertToDecimal(const char number[], unsigned size, unsigned k)
+{
+	unsigned mult = 1;
+
+	unsigned result = 0;
+	for (int i = size - 1; i >= 0; i--)
+	{
+		result += getNumberByChar(number[i]) * mult;
+		mult *= k;
+	}
+
+	return result;
+}
+
+//fill with spaces from start
+void init(char buff[], unsigned start)
+{
+	for (unsigned i = start; i < MAX_SIZE; i++)
+		buff[i] = ' ';
+}
+
+void print(const char buff[])
+{
+	for (unsigned i = 0; i < MAX_SIZE; i++)
+		cout << buff[i];
+	cout << endl;
+}
+
+int main()
+{
+	{
+		unsigned n = 12345;
+		char buff[MAX_SIZE];
+		init(buff, 0);
+
+		convertFromDecimal(123456, buff, 16);
+
+		cout << n << " to hex: ";
+		print(buff);
+	}
+
+	{
+		unsigned n = 12345;
+		char buff[MAX_SIZE] = { 'A', '1', '2', 'B' };
+		init(buff, 5);
+
+		unsigned result = convertToDecimal(buff, 4, 16);
+
+		cout << buff << " to decimal: " << result << endl;
+	}
+}
+
-- 
cgit v1.3.1-23-gd82d