added sem 12

4 files changed, 221 insertions, 0 deletions

diff --git a/Sem. 12/README.md b/Sem. 12/README.md
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+**Задача 1:** Напишете функция, която приема стринг и връща нов стринг, в който са премахнати всички цифри от първия стринг. 
+Новият стринг да е с точна дължина.
+
+Пример:
+Вход: "ivan454sdd"
+
+Изход: "ivanssd"
+
+**Задача 2:** Да се реализира функция, която приема масив, в който всеки елемент се среща 2 пъти, с изключение на един елемент, който се среща точно веднъж.
+Функцията да връща кой е този елемент.
+
+
+**Задача 3:** Напишете функция, която примема стринг A, стринг X и приема и стринг Y и замества всяко срещане на X в А с Y.
+Новият стринг да е с точна дължина.
+
+Пример:
+A = hello friends! You are my best friend. I have no other friends!
+X = friend
+Y = enemy
+
+Резултат: hello enemys! You are my best enemy. I have no other enemys
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diff --git a/Sem. 12/task1.cpp b/Sem. 12/task1.cpp
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+++ b/Sem. 12/task1.cpp
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+#include <iostream>
+using namespace std;
+
+bool isDigit(char ch)
+{
+	return ch >= '0' && ch <= '9';
+}
+int countDigits(const char* str)
+{
+	//int len = strlen(str);
+	//int count = 0;
+	//for (int i = 0; i < len; i++)
+	//{
+	//	if (isDigit(str[i]))
+	//		count++;
+	//}
+
+	int count = 0;
+	while (*str != '\0')
+	{
+		if (isDigit(*str))
+			count++;
+		str++;
+	}
+	return count;
+}
+
+void removeDigits(const char* str, char* resultStr)
+{
+	while (*str != '\0')
+	{
+		if (!isDigit(*str))
+		{
+			*resultStr = *str;
+			resultStr++;
+		}
+		str++;
+	}
+	*resultStr = '\0';
+}
+int main()
+{
+	const char* str = "hello friends 123 , how are you? 343. Fine!";
+
+	int len = strlen(str) - countDigits(str);
+
+	char* resultStr = new char[len + 1];
+
+	removeDigits(str, resultStr);
+
+	cout << resultStr << endl;
+
+	delete[] resultStr;
+}
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diff --git a/Sem. 12/task3.cpp b/Sem. 12/task3.cpp
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index 0000000..ba0ba1b
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+++ b/Sem. 12/task3.cpp
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+#include <iostream>
+using namespace std;
+
+int search(const char* string, const char* searched);
+
+void replace(const char* string, const char* x, const char* y, char* result)
+{
+	int yLen = strlen(y);
+	int xLen = strlen(x);
+	while (true)
+	{
+		int indX = search(string, x);  //14
+		if (indX == -1)
+			break;
+	
+
+		for (int i = 0; i < indX; i++)
+			result[i] = string[i];
+		result += indX;
+		string += indX + xLen;
+
+		for (int i = 0; i < yLen; i++)
+			result[i] = y[i];
+		result += yLen;
+	}
+
+	//the rest symbols
+	while (*string != '\0')
+	{
+		*result = *string;
+		result++;
+		string++;
+	}
+	*result = '\0';
+
+}
+
+//return the first index of searched in str.
+int search(const char* str, const char* searched) 
+{
+	int len1 = strlen(str);
+	int len2 = strlen(searched);
+	for (int i = 0; i < len1 - len2+1; i++)
+	{
+		bool found = true;
+		for (int j = 0; j < len2; j++)
+		{
+			if (searched[j] != str[i + j])
+			{
+				found = false;
+				break;
+			}
+		}
+		if (found)
+			return i;
+	}
+	return -1;
+}
+int countOccurrences(const char* str, const char* searched)
+{
+	int count = 0;
+
+	int searchLen = strlen(searched);
+	int ind = search(str, searched);
+	while (ind != -1)
+	{
+		count++;
+		str += (ind + searchLen);
+		ind = search(str, searched);
+	}
+	return count;
+}
+int main()
+{
+	const char* str = "hello friends! You are my best friends. I have no other friends";
+	const char* x = "friend";
+	const char* y = "enemy";
+
+	int len = strlen(str);
+	int xOccurrences = countOccurrences(str, x);
+
+	char* result = new char[len - xOccurrences*strlen(x) + xOccurrences*strlen(y) + 1];
+
+	replace(str, x, y, result);
+
+	cout << result << endl;
+	
+	delete[] result;
+}
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diff --git a/Sem. 12/tesk2.cpp b/Sem. 12/tesk2.cpp
new file mode 100644
index 0000000..fc7df86
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+++ b/Sem. 12/tesk2.cpp
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+#include <iostream>
+using namespace std;
+
+
+bool isSymbol(char ch)
+{
+	return  ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z');
+}
+bool isVowel(char ch)
+{
+	switch (ch)
+	{
+	case 'A':
+	case 'O':
+	case 'I':
+	case 'U':
+	case 'E':
+	case 'a':
+	case 'o':
+	case 'i':
+	case 'u':
+	case 'e':return true;
+	}
+	return false;
+}
+void countVowelAndCons(const char* str, int& vowelCount, int& consCount) 
+{
+	while (*str != '\0')
+	{
+		if (isSymbol(*str))
+		{
+			if (isVowel(*str))
+				vowelCount++;
+			else
+				consCount++;
+		}
+		str++;
+	}
+}
+
+bool isBalanced(const char* str)
+{
+	int vowelCount = 0, consCount = 0;
+
+	countVowelAndCons(str, vowelCount, consCount);
+
+	return vowelCount == consCount;
+}
+
+int main()
+{
+	const char* str = "TestMeau";
+	
+	cout << isBalanced(str) << endl;
+
+
+}
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