feat(Week05): Add solutions

1 files changed, 103 insertions, 0 deletions

diff --git a/Week05/Exercise02/String.cpp b/Week05/Exercise02/String.cpp
new file mode 100644
index 0000000..e2b082d
--- /dev/null
+++ b/Week05/Exercise02/String.cpp
@@ -0,0 +1,103 @@
+#include "String.h"
+#include <cstring>
+
+void String::free() {
+	delete[] str;
+}
+
+void String::copyFrom(const String& other) {
+	length = other.length;
+
+	// Не забравяме за терминиращата нула
+	str = new char[length + 1];
+	strncpy(str, other.str, length + 1);
+}
+
+String::String() {
+	str = nullptr;
+	length = 0;
+}
+
+String::~String() {
+	free();
+}
+
+String::String(const String& other) {
+	copyFrom(other);
+}
+
+String& String::operator=(const String& other) {
+	if (this != &other) {
+		free();
+		copyFrom(other);
+	}
+	return *this;
+}
+
+String::String(String&& other) {
+	str = other.str;
+	length = other.length;
+
+	other.str = nullptr;
+	other.length = 0;
+}
+
+String& String::operator=(String&& other) {
+	if (this != &other) {
+		free();
+
+		str = other.str;
+		length = other.length;
+
+		other.str = nullptr;
+		other.length = 0;
+	}
+	return *this;
+}
+
+String::String(const char* str) {
+	length = strlen(str);
+	this->str = new char[length + 1];
+	strncpy(this->str, str, length + 1);
+}
+
+String String::Substring(unsigned startIndex, unsigned length) const {
+	String result;
+	if (startIndex >= this->length) {
+		return result;
+	}
+
+	if (startIndex + length >= this->length) {
+		length = this->length - startIndex;
+	}
+
+	result.length = length;
+	result.str = new char[length + 1];
+	strncpy(result.str, str, length);
+	result.str[length + 1] = '\0';
+
+	return result;
+}
+
+void String::Concat(const String& end) {
+	char* newStr = new char[length + end.length + 1];
+	strncpy(newStr, str, length);
+	strncpy(newStr + length, end.str, end.length + 1);
+
+	delete[] str;
+	str = newStr;
+	length += end.length;
+}
+
+unsigned String::CountWords() const {
+	unsigned words = 0;
+	bool prevBlank = true;
+
+	for (const char* s = str; *s != '\0'; ++s) {
+		if (prevBlank && *s != ' ')
+			++words;
+		prevBlank = *s == ' ';
+	}
+
+	return words;
+}