feat(Week04): Add solutions

1 files changed, 81 insertions, 0 deletions

diff --git a/Week04/Exercise03/String.cpp b/Week04/Exercise03/String.cpp
new file mode 100644
index 0000000..4fe49f4
--- /dev/null
+++ b/Week04/Exercise03/String.cpp
@@ -0,0 +1,81 @@
+#include "String.h"
+#include "string.h"
+
+void String::free() {
+	delete[] str;
+}
+void String::copyFrom(const String& other) {
+	length = other.length;
+
+	// Не забравяме за терминиращата нула!
+	str = new char[length + 1];
+	for (unsigned i = 0; i <= length; ++i)
+		str[i] = other.str[i];
+}
+
+String::String() {
+	length = 0;
+	str = new char[1];
+	str[0] = '\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(const char* str) {
+	length = strlen(str);
+
+	this->str = new char[length + 1];
+	for (unsigned i = 0; i <= length; ++i)
+		this->str[i] = str[i];
+}
+
+unsigned String::GetLength() {
+	return length;
+}
+
+const char* String::GetStr() {
+	return str;
+}
+
+String String::Substring(unsigned startIndex, unsigned endIndex) {
+	if (endIndex >= length)
+		endIndex = length - 1;
+
+	String ret;
+	// Не забравяме за терминиращата нула!
+	ret.length = endIndex - startIndex + 2;
+
+	ret.str = new char[ret.length];
+	for (unsigned i = 0; i <= ret.length; ++i)
+		ret.str[i] = this->str[i + startIndex];
+
+	return ret;
+}
+
+String String::Concat(const String& rightHalf) {
+	String ret;
+	// Не забравяме за терминиращата нула!
+	ret.length = length + rightHalf.length + 1;
+
+	ret.str = new char[ret.length];
+	for (unsigned i = 0; i < length; ++i)
+		ret.str[i] = this->str[i];
+	for (unsigned i = 0; i <= rightHalf.length; ++i)
+		ret.str[i + length] = this->str[i];
+
+	return ret;
+}