CSCE 121 Introduction to Program Design and Concepts | MyString.cpp

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#include "MyString.h" #include <iostream> using std::ostream; using std::cout, std::endl; MyString::MyString(const MyString& string1) : size1(0), capacity1(1), str(nullptr) { this->size1 = string1.size(); this->capacity1 = string1.capacity(); this->str = new char[this->capacity1]; for (size_t i = 0; i < this->size1; i++) { this->str[i] = string1.str[i]; } this->str[size1] = '\0'; } MyString::MyString() : size1(0), capacity1(1), str(nullptr) { this->size1 = 0; this->capacity1 = 1; this->str = new char[1]; this->str[0] = '\0'; } MyString::MyString(const char* val) : size1(0), capacity1(1), str(nullptr) { this->size1 = 0; this->capacity1 = 1; this->str = nullptr; if (val == nullptr) { this->size1 = 0; this->capacity1 = 1; this->str = new char[this->capacity1]; this->str[0] = '\0'; } else { int i = 0; size_t newsize = 0; while (val[i] != '\0') { newsize += 1; i += 1; } this->size1 = newsize; this->capacity1 = newsize + 1; this->str = new char[this->capacity1]; for (size_t j = 0; j < this->size1; j++) { this->str[j] = val[j]; } this->str[this->size1] = '\0'; }

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} MyString::~MyString() { delete[] str; } void MyString::resize(size_t n) { this->capacity1 = n; char* temp = new char[n]; int index = 0; while (this->str[index] != '\0') { temp[index] = str[index]; index+=1; } temp[index] = '\0'; delete[] this->str; this->str = temp; this->capacity1 = n; } const char& MyString::at (size_t pos) const { if(pos < this->length()) { return this->str[pos]; } else { throw std::out_of_range("Invalid position"); } } size_t MyString::capacity() const { return this->capacity1; } size_t MyString::length() const { return this->size1; } size_t MyString::size() const { return this->size1; } bool MyString::empty() const { if (this->str[0] == '\0') { return true; } else { return false; } } void MyString::clear() {

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delete[] this->str; this->str = new char[this->capacity1]; this->str[this->length()] = '\0'; this->size1 = 0; } const char& MyString::front() const { if (this->str[0] == '\0') { throw std::invalid_argument(""); } else { return this->str[0]; } } ostream& operator<< (ostream& os, const MyString& str) { for(size_t i = 0; i < str.size(); i++) { os << str.at(i); } return os; } MyString& MyString::operator+= (const MyString& str) { if (!str.empty()) { size_t ogSize = this->size1; this->size1 += str.size1; this->capacity1 += str.capacity1; char* newChar = new char[this->capacity1]; for (size_t i = 0; i < ogSize; i++) { newChar[i] = this->str[i]; } for (size_t k = 0; k < str.size1; k++) { newChar[ogSize + k] = str.str[k]; } newChar[this->size1] = '\0'; delete[] this->str; this->str = newChar; } return *this; } MyString& MyString::operator= (const MyString& string1) { delete[] this->str; this->capacity1 = string1.capacity1; this->size1 = string1.size1; this->str = new char[string1.capacity1]; for (unsigned int i = 0; i < string1.size1; i++) { this->str[i] = string1.str[i]; } return *this; } bool MyString::operator== (const MyString& string1) {

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if (this->size1 != string1.size1) { return false; } else { for (unsigned int i = 0 ; i < size1; i++) { if (string1.str[i] != this->str[i]) { return false; } }

}

} return true;

size_t MyString::find(const MyString& string1, size_t pos) { if (string1.str == nullptr) { return -1; } if (pos + string1.size() > this->size1 - 1) { return -1; } bool check = true; for (size_t i = pos; i < this->size1; i++) { if (this->at(i) == string1.at(0)) { for (size_t j = 1; j < string1.size1; j++) { if (i + j > this->size1 - 1) { check = false; break; } else { if (this->at(i + j) != string1.at(j)) { check = false; } } } if (check) { return i; } } } return -1; } char* MyString::data() const { return str; }

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