#define _CRT_SECURE_NO_WARNINGS #include #include #include using namespace std; class String { char* arr; int size; int len; public: String() { size = 0; len = 0; arr = nullptr; } String(const char* s) { len = strlen(s); size = strlen(s) + 1; arr = new char[size]; strcpy(arr, s); arr[len] = 0; } String(const String& s) { len = s.len; size = s.size; arr = new char[size]; //cout << "Salam"; strcpy(arr, s.arr); arr[len] = 0; } ~String() { delete[]arr; } String& assign(const char* s, int count = 0) { size = (strlen(s) + 1) * count; len = strlen(s) * count; delete [] arr; arr = new char[size]; for (int i = 0; i < count; i++) { strcat(arr, s); } arr[len] = 0; return *this; } String& assign(const String& s, int from, int count) { size = count + 1; len = count; delete[] arr; arr = new char[size]; strncpy(s.arr, s.arr + from, count); arr[len] = 0; return *this; } String& assign(int count, char c) { size = count + 1; len = count; delete[] arr; arr = new char[size]; for (int i = 0; i < count; i++) { strcat(arr, &c); } arr[len] = 0; return *this; } String& operator = (const String& s) { size = s.size; len = s.len; delete[] arr; arr = new char[size]; strcpy(arr, s.arr); //arr[len] = 0; return *this; } String& append(const String& s) { size += s.size-1; len += s.len; char* temp = new char[size]; for (int i = 0; i < len ; i++) { temp[i] = arr[i]; } delete[] arr; strcat(temp, s.arr); arr = temp; return *this; } String& operator +(const String& s) { size += s.size - 1; len += s.len; delete[] arr; arr = new char[size]; strcat(arr, s.arr); //arr[len] = 0; return *this; } String& operator +=(const String& s) { size += s.size - 1; len += s.len; char* temp = new char[size]; for (int i = 0; i < len; i++) { temp[i] = arr[i]; } delete[] arr; arr = new char[size]; strcat(temp, s.arr); arr = temp; //arr[len] = 0; return *this; } int find(const String& s) { char* i = strstr(arr, s.arr); if (i != NULL) { int x = i - arr; cout << x << endl; return x; } cout << "Not Found" << endl; return -1; } int operator [](const String& s) { return find(s); } char at(int x) { return arr[x]; } char operator [](int x) { return at(x); } int copy(char* s, int lenght, int pos = 0) { int i; for (i = 0; i < lenght && i + pos < len; i++) { s[i] = arr[i + pos]; } return i; } int compare(const String& s) { return strcmp(arr, s.arr); } int operator == (const String& s) { if (!(this->compare(s))) return 1; return 0; } int operator >=(const String& s) { if (strcmp(arr, s.arr) == 1 || strcmp(arr, s.arr) == 0) { return 1; } return 0; } int operator <=(const String& s) { if (strcmp(arr, s.arr) == -1 || strcmp(arr, s.arr) == 0) { return 1; } return 0; } int operator >(const String& s) { if (strcmp(arr, s.arr) == 1) { return 1; } return 0; } int operator <(const String& s) { if (strcmp(arr, s.arr) == -1) { return 1; } return 0; } String& reverse() { char* temp = new char[size]; for (int i = 0; i < len; i++) { temp[i] = arr[i]; } for (int i = 0; i < len; i++) { arr[i] = temp[len - i - 1]; } return *this; } void erase(int first, int last) { size = size - (last - first + 1); char* temp = new char[size]; strncpy(temp, arr, first); temp[first] = 0; strcat(temp, arr + last+1); len = size -1; delete[] arr; arr = new char[size]; strcpy(arr, temp); } void insert(char c, int i) { if (i > len || i < 0) { cout << "Wrong index!" << endl; } char* temp = new char[size + 1]; int j; for (j = 0; j < i; j++) { temp[j] = arr[j]; } temp[j + 1] = c; strcat(temp, arr + j - 1); size++; len++; delete[] arr; arr = new char[size]; strcpy(arr, temp); } int getLen() { return len; } friend ostream& operator <<(ostream& os, const String& s); }; ostream& operator << (ostream& os, const String& s) { os << s.arr << "\t Size:" << s.size << "\t Len:" << s.len; return os; } int main() { return 0; }

C++ String