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String.cpp
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79 lines (70 loc) · 1.26 KB
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#include "String.h"
String::String() {
size = 0;
str = new char[1];
str[0] = '\0';
}
String::String(char c) {
size = 1;
str = new char[2];
str[0] = c;
str[1] = '\0';
}
String::String(const char* s) {
size = 0;
const char* temp = s;
while (*temp != '\0') {
size++;
temp++;
}
str = new char[size + 1];
for (int i = 0; i < size; i++) {
str[i] = s[i];
}
str[size] = '\0';
}
String::String(const String& s) {
size = s.size;
str = new char[size + 1];
for (int i = 0; i < size; i++) {
str[i] = s.str[i];
}
str[size] = '\0';
}
String::~String() {
delete[] str;
}
char& String::operator[](int index) {
return str[index];
}
String& String::operator=(String& s) {
delete[] str;
size = s.size;
str = new char[size + 1];
for (int i = 0; i < size; i++) {
str[i] = s.str[i];
}
str[size] = '\0';
return *this;
}
String& String::operator+=(String& s) {
int newSize = size + s.size;
char* newStr = new char[newSize + 1];
for (int i = 0; i < size; i++) {
newStr[i] = str[i];
}
for (int i = 0; i < s.size; i++) {
newStr[size + i] = s.str[i];
}
newStr[newSize] = '\0';
size = newSize;
delete[] str;
str = newStr;
return *this;
}
ostream& operator<<(ostream &out, String &s) {
for (int i = 0; i < s.size; i++) {
out << s.str[i];
}
return out;
}