1、array类
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(1)、代码如下：
#include
using namespace std;
class Array{
public:
Array(int count);
Array(const Array &t);
~Array();
public:
void setData(int i, int data);
int getData(int i);
int length();
private:
int len;
int *p;
};
Array::Array(int count){
len = count;
p = new int[len];
}
//有指针,的进行深拷贝;
Array::Array(const Array &t){
len = t.len;
p = new int[len];
for(int i = 0; i < t.len; i++){
p[i] = t.p[i];
}
}
Array::~Array(){
if(p){
delete []p;
p = NULL;
}
}
void Array::setData(int i, int data){
p[i] = data;
}
int Array::getData(int i){
return p[i];
}
int Array::length(){
return len;
}
int main(void){
Array array(10);
int i;
for(i = 0; i < array.length(); i++){
array.setData(i, i);
}
for(i = 0; i < array.length(); i++){
cout<(2)、运行结果：
2、string类
(1)、代码如下：
#include
#include
#include
using namespace std;
class MyString{
public:
friend ostream& operator<<(ostream &out, const MyString &s1);
friend istream& operator>>(istream &in, MyString &s2);
MyString(int len = 0){ //默认参数看我们是否自己开辟大小的空间;
if(len != 0){
m_len = len;
m_p = new char[m_len+1];
memset(m_p, 0, m_len);
}else{
m_len = 0;
m_p = new char[m_len+1];
strcpy(m_p, "");
}
}
MyString(const char *p){
if(p == NULL){
m_len = 0;
m_p = new char[m_len+1];
strcpy(m_p, "");
}else{
m_len = strlen(p);
m_p = new char[m_len+1];
strcpy(m_p, p);
}
}
MyString(const MyString &s){
m_len = s.m_len;
m_p = new char[m_len+1];
strcpy(m_p, s.m_p);
}
MyString& operator=(const MyString &t){
if(m_p){
delete []m_p;
m_p = NULL;
m_len = 0;
}
m_len = t.m_len;
m_p = new char[m_len+1];
strcpy(m_p, t.m_p);
return *this;
}
~MyString(){
if(m_p) {
delete []m_p;
m_p = NULL;
m_len = 0;
}
}
public:
MyString operator=(const char *p){
if(m_p){
delete []m_p;
m_p = NULL;
m_len = 0;
}
if(p == NULL){
m_len = 0;
m_p = new char[m_len+1];
strcpy(m_p, "");
}else{
m_len = strlen(p);
m_p = new char[m_len+1];
strcpy(m_p, p);
}
return *this;
}
char& operator[](int index){
return m_p[index];
}
bool operator==(const char *p)const{ //判断与字符串是否相等,看长度和里面的内容是否相等!!!
if(p == NULL){
if(m_len == 0){
return true;
}else{
return false;
}
}else{
if(m_len == strlen(p)){
return !strcmp(m_p, p);
}else{
return false;
}
}
}
bool operator==(const MyString &s)const{
if(m_len != s.m_len){
return false;
}
return !strcmp(m_p, s.m_p);
}
bool operator!=(const char *p)const{
return !(*this == p);
}
bool operator!=(const MyString &s)const{
return !(*this == s);
}
int operator<(const char *p)const{
return strcmp(m_p, p);
}
int operator<(const MyString &s)const{
return strcmp(m_p, s.m_p);
}
int operator>(const char *p)const{
return strcmp(p, m_p);
}
int operator>(const MyString &s)const{
return strcmp(s.m_p, m_p);
}
//怎么样把类的指针露出来.
public:
char *c_str(){
return m_p;
}
const char *c_str2(){
return m_p;
}
int length(){
return m_len;
}
private:
int m_len;
char *m_p;
};
ostream& operator<<(ostream &out, const MyString &s1){
out<>(istream &in, MyString &s2){
in>>s2.m_p;
return in;
}
int main(void){
MyString s1;
MyString s2("s2");
MyString s3 = s2;
MyString s4 = "s444444444444";
s4 = "s22222222222";
s4 = s2;
s4[1] = '3';
printf("%c\n", s4[1]); //测试[]改变值了吗?
cout<>s9;
cout<(2)、运行结果:
网站名称：array和string的运算符重载
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