2023/10/3 -- ARM

今日任务：C++运算符重载实现的过程，代码 

//+运算符
const myString myString::operator+(const myString &s)const{
    myString S;
    delete []S.str;
    S.size = size + s.size;
    S.str = new char[S.size+1];
    strcpy(S.str,str);
    strcat(S.str,s.str);
    return S;
}
//+=运算符
myString &myString::operator+=(const myString &s){
    size += s.size;
    char *p = str;
    delete []str;
    str = new char[size+1];
    strcpy(str,p);
    strcat(str,s.str);
    return *this;
}
//>运算符
bool myString::operator>(const myString &s)const{
    return strcmp(str,s.str) > 0;
}
//[]运算符
char myString::operator[](int index){
    return *(str+index);
}