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  1. #include <iostream>
  2.  
  3. class Mystr{
  4.     private:
  5.         int length;
  6.         char *text;
  7.  
  8.     public:
  9.         Mystr();
  10.         Mystr(const char*);
  11.         Mystr(const Mystr &obj);
  12.         Mystr(int);
  13.         ~Mystr();
  14.  
  15.         void print();
  16.         int count(const char);
  17.         int len(){
  18.             return length;
  19.         }
  20.  
  21.         Mystr operator+(const Mystr &obj);
  22.         Mystr operator=(const Mystr &obj);
  23.  
  24. };
  25.  
  26. Mystr::Mystr(const char* str){
  27.     length = 0;
  28.     while (str[length] != '\0'){
  29.         length++;
  30.     }
  31.     text = new char[length+1];
  32.     for (int i = 0;i <= length;i++){
  33.         text[i] = str[i];
  34.     }
  35.     std::cout << "char* constructor is triggered" << std::endl;
  36. }
  37. Mystr::Mystr(){
  38.     length = 0;
  39.     text = NULL;
  40. }
  41. Mystr::Mystr(const Mystr &obj){
  42.     length = obj.length;
  43.     text = new char[length+1];
  44.     for (int i = 0;i <= obj.length;i++){
  45.         text[i] = obj.text[i];
  46.     }
  47.     std::cout << text << ": "<< "copy constructor is triggered" << std::endl;
  48. }
  49. Mystr::~Mystr(){
  50.     std::cout << text << ": ";
  51.     delete[] text;
  52.     std::cout << "destructor is triggered\n"; 
  53. }
  54. Mystr::Mystr(int n){
  55.     if (n > 0){
  56.         length = n;
  57.         text = new char[n+1];
  58.         text[n] = '\0';
  59.         while (n--){
  60.             text[n] = '*';
  61.         }
  62.     }else{
  63.         length = 0;
  64.         text = NULL;
  65.     }
  66.     std::cout << "int constructor is triggered" << std::endl;
  67. }
  68.  
  69. void Mystr::print(){
  70.     for (int i = 0;i < length;i++){
  71.         std::cout << text[i];
  72.     } 
  73.     std::cout << std::endl;
  74. }
  75.  
  76. int Mystr::count(const char c){
  77.     int res = 0;
  78.     for (int i = 0; i < length;i++){
  79.         if (text[i] == c) res++;
  80.     }
  81.     return res;
  82. }
  83.  
  84. Mystr Mystr::operator+(const Mystr &obj){
  85.     Mystr res;
  86.     res.length = this->length + obj.length;
  87.     res.text = new char[res.length + 1];
  88.     for (int i = 0;i < this->length;i++){
  89.         res.text[i] = this->text[i];
  90.     }
  91.     for (int i = 0;i <= obj.length;i++){
  92.         res.text[this->length + i] = obj.text[i];
  93.     }
  94.     std::cout << "operator+ is triggered" << std::endl;
  95.     return res;
  96. }
  97. Mystr Mystr::operator=(const Mystr &obj){
  98.     if (this != &obj){
  99.         length = obj.length;
  100.         delete[] this->text;
  101.         text = new char[length+1];
  102.         for (int i = 0;i <= obj.length;i++){
  103.             this->text[i] = obj.text[i];
  104.         }
  105.     }
  106.     std::cout << "operator= is triggered" << std::endl;
  107.     return *this;
  108. }
  109.  
  110. int main(){
  111.     Mystr *pstr = new Mystr("Hello");
  112.     Mystr test1 = *pstr;
  113.     Mystr test2 = test1 + " World";
  114.     Mystr test3 = test2 + 3.14;
  115.     *pstr = test1 = test1;
  116.     test1.print();
  117.     test2.print();
  118.     test3.print();
  119.     std::cout << test1.count('l') << " " << test2.len() << std::endl;
  120.     delete pstr;
  121.  
  122.     return 0;
  123. }
Success #stdin #stdout 0s 4348KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
char* constructor is triggered
Hello: copy constructor is triggered
char* constructor is triggered
operator+ is triggered
 World: destructor is triggered
int constructor is triggered
operator+ is triggered
***: destructor is triggered
operator= is triggered
Hello: copy constructor is triggered
operator= is triggered
Hello: copy constructor is triggered
Hello: destructor is triggered
Hello: destructor is triggered
Hello
Hello World
Hello World***
2 11
Hello: destructor is triggered
Hello World***: destructor is triggered
Hello World: destructor is triggered
Hello: destructor is triggered
https://ideone.com/A1iQ3Y
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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