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  1. #include<iostream>
  2. #include<cstring>
  3. using namespace std;
  4.  
  5. class String
  6. {
  7. private:
  8.     char *s;
  9.     int size;
  10. public:
  11.  
  12.     String(const char *str = NULL); // constructor
  13.     // String(const String&);
  14.     ~String() { delete [] s;  }// destructor
  15.     void print() { cout << s << endl; }
  16.     void change(const char *);  // Function to change
  17. };
  18.  
  19. String::String(const char *str)
  20. {
  21.     size = strlen(str);
  22.     s = new char[size+1];
  23.     strcpy(s, str);
  24. }
  25.  
  26. void String::change(const char *str)
  27. {
  28.     delete [] s;
  29.     size = strlen(str);
  30.     s = new char[size+1];
  31.     strcpy(s, str);
  32. }
  33.  
  34. /* String::String(const String& old_str)
  35. {
  36.     size = old_str.size;
  37.     s = new char[size+1];
  38.     strcpy(s, old_str.s);
  39. }*/
  40. int main()
  41. {
  42.     String str1("GeeksQuiz");
  43.     String str2 = str1;
  44.  
  45.     str1.print(); // what is printed ?
  46.     str2.print();
  47.  
  48.     str2.change("GeeksforGeeks");
  49.  
  50.     str1.print(); // what is printed now ?
  51.    // str2.print();
  52.     return 0;
  53. }
Runtime error #stdin #stdout #stderr 0s 3276KB
comments (?)
stdin 
Standard input is empty
stdout 
GeeksQuiz
GeeksQuiz
stderr 
*** Error in `./prog': double free or corruption (fasttop): 0x0941d008 ***
https://ideone.com/xJtoTf
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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