What does ‘\0’ mean?

C++ std::strings are “counted” strings – i.e., their length is stored as an integer, and they can contain any character. When you replace the third character with a \0 nothing special happens – it’s printed as if it was any other character (in particular, your console simply ignores it).

In the last line, instead, you are printing a C string, whose end is determined by the first \0 that is found. In such a case, cout goes on printing characters until it finds a \0, which, in your case, is after the third h.

Related Posts:

  1. What is a segmentation fault?
  2. Sleep for milliseconds
  3. C++ Cout & Cin & System “Ambiguous” [closed]
  4. Regular cast vs. static_cast vs. dynamic_cast
  5. What is an unsigned char?
  6. C++ std::priority_queue uses the lambda expression
  7. When to use reinterpret_cast?
  8. Expression must be a modifiable lvalue
  9. How to read a file line by line or a whole text file at once?
  10. Split a string using C++11
  11. error: expected unqualified-id error: Meaning and fix? [duplicate]
  12. How to track down a “double free or corruption” error
  13. undefined reference to `WinMain@16′
  14. How can I clear console
  15. How to go from fopen to fopen_s
  16. TranslateName() function doesn’t work on win10
  17. How to use the PI constant in C++
  18. How to concatenate two strings in C++?
  19. How to get current time and date in C++?
  20. where is the official c++ documentation
  21. wntdll.pdb not loaded – Can’t see the exception
  22. Networking with C++
  23. Error a function-definition is not allowed here before ‘{‘ token
  24. invalid new-expression of abstract class type error
  25. How can I create objects while adding them into a vector?
  26. what does “error : a nonstatic member reference must be relative to a specific object” mean?
  27. “Symbol(s) not found for architecture x86_64” on QtCreator project
  28. Socket Programming in C++
  29. MinGW: “gcc is not recognized as an internal or external command”
  30. Convert Python program to C/C++ code?
  31. std::string formatting like sprintf
  32. Sorting Characters Of A C++ String
  33. Sentinel while loop for C++
  34. How to ensure that a std::map is ordered?
  35. How to write C++ getters and setters
  36. std::out_of_range error?
  37. Checking cin input stream produces an integer
  38. Where do “pure virtual function call” crashes come from?
  39. libpng warning: iCCP: known incorrect sRGB profile
  40. C++: Expression must have a constant value when declaring array inside function
  41. What does ‘const static’ mean in C and C++?
  42. C++ wait for user input
  43. non-standard syntax; use ‘&’ to create a pointer to member
  44. How to shuffle a std::vector?
  45. Understanding glm::lookAt()
  46. How to get current timestamp in milliseconds since 1970 just the way Java gets
  47. What is the best open XML parser for C++?
  48. *** No rule to make target ‘class.cpp’, needed by `build/….x86/class.o` Stop. error in Ubuntu
  49. What’s the difference between opening a file with ios::binary or ios::out or both?
  50. Hash function for a string
  51. CMake error at CMakeLists.txt:30 (project): No CMAKE_C_COMPILER could be found
  52. How to run valgrind with basic c example?
  53. initial value of reference to non-const must be an lvalue
  54. Debug vs Release in CMake
  55. C++ Matrix Class
  56. access violation reading location c++
  57. C++ template constructor
  58. PlaySound in C++ Console application?
  59. Creation of Dynamic Array of Dynamic Objects in C++
  60. Compiling simple Hello World program on OS X via command line
  61. Cannot open output file, permission denied
  62. Strange error C2131: expression did not evaluate to a constant in VC 2015
  63. error: called object type ‘int’ is not a function or function pointer
  64. Hash function for a string
  65. Is there a replacement for unistd.h for Windows (Visual C)?
  66. c++ reading csv file
  67. Why do you use typedef when declaring an enum in C++?
  68. What is wrong with using goto?
  69. Double pointer array in c++
  70. Don’t understand static boolean behavior
  71. How to write std::string to file?
  72. Member declaration not found
  73. What is the difference between a .cpp file and a .h file?
  74. Stable Cotangent
  75. How to change string into QString?
  76. Including .cpp files
  77. creating dynamic array of string c++
  78. How well is Unicode supported in C++11?
  79. The CXX compiler identification is unknown
  80. Is there a standard sign function (signum, sgn) in C/C++?
  81. C++ compiler error: “return type specification for constructor invalid”
  82. error: ISO C++ forbids in-class initialization of non-const static member
  83. Function call missing argument list to create pointer
  84. cannot specify explicit initializer for arrays
  85. What does ** mean in C++?
  86. Incomplete type is not allowed: stringstream
  87. Initializing default values in a struct
  88. Warning: comparison of distinct pointer types
  89. Two decimal places using printf( )
  90. Make / gcc cryptic error 2: how to have more information?
  91. REGSVR32: the module “xxxxx.dll” failed to load … dependent assembly could not be found
  92. Error: expression cannot be used as a function?
  93. What is a .h.gch file?
  94. MinGW .exe requires a few gcc dll’s regardless of the code?
  95. Converting bool to text in C++
  96. clearing a vector of pointers [duplicate]
  97. Evaluate a string with a switch in C++ [duplicate]
  98. C++ JSON Serialization
  99. stack around the variable…was corrupted
  100. Creating a list to hold objects in C++

Leave a Comment