Is the sizeof(some pointer) always equal to four?

he guarantee you get is that sizeof(char) == 1. There are no other guarantees, including no guarantee that sizeof(int *) == sizeof(double *).

In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but there’s nothing to be gained in relying on a given size.

Related Posts:

  1. What does “dereferencing” a pointer mean?
  2. What does “dereferencing” a pointer mean?
  3. What is the difference between const int*, const int * const, and int const *?
  4. What is the difference between const int*, const int * const, and int const *?
  5. How to make an array with a dynamic size? General usage of dynamic arrays (maybe pointers too)?
  6. Typedef function pointer?
  7. What is the use of intptr_t?
  8. Why use pointers?
  9. What’s the difference between * and & in C?
  10. Warning: comparison of distinct pointer types
  11. Difference between the int * i and int** i
  12. What is a segmentation fault?
  13. What is the difference between float and double?
  14. Why are #ifndef and #define used in C++ header files?
  15. Floating point exception( core dump
  16. Return array in a function
  17. Mutex example / tutorial? [closed]
  18. Regular cast vs. static_cast vs. dynamic_cast
  19. What is an unsigned char?
  20. What is a smart pointer and when should I use one?
  21. Convert char to int in C and C++
  22. How to fix a “invalid operands to binary expression” error?
  23. How to track down a “double free or corruption” error
  24. How to go from fopen to fopen_s
  25. What is a dangling pointer?
  26. What does `*&` in a function declaration mean?
  27. (->) arrow operator and (.) dot operator , class pointer
  28. Difference between long double and double in C and C++ [duplicate]
  29. What is use of c_str function In c++
  30. What is the C version of RMI
  31. How to print pthread_t
  32. What is uintptr_t data type
  33. Pointer to incomplete class type is not allowed
  34. Fastest way to check if a file exist using standard C++/C++11,14,17/C?
  35. Difference between using Makefile and CMake to compile the code
  36. What is the difference between a static and const variable?
  37. Should I learn C before learning C++?
  38. Eclipse C++ : “Program “g++” not found in PATH”
  39. Visual Studio debugger error: Unable to start program Specified file cannot be found
  40. unsigned int vs. size_t
  41. Convert Python program to C/C++ code?
  42. error: expected primary-expression before ‘)’ token (C)
  43. What does ** do in C language?
  44. Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
  45. What is activation record in the context of C and C++?
  46. How to create a dynamically-allocated array of const objects, but have values assigned to them?
  47. Fastest way to check if a file exist using standard C++/C++11,14,17/C?
  48. How to access the contents of a vector from a pointer to the vector in C++?
  49. Fatal error: ‘stdafx.h’ file not found
  50. warning: control reaches end of non-void function [-Wreturn-type]
  51. C++: Expression must have a constant value when declaring array inside function
  52. gcc/g++: “No such file or directory”
  53. What does ‘const static’ mean in C and C++?
  54. Sorting Linked List C++ with pointers
  55. Delete 2D array C++
  56. Best C/C++ Network Library
  57. 2D array vs array of arrays
  58. How do malloc() and free() work?
  59. How to run valgrind with basic c example?
  60. C++ strings and pointers
  61. initial value of reference to non-const must be an lvalue
  62. Debug vs Release in CMake
  63. How can I get the list of files in a directory using C or C++?
  64. C++ – Assigning null to a std::string
  65. What are the different versions of exec used for in C and C++?
  66. What’s the difference between nexti and stepi in gdb?
  67. C++ – Too Many Initializers for Arrays
  68. Reading string by char till end of line C/C++
  69. Is there a replacement for unistd.h for Windows (Visual C)?
  70. C++ – include unistd.h: why not cunistd?
  71. error: invalid initialization of non-const reference of type ‘int&’ from an rvalue of type ‘int’
  72. How to project a point onto a plane in 3D?
  73. Using C-string gives Warning: “Address of stack memory associated with local variable returned”
  74. gcc: undefined reference to
  75. Reference to non-static member function must be called
  76. I get this error: “glibc detected”
  77. Difference between pic Vs pie
  78. What does ** mean in C?
  79. Double pointer array in c++
  80. What’s the meaning of exception code “EXC_I386_GPFLT”?
  81. C++ pass an array by reference
  82. Get size of pointer in C
  83. C: pointer to array of pointers to structures (allocation/deallocation issues)
  84. gcc -g :what will happen
  85. What is the source of the data for the ProgramFiles, ProgramW6432Dir, ProgramFilesDir (x86), CommonProgramFiles environment variables?
  86. What is the job of autogen.sh when building a c++ package on Linux
  87. What’s the Use of ‘\r’ escape sequence?
  88. Is there a standard sign function (signum, sgn) in C/C++?
  89. Why should I use a pointer rather than the object itself?
  90. Using OpenMP with clang
  91. C++ correct way to return pointer to array from function
  92. Two decimal places using printf( )
  93. Initializing pointers in C++
  94. Fatal error: iostream: No such file or directory in compiling C program using GCC
  95. Is there a way to compile C++ to C Code?
  96. What is a `char*`?
  97. clearing a vector of pointers [duplicate]
  98. Whats the difference between UInt8 and uint8_t
  99. C++ Swapping Pointers
  100. Array of Linked Lists C++

Leave a Comment