Passing multidimensional arrays as function arguments in C

by

Pass an explicit pointer to the first element with the array dimensions as separate parameters. For example, to handle arbitrarily sized 2-d arrays of int:

void func_2d(int *p, size_t M, size_t N)
{
  size_t i, j;
  ...
  p[i*N+j] = ...;
}

which would be called as

...
int arr1[10][20];
int arr2[5][80];
...
func_2d(&arr1[0][0], 10, 20);
func_2d(&arr2[0][0], 5, 80);

Same principle applies for higher-dimension arrays:

func_3d(int *p, size_t X, size_t Y, size_t Z)
{
  size_t i, j, k;
  ...
  p[i*Y*Z+j*Z+k] = ...;
  ...
}
...
arr2[10][20][30];
...
func_3d(&arr[0][0][0], 10, 20, 30);

More Related Contents:

  1. Strange warning in a C function const multidimensional-array argument
  2. Manipulate multidimensional array in a function
  3. How to return matrix (2D array) from function? (C)
  4. How can I malloc a struct array inside a function? Code works otherwise
  5. Which library has power function? [closed]
  6. error: incompatible types for a function that returns float in C
  7. casting void** to 2D array of int – C
  8. strdup() – what does it do in C?
  9. How to pass 2D array (matrix) in a function in C?
  10. Passing an array as an argument to a function in C
  11. C function syntax, parameter types declared after parameter list
  12. Nested function in C
  13. Map a 2D array onto a 1D array
  14. Macro vs Function in C
  15. Pass an array to a function by value
  16. Array to pointer decay and passing multidimensional arrays to functions
  17. X,Y passing size for the array in C function
  18. strcpy() return value
  19. C function calls: Understanding the “implicit int” rule
  20. C error: undefined reference to function, but it IS defined
  21. What do the parentheses around a function name mean?
  22. Freaky way of allocating two-dimensional array?
  23. Returning Arrays/Pointers from a function
  24. Why use an asterisk “[*]” instead of an integer for a VLA array parameter of a function?
  25. How can I return a character array from a function in C?
  26. Unspecified number of parameters in C functions – void foo()
  27. Returning from a void function [closed]
  28. Function declaration inside of function — why?
  29. Why is the size of a function in C always 1 byte?
  30. C pointer notation compared to array notation: When passing to function

Leave a Comment