C compile error Variable-sized object may not be initialized

Question

Why do I receive the error  Variable-sized object may not be initialized  with the following code    int boardAux length  length      0

User · Answer

The question is already answered but I wanted to point out another solution which is fast and works if length is not meant to be changed at run-time. Use macro #define before main() to define length and in main() your initialization will work:

#define length 10

int main()
{
    int boardAux[length][length] = {{0}};
}

Macros are run before the actual compilation and length will be a compile-time constant (as referred by David Rodríguez in his answer). It will actually substitute length with 10 before compilation.

User · Answer

int size 5  int ar size    O       This  operation gives an error -   variable sized array may not be  initialised   Then just try this      int size 5 i  int ar size   for i 0 i lt size i          ar i  0

User · Answer

Simply declare length to be a cons  if it is not then you should be allocating memory dynamically

User · Answer

You receive this error because in C language you are not allowed to use initializers with variable length arrays  The error message you are getting basically says it all      6 7 8 Initialization               3 The type of the entity to be initialized shall be   an array of unknown size or an object   type that is not a variable length   array type

User · Answer

After declaring the array  int boardAux length  length     the simplest way to assign the initial values as zero is using for loop  even if it may be a bit lengthy  int i  j  for  i   0  i lt length  i          for  j   0  j lt length  j            boardAux i  j    0

User · Answer

I am assuming that you are using a C99 compiler  with support for dynamically sized arrays   The problem in your code is that at the time when the compilers sees your variable declaration it cannot know how many elements there are in the array  I am also assuming here  from the compiler error that length is not a compile time constant     You must manually initialize that array   int boardAux length  length   memset  boardAux  0  length length sizeof int

User · Answer

This gives error    int len  scanf   d   amp len   char str len        This also gives error   int len 5  char str len        But this works fine   int len 5  char str len     so the problem lies with assignment not declaration   You need to put value in the following way   str 0   a   str 1   b     like that  and not like str  ab

User · Answer

For C   separate declaration and initialization like this    int a n  m    a n  m    0

User · Answer

The array is not initialized with the memory specified anf throws an error variable sized array may not be initialised I prefer usual way of initialization  for  i   0  i  lt   bins  i            arr i    0

User · Answer

You cannot do it  C compiler cannot do such a complex thing on stack   You have to use heap and dynamic allocation   What you really need to do    compute size  nmsizeof element   of the memory you need call malloc size  to allocate the memory create an accessor  int  access ptr x y rowSize    return ptr   y rowSize   x      Use  access boardAux  x  y  size    42  to interact with the matrix

[c] C compile error: "Variable-sized object may not be initialized"

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