Cannot convert 'int[*][9]' to 'int**'. Why?

(2 posts)

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ganesh
guest
Posted 1 year ago #

void f (int **mat)
{

}

int main()
{
  int mat[9][9];
  // f(mat); //Doesn't works.
  f ((int **) mat); //Works.
  return 0;
} //Why?

Venki
Moderator
Posted 1 year ago #

The expression 'int[*][9]' is pointer to an array of 9 integers. Which is different from pointer to an integer pointer (int **). See the following example,

char (*pIntArray)[4]; // Pointer to an array of 4 characters
char **pCharChar; // Pointer to character pointer.

If we increment pIntArray by 1, it will be displaced by 4 bytes. Where as, pCharChar will be incremented by only one byte. Hope, makes it clear now.

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