C: Correctly freeing memory of a multi-dimensional array

Question

Say you have the following ANSI C code that initializes a multi-dimensional array :

int main()
{
      int i, m = 5, n = 20;
      int **a = malloc(m * sizeo         


        

Answer 1

I would call malloc() and free() only once:

#include 
#include  

int main(void){
  int i, m = 5, n = 20;
  int **a = malloc( m*(sizeof(int*) + n*sizeof(int)) );

  //Initialize the arrays
  for( a[0]=(int*)a+m, i=1; i