C programming working with multidimensional array

Applications Programming
1

Hi,
I have the following variable declaration which looks like a 3d array or N matrixs KxK of floats
float (*table[N])[K];
I have to pass to a function only the first table.
How can I do it??
Thanks

2

Pass the first element table[0] which is the first table to the function.

3

What should the formal parameter be?? I tried
float **table
but doesn't work

4

What do you mean by formal parameter. In caller the called function takes arguments and in the called those arguments are known as parameters. If x calls y then...

/* 
 * table: an array[N] of pointers to an array[K] of floats
 * table[0]: pointer to an array[K] of floats
 */
x() {y(table[0]);}

y(float (*pf)[K]) {}
5

ok, it works fine. thanks very much. Could you explain me why

y(float **pf){}

is not correct and in which cases i have to use it?

6

float **pf is not correct because it is a pointer to pointer to float i.e. dual level pointer while each element of the array table is a pointer to an array of floats...

x()
{
  float x;      /* x is a variable of type float */
  float *pf;    /* pf is a pointer to float */
  float **ppf;  /* ppf is a pointer to pointer to float */

  pf = &x;      /* pf now points to x */
  ppf = &pf;    /* ppf now points to pf */
}
7

ok, thanks very much.