Why isn't the size of an array parameter the same as within main?

Question

Why isn\'t the size of an array sent as a parameter the same as within main?

#include 

void PrintSize(int p_someArray[10]);

int main () {
           


        

Answer 1

So, you will need to pass the lenght of the array as a second parameter. When you are writing code, in which you both declare an array of constant size, and later pass that array to a function, it is a pain to have the array-length constant show up several places in your code...

K&R to the rescue:

#define N_ELEMENTS(array) (sizeof(array)/sizeof((array)[0])) 

So now you can do e.g:

int a[10];
...
myfunction(a, N_ELEMENTS(a));