How to find size of array

C program for size of array

#include <stdio.h>

int main( )

{

 int i,num;

 printf("\nEnter the hoe many elements you want?\n");

 scanf("%d",&num);

 int a[num];

 printf("\nEnter the %d elements:\n",num);

 for(i=0;i<num;i++)

 {

  scanf("%d",&a[i]);

 }

 printf("Elements in array are:\n");

 for(i=0;i<num;i++)

 {

  printf("%d\n",a[i]);

 }

 printf(" The size of the array is: %d Bytes.",(int )sizeof(a));

 return 0 ;

}