Justification

Variables of array types are treated as pointers when passed as arguments. As a result the sizeof operator will return the size of the array type instead of the size of the array. This is not intuitive and can easily lead to mistakes.

Example

void m1(char a[100]) {
   int x = sizeof(a); /* WRONG, x == 4 or x == 8 */
}     

void m2(void) {
   char a[100] = { 0 };
   int x = sizeof(a); /* RIGHT, x == 100 */
}