Array length counting anomaly
#include <stdio.h>
int len(int[]);

int main (int argc, const char * argv[])
{
    int a[]={1,2,3,4,5,6,7,8};
    int* i = a;
    printf("length is %d",(len(i)));
    return 0;
}

int len(int* a){
    int count = 0;
    for (; *a!=''; a++) {
        count++;
    }
    return count;
}

size_t length = sizeof(a) / sizeof(a[0]);

int a[] = {1,2,3,4,5,6,7,8};
size_t length = sizeof(a) / sizeof(a[0]);

// In this case, sizeof(a[0])
// is the same as sizeof(int), because it's an int array.

int *a = malloc(sizeof(int) * 10);
size_t length = sizeof(a) / sizeof(a[0]); // WRONG!