Miscalculation of array size inside a function

Question

The following C program:

int doStuff(int afm[]);

int main(){
    int afm1[9] = {1,2,3,4,5,6,7,8,9}; //size=9

    int afmLength = sizeof(afm1)/sizeof(int);
         


        

Answer 1

Because in main you have an array and in the function you have a pointer to that array.

int doStuff(int afm[])

is equivalent to

int doStuff(int *afm)