Trying to return values in C from Array

 #include <stdio.h>

int a, b;

int main() {
   int *p;
   a = 2;
   b = 15;
   p = intToBin(a,b);
   printf("The value of the return value p is: %d\n",p);
}

int * intToBin(int a, int b) {
    while(b > 0) {
        c = b /a;
        d = b % a;
        printf("The expansion of %d is: %d * %d + %d\n",b,c,a,d);      
        b = c;
     }
 return 5;
}

This does not work.

I am trying to pull in what I have written for this:
https://www.youtube.com/watch?v=8afbTaA-gOQ

Perhaps I will check out:
https://overiq.com/c-programming-101/returning-a-pointer-from-a-function-in-c/

trying: https://www.tutorialspoint.com/cprogramming/c_return_arrays_from_function.htm

https://www.geeksforgeeks.org/how-to-return-multiple-values-from-a-function-in-c-or-cpp/
try to returning exponent and array:    ^^^^

The message I am getting from messing with this is, don't mix structs with arrays in them with pointers to structs as return types. It gets one into trouble.