get pointer value from parameter

I am learning how to use pointers in C and I am having trouble with this little program. In main, I want to get the value in the parameter.

int testing(int *number)  {

   int num = 12;
   number = #
   return 0;
}


int main() {

   int num;
   testing(&num);
   printf("The number is: %d", num);

   return 0;
}

Essentially, I want to print the num pointer after it goes through the testing function. Therefore, I want num to be 12. Currently, when I print num, it is a random number. Any ideas? Thanks.