int main(){
  int arr[5]={123, 2, 7563, 36, 756};
  int maximum = max(arr, 5);
  printf("%d", maximum);
  return 0;
}

int max(int arr[], int size){
  int i, *ip, *index_ptr;
  ip = arr;
  for (i=0; i<(size); i++){
    index_ptr = arr+i;
    ip = *ip < *index_ptr ? arr + i : ip;
  }
  return *ip;
}