How to find the given number is little endian or big endian?

#include <stdio.h>
int main()
{
  unsigned int n = 1;
  char *p;
  p = (char*)&n;
  if (*p == 1)
  printf("Little Endian\n");
  else if (*(p + sizeof(int) - 1) == 1)
  printf("Big Endian\n");
  else
  printf("Surprise output!!!!\n");
  return 0;
}