To find out big endian or little endian

#include<stdio.h>
int main()
{
             unsigned int i = 1;
             char *c = (char*)&i;
             if (*c)
                   printf("Little endian");
             else
                   printf ("Big endian");
             getchar ();
          return 0;
}
In the above program, a character pointer c is pointing to an integer i. Since size of character is 1 byte when the character pointer is de-referenced it will contain only first byte of integer. If machine is little endian then *c will be 1 (because last byte is stored first) and if machine is big endian then *c will be 0.