How to Know the processor is Big Endian or Little Endian

[SatishAradhya]

Been bothering me so long, what is the way to find the endians of processor ?I've tried using Union,but im getting result confused in understanding the outcome

anyone please help me

[Banfa]

Normally processor on which it can be set also set a preprocessor symbol to indicate which endian is in use. If you really need to find it programatically

int i = 1;
char *pc = (char *)&i;
 
if ( *pc == 1 )
{
    /* little endian */
}
else
{
    /* Big endian */
}
 

This of course assumes that the are only 2 endians, big and little. This assumption is not actually true although it does cover the majority of cases.