How to check whether a system is big endian or little endian?

Question

How to check whether a system is big endian or little endian?

Answer 1

Another C code using union

union {
    int i;
    char c[sizeof(int)];
} x;
x.i = 1;
if(x.c[0] == 1)
    printf("little-endian\n");
else    printf("big-endian\n");

It is same logic that belwood used.