LE BE

#include <stdio.h>
#include <stdint.h>

int main(int argc, char *argv[])
{
    int i;
    uint32_t x = 0xAABBCCDD;
    uint8_t *p = (uint8_t *)&x;

    printf("x:  %08x\n", x);
    for(i = 0; i < sizeof(x); i++)
        printf("p[%d]:  %02x\n", i, p[i]);

    printf("Machine is %cE\n", p[0] == x >> 24 ? 'B' : 'L');

    return 0;
}