2.
typedef unsigned char *byte_pointer;
void show_bytes(byte_pointer start, size_t len) {
int i;
for (i=0;i<len;i++)
printf(" %.2x",start[i];
printf("\n");
}
void inplace_swap(int *x,int *y) {
*y = *x^*y;
*x = *x^*y;
*y = *x^*y;
}
computer systems work from a programmer's perspective
原文：http://www.cnblogs.com/oh-mine/p/5901881.html