《深入理解计算机系统》（第二版）第二章中的一题目

#include <stdio.h>                                      
#include <stdlib.h>
#include <malloc.h>
#include <math.h>
#include <string.h>
typedef unsigned char *byte_pointer;
void show_bytes(byte_pointer s){
    printf("%c ",s);
    printf("\n");
}
void inplace_swap(int *x,int *y){
    *y=*x ^ *y;
    show_bytes((byte_pointer)*x);
    show_bytes((byte_pointer)*y);
    printf("\n");
    *x=*x ^ *y;
    show_bytes((byte_pointer)*x);
    show_bytes((byte_pointer)*y);
    printf("\n");
    *y=*x ^ *y;
    show_bytes((byte_pointer)*x);
    show_bytes((byte_pointer)*y);
    printf("\n");
}
void main()
{   
    int m=0x61,n=0x62;
    printf("原来x为%c ",(byte_pointer)m);
    printf("原来y为%c ",(byte_pointer)n);
    printf("\n");
    inplace_swap(&m,&n);
    show_bytes((byte_pointer)m);
    show_bytes((byte_pointer)n);    
}