053:指针练习：SwapMemory

053:指针练习：SwapMemory
总时间限制: 1000ms 内存限制: 65536kB
描述
填写内存交换函数 SwapMemory，使得程序输出指定结果

#include 
using namespace std;
void SwapMemory(void * m1,void * m2, int size)
{
// 在此处补充你的代码
}

void PrintIntArray(int * a,int n)
{
    for(int i = 0;i < n; ++i)
        cout << a[i] << ",";
    cout << endl;
}

int main()
{
    int a[5] = {1,2,3,4,5};
    int b[5] = {10,20,30,40,50};
    SwapMemory(a,b,5 * sizeof(int));
    PrintIntArray(a,5);
    PrintIntArray(b,5);
    char s1[] = "12345";
    char s2[] = "abcde";
    SwapMemory(s1,s2,5);
    cout << s1 << endl;
    cout << s2 << endl;
    return 0;
}

输入
无
输出
10,20,30,40,50,
1,2,3,4,5,
abcde
12345
样例输入
无
样例输出
10,20,30,40,50,
1,2,3,4,5,
abcde
12345
来源
Guo Wei
代码

#include 
using namespace std;
void SwapMemory(void * m1,void * m2, int size)
{// 在此处补充你的代码
char *m11=(char *)m1;
char *m22=(char *)m2;

    while(size--){
        *(m11+size)=(*(m22+size))^(*(m11+size));
        *(m22+size)=(*(m22+size))^(*(m11+size));
        *(m11+size)=(*(m22+size))^(*(m11+size));}
}

void PrintIntArray(int * a,int n)
{
    for(int i = 0;i < n; ++i)
        cout << a[i] << ",";
    cout << endl;
}

int main()
{
    int a[5] = {1,2,3,4,5};
    int b[5] = {10,20,30,40,50};
    SwapMemory(a,b,5 * sizeof(int));
    PrintIntArray(a,5);
    PrintIntArray(b,5);
    char s1[] = "12345";
    char s2[] = "abcde";
    SwapMemory(s1,s2,5);
    cout << s1 << endl;
    cout << s2 << endl;
    return 0;
}

注意：m1和m2可能地址有冲突，交换值要从高位到低位