memcpy不能连续拷贝数据

Question

求助，memcpy为什么不能进行连续的数据拷贝呢？比如：将“you bad boy”写入数组a[100]后,想再将“you good boy”在后边继续写入，在memcpy将地址挪动strlen（“you bad boy”）距离但并不会复制。代码如下：
int _tmain(int argc, _TCHAR* argv[])
{
/*
HANDLE hMutex;
hMutex = OpenMutex(MUTEX_ALL_ACCESS, FALSE, _T("SRTM_MUTEX"));

if (hMutex == NULL)
{
    printf("Open Mutex failed");
}

WaitForSingleObject(hMutex, INFINITE);
Sleep(10000);
*/
void *pbufout=NULL;
char s[100]="you bad boy";
char b[1000]="";

memcpy(b,s,sizeof(s));
pbufout = b;
pbufout = (int*)pbufout + sizeof(s);

sprintf_s(s,"you good boy");
memcpy(b + sizeof(s), s, sizeof(s));
return 0;

}

Answer 1

sizeof(s) = 100；

memcpy(b + sizeof(s), s, sizeof(s));

请查看b[100] 里面的数据。。。。