指针类型转换后, 指针值会改变

#include<cstdlib>
#include<iostream>

usingnamespacestd;

structIBase
...{
inta;
};

structIA:publicIBase
...{
intaaa;
};

structIB:publicIBase
...{
intbbb;
};

structCChild:publicIA,publicIB
...{
intccc;
};

intmain(intargc,char*argv[])
...{
CChild*pC=newCChild;
IB*pB=(IB*)pC;

assert(pB==pC);
assert((void*)pB!=(void*)pC);
cout<<pC<<""<<pB<<endl;
system("PAUSE");
returnEXIT_SUCCESS;
}