又是个c++入门问题

#include <iostream.h>main(){ int i; int j; cout<<"i in outer block is"<<i<<"\n"; cout<<"j in outer block is"<<j<<"\n"; cout<<"k in outer block is"<<k<<"\n"; { int k; cout<<"i in inner block is"<<i<<"\n"; cout<<"j in inner block is"<<j<<"\n"; cout<<"k in inner block is"<<k<<"\n"; } cout<<"i back in outer block is"<<i<<"\n"; cout<<"j back in outer block is"<<j<<"\n"; cout<<"k back in outer block is"<<k<<"\n";}这样运行出错改成这样#include <iostream.h>main(){ int i; int j; int k; cout<<"i in outer block is"<<i<<"\n"; cout<<"j in outer block is"<<j<<"\n"; cout<<"k in outer block is"<<k<<"\n"; { cout<<"i in inner block is"<<i<<"\n"; cout<<"j in inner block is"<<j<<"\n"; cout<<"k in inner block is"<<k<<"\n"; } cout<<"i back in outer block is"<<i<<"\n"; cout<<"j back in outer block is"<<j<<"\n"; cout<<"k back in outer block is"<<k<<"\n";}可以运行，但为什么不是书上的结果啊？书上的是8886   18    0我的结果是2130567168   4246980   4248082

这个结果是随机值，因为你没有初始化，所以取到的值很可以是以前用过的残留数据，即脏数据，所以估计这次和下次的运行结果都不一样！