《C++面向对象程序设计》课件第7章.ppt

三、阅读下列程序，写出执行结果

1．#includeiostream

usingnamespacestd;

templatetypenameT

voidfun(Tx,Ty)

{Ttemp;

temp=x;x=y;y=temp;

}

voidmain(){inti,j;

i=10;j=20;

fun(i,j);

couti=i\tj=jendl;

doublea,b;

a=1.1;b=2.2;

fun(a,b);

couta=a\tb=bendl;

}2.#includeiostream

usingnamespacestd;

templatetypenameT

classBase

{public:

Base(Ti,Tj){x=i;y=j;}

Tsum(){returnx+y;}

private:

Tx,y;

};voidmain()

{Basedoubleobj2(3.3,5.5);

coutobj2.sum()endl;

Baseintobj1(3,5);

coutobj1.sum()endl;

}3．#includeiostream

#includeset

usingnamespacestd;

voidmain()

{ setints;

setint::iteratorpos;

s.insert(4);

s.insert(3); s.insert(2);

s.insert(1);

couts.size:s.size()endl;

couts:;

for(pos=s.begin();pos!=s.end();pos++)

cout*pos;

coutendl;

}4．分析下面的程序的运行结果，说明队列的读写过程。

#includeiostream

usingnamespacestd;

constintMaxSize=20;

templateclassTypeclassQueue

{

Typedata[MaxSize];

inthead,tail;

public: Queue(){head=0;tail=0;}

voidclear(){head=0;tail=0;}

voidinput(Typex);

Typegetout();

intempty()const{returnhead==tail;}

voidprintQueue()const;

voidprintData()const;

};templateclassType

voidQueueType::input(Typex)

{

try{

if((tail+1)%MaxSize==head)throw1;

tail=(tail+1)%MaxSize;

data[tail]=x;

}

catch(int)

{

coutQueueoverflow!endl;

}

}templateclassTypeTypeQueueType::getout()

{

Typetemp;

try{

if((head==tail))throw0;

else{

head=(head+1)%MaxSize;

temp=data[head];

}

returntemp; }

catch(int){

coutQueueempty!endl;

}

}

templateclassTypevoidQueueType::printQueue()const

{

coutprintqueue:endl;

inth=head,t=tail; if(empty()){coutqueueemptyendl;return;}

if(ht)for(inti=h+1;i=t;i++)coutdata[i];

else{

for(inti=h+1;iMaxSize;