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試題五：

閱讀下列說明和C++代碼，將應填入()處的字句寫在對應欄內。

說明：

在某系統(tǒng)中，類interval代表由下界(lower bound)和上界(upper bound)定義的區(qū)間。要求采用不同的格式顯示區(qū)間范圍。如【lower bound.upper bound】;【lower bound...upper bound】;【lower bound-upper bound】.等現(xiàn)采用策略(strategy)模式實現(xiàn)該要求，得到如圖6-1所示的類圖。

【c++代碼】

include using namespace std;

class Print strategy{

Public:

}(1) ;

class Interval{

Private:

double lower Bound;

double upper Bound;

Public

Interval (double P-lower,double P-upper ){

lower Bound=P-lower;

upper Bound=P-upper;

}void Print Interval (Print strategy prt ){

}2

double get lower (){

return lower Bound}

double get upper{

return upper Bound}

}

class Print Intervals (Comma: Public PrintsStrategy{

public:

void do Print (Interval *val ){

cout《“[＂《val→getLower()《“，”《val(→getupper()《”"]"《

end (:｝

}:

class Print IntervalsDots :Public PrintStrategy{

Public:

void do Print (Interval*val(){

cout《＂[＂《val→getLower()《"..."《val→getupper

()《"】"《

end li｝

｝:

class Print Intervals Line: Public PrintStrategy{

Public:

Void do Print (Interval*val(){

cout《＂[＂《val→getLower(）《“...”《val→getupper

()《"]”《

end li｝

enum TYPE COMMA.DOTs.LINE}

Print strategy*get strategy cint type

Print strategy*sti

switch(type){

case COMMA:

(3);

break;

case Dots:

(4)；

break:case LINE:

(5):

break:

}

return st;

}

int main(){

Interval a(1.7,2.1);

a.Print Interval(get strategy(commA);

a.Print Interval(get strategy(DoTs);

a.Print Interval(get strategy(LINE);

} return 0;