有如下程序: #include<iostream> using namespace std; class Amount{ int amount; public: Amount(int n=0):amount(n){} int getAmount()const{return amount;} Amount&operator9=(Amount a){ amount+=a. amount; return______; } }; int main(){ Amount x(3),y(7); x+=y, cout<<x. getAmount()<<endl; return 0; }已知程序的运行结果是10,则下划线处缺失的表达式是
A.* this
B.this
C.&amount
D.amount
第1题:
如下程序的输出结果是 #include<iostream> void fun(int & X,inty){intt=x;x=y;y=t;} int main( ){ int a[2]={23,42}; fun(a[1],a[0]); std::cout<<a[0]<<","<<a[1]<<std::endl; return 0; }
A.42,42
B.23,23
C.23,42
D.42,23
第2题:
第3题:
BookStore数据库中有销售明细表OrderDetail(OrderCode, BookCode, Amount) 查询销售总量前20%的图书,并按总销量降序排列。SQL语句: SELECT TOP 20 PERCENT Bookcode As 书号, SUM(Amount)As总销量 ROM OrderDetail GROUP BY Bookcode ORDER BY ________
A.Amount DESC
B.SUM(Amount) DESC
C.COUNT(Amount) DESC
D.ADD(Amount) DESC
第4题:
有下列程序: #include<iostream> Using namespace std; Class Amount{ int amount; public; Amount(int n=O):amount(n){} Int getAmount()const{return amount;} Amount &operator+=(AmountA) {
A.*this
B.this
C.&amount
D.amount
第5题:
7、BookStore数据库中有销售明细表OrderDetail(OrderCode, BookCode, Amount) 查询销售总量前20%的图书,并按总销量降序排列。SQL语句: SELECT TOP 20 PERCENT Bookcode As 书号, SUM(Amount)As总销量 ROM OrderDetail GROUP BY Bookcode ORDER BY ________
A.Amount DESC
B.SUM(Amount) DESC
C.COUNT(Amount) DESC
D.ADD(Amount) DESC