public static const int A=1;这段代码有错误么?是什么?
public static const int A=1;这段代码有错误么?是什么?
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下面这段代码有错误么?switch (i){case():CaseZero();break;case 1:CaseOne();break;case 2:dufault;CaseTwo();break;}
Eclipse JDT 代码生成修饰符丢失问题? Iusejdt(Ver=3.6.2.v_A76_R36x,API=JSL3)togenerateamembermethodorfieldIfindtheoutputmethodhasnomodifiers.setModifier(int)is@Deprecated,SoIusesetFlag(int)method.ItriedparameterModifier.PUBLIC,Modifier.ModifierKeyword.PUBLIC_KEYWORD.toFlagValue(),neitherworks.Code:MethodDeclarationmd=ast.newMethodDeclaration();md.setFlags(Modifier.ModifierKeyword.PUBLIC_KEYWORD.toFlagValue());md.setReturnType2(ast.newPrimitiveType(PrimitiveType.VOID));//md.setFlags(Modifier.PUBLIC|Modifier.STATIC);md.setName(ast.newSimpleName("onCreate"));Output:voidonCreate(...Question:Wherepublickeywordgone?howtoaddmodifier?why?oraBug?
下面这段代码有错误么?switch (i){case(): 答://case()条件不能为空CaseZero();break;case 1:CaseOne();break;case 2:dufault;
有以下程序:includeusing namespace std;class Complex{public:Complex(dOuble r=0,d 有以下程序: #include<iostream> using namespace std; class Complex { public: Complex(dOuble r=0,dOuble i=0):re(r),im(i){} doublereal()const{return re;} doubleimag()const{return im;} Complex operator+(Complex c)const {return ComplexA.6+6iB.6+1iC.1+6iD.1+1i
有下列程序:includeusing namespace std;class VAC{public: int f() const{return3;} 有下列程序: #include<iostream> using namespace std; class VAC{ public: int f() const{return3;} int f() {return 5;} }; int main(){ VAC v1; const VAC v2; cout<<v1.f()<<v2.f();A.53B.35C.55D.33
阅读以下说明和Java程序,填写程序中的空(1)~(6),将解答写入答题纸的对应栏内。【说明】以下Java代码实现一个简单绘图工具,绘制不同形状以及不同颜色的图形。部分接口、类及其关系如图5-1所示。【Java代码】interface?DrawCircle?{? //绘制圆形 public(1) ;}class?RedCircle?implements?DrawCircle?{? ?//绘制红色圆形???????public?void?drawCircle(int?radius,intx,?int?y)??{????????????System.out.println("Drawing?Circle[red,radius:"?+?radius?+",x:"?+?x?+?",y:"?+y+?"]");???????}}class?GreenCircle?implements?DrawCircle?{????//绘制绿色圆形??????public?void?drawCircle(int?radius,?int?x,int?y)?{???????????System.out.println("Drawing?Circle[green,radius:"?+radius+",x:?"?+x+?",y:?"?+y+?"]");??????}}abstract?class?Shape?{????//形状? protected? ? (2)???;? ? public?Shape(DrawCircle?drawCircle)?{? ?this.drawCircle=?drawCircle;? ? ? public?abstract?void?draw();}class?Circle?extends?Shape?{? //圆形? ?private?int?x,y,radius;? public?Circle(int?x,int?y,intradius,DrawCircle?drawCircle)?{? ?(3)???;? this.x?=?x;? ? ? this.y?=?y;? ?this.radius?=radius;? }? ? ?public?void?draw()?{? ? drawCircle.? ?(4)? ?;? ? ? }}public?class?DrawCircleMain?{? public?static?void?main(String[]?args)?{? Shape?redCircle=new?Circle(?100,100,10,? (5) );//绘制红色圆形? Shape?greenCircle=new?Circle(200,200,10,(6) );//绘制绿色圆形? ?redCircle.draw(); greenCircle.draw();? ?}}
阅读下列说明和C++代码,填写程序中的空(1)~(6),将解答写入答题纸的对应栏内。【说明】以下C++代码实现一个简单绘图工具,绘制不同形状以及不同颜色的图形。部分类及其关系如图6-1所示。【C++代码】#include?#include?using?namespace?std;class?DrawCircle?{??????//绘制圆形,抽象类? ? ? public: (1);//定义参数为?int?radius,?int?x,?inty? ?virtual~DrawCircle()?{?}};class?RedCircle:public?DrawCircle?{????//绘制红色圆形? ? ? ? public: void?drawCircle(intradius,?int?x,?int?y)?{cout??drawCircle?=?drawCircle;? }? ?virtual~shape()?{?}? public:? ?virtual?void?draw()?=?0;};class?Circle:public?Shape?{????//圆形? ? private:? ? ?int?x,y,radius;? ? public:? Circle(int?x,inty,int?radius,DrawCircle?*drawCircle)? (3)? {? this->x?=?x;? ?this->y?=?y;? ? this->radius?=?radius; }? ? ? public:? void?draw(){? drawCircle?-> (4); }};int?main(){Shape?*redCirclenew?Circle(100,100,10,????(5)????);//绘制红色圆形? Shape?*greenCircle=new?Circle(100,100,10, (6)??);//绘制绿色圆形redCircle >draw();? ?greenCircle?->draw();? ?return?0;}
若有以下类W说明,则函数fConst的正确定义是()。 class W { int a; public: void fConst(int ) const; };A.void W::fConst(int k ) const { k = a; }B.void W::fConst(int k ) const { k = a++; }C.void W::fConst(int k ) const { cin>> a; }D.void W::fConst(int k ) const { a = k; }
如下代码中,类 X 的拷贝构造函数的数量是 class X { public: X(); X(int); X(const X, int = 1); ~X(); };