#include <iostream> using namespace std; class A{ public: A(){cout<<" ";} ～A(){cout<<" ";} } class B:public A{ public: B(){cout<<" ";} ～B(){cout<<" ";} } void main(){ B b; } A.1234B.1324C.1342D.3142 答案 C[解析] 构造函数和析构函数系统可以自动调用。先...
有以下程序: # include using namespace std; class Base { private: void funl()const{ cout <<"funl";} protected: void fun2()const{ cout <<"fun2";} public: void fun3()const{ cout <<"fun3";} }; class Derived : protected Base public: void fun4()const{ cout <<"fun4";} }; ...
using namespace 命名空间; 该用法能直接在程序中使用using后所跟的命名空间的元素,而不用每次要使用时指定命名空间。 using namespace std;//这样就可以直接用std命名空间里的元素了,如cout,string等,否则要指定命名空间,std::cout,std::string等。 1. 用法二: 给某一类型定义别名,和typedef作用一样。 using ...
coder777, I'm learning OOP, and I'm thinking that when we use "using namespace std" we say to compiler that we will work in "OOP mode"? ty. Feb 1, 2012 at 11:46pm closed account (1vRz3TCk) co1otewrote: #include <iostream.h>// with ".h"will say that it is deprecated ...
有以下程序 #include using namespace std; class Complex //复数类 { public: Complex(double r=0,double i=0):re(r),im(i){} double real() const { return re; } double imag() const { return im; } Complex operator+(Complex c)const { return Complex(re+c.re,im+c.im); } private: ...
using namespace std; class invoice{ public: ___{ cout《 "This is the content of the invoice!"《 endl; } }; class Decorator : public invoice { Invoice *ticket; public: Decorator(lnvoice *t) { ticket = t; } void printinvoice(){ if(ticket != NULL) ___ } }; class HeadDecorator ...
下面程序的功能是统计用0至9之间的不同的数字组成的三位数的个数。#include using namespace std;void main(){int i,j,k,co
{"October"31},{"November"30}这两个括号里都少了逗号...这种错误在编程的时候一定要注意了，尽量少犯呢，会很浪费时间的。把
有如下程序: #include using namespace std; class sample { private: intx,y; public: smnple(int i,int j) { x=i: y=j; } void disp( ) { cout<<’’disp1’’<A.disp1B.disp2C.disp1 disp2D.程序编译时出错的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)
下面代码运行结果是 。using namespace std; #include <iostream> int t(void){ static int i = 1; i += 2; return i; } int t1(void){ int j =1; j += 2; return j; } int main(){ int j=2; t(); cout << "I="<<t( )<<" "; t1(); cout << "J="<<t1( )<< '\n'...