Basically, it is needed for many different uses, the simplest of which are cout and endl. Let's have an example. #include <iostream> using namespace std; int main(){ cout << "Hello World" << endl; return 0; } //Hello World So far, so good. Simple, you might say. Now, ...
I wanted to know the use namespace from day 1. I thought why do we write "using namespace std;". I got the answer that it is so because we in c++ 11th standard, cout is
using namespace std; class A {}; class A2 {char d,e;}; struct B{}; struct C{ char x,y;}; struct D{int x,y;}; main() { cout< cout< A. *p1=new A(); B. p2; 相关知识点: 试题来源: 解析 对于一个类而言,即便它是一个空的类,编译器仍然要要给它一个空间,所以类A即便什么...
what is the output the following code?#include using namespace std;class A1 { public: int a; static int b;A1(); ~A1();}; 4class A2 { public: int a; char c; A2(); ~A2();}; 8class A3 { public: float a; char c; A3(); ~A3();}; 8class A4 { public: float a; int...
This interview question come from a famous communication firm of china. : ) 1 #include 2 #include 3 #include 4 #include 5 using namespace std; 6 ...
usingnamespacestd; template<typenameTP> structCOne {// default member is public typedefTP one_value_type; }; template<typenameCOne>// 用一个模板类作为模板参数, 这是很常见的 structCTwo { // 请注意以下两行 // typedef COne::one_value_type two_value_type; // *1 ...
* //HalSetSystemInformation#include <iostream>#include <string.h>#include <Windows.h>using namespace std;#define IOCTL(Function) CTL_CODE(FILE_DEVICE_UNKNOWN, Function, METHOD_NEITHER, FILE_ANY_ACCESS)#define HEVD_IOCTL_ARBITRARY_WRITE IOCTL(0x802)typedef struct SYSTEM_MODULE { ULONG Reserved...
world [root@iZuf62soquu9rssso122mlZ test]# cat test1.cpp #include<iostream> #include<stdexcept> using namespace std; char *strcpy(char* dest, const char *src){ if(dest==src) return dest; if((dest==NULL)||(src==NULL)) return NULL; ...
thank you. Any help is great otherwise just don't. Here is the code: #include <iostream>; #include <cmath>; using namespace std; int main() { long double a, b, c, A, A1, B1, B, tot1, tot2, tot3; char done, an;
using namespace std; struct node { char c; int x; }h[6]; bool cmp(node a,node b) { return a.x>b.x; } int main() { int n,m; scanf("%d%d",&n,&m); while (n!=0 && m!=0) { char ch[100]; for (int i=1;i<=5;i++) h[i].x=0; ...