third class 函数

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//default.cpp//default parameter:缺省（默认）参数#inclide<iostream>using namespace std;int max(int a[],int n=2)//n=2 默认数组元素个数{int t=a[0];for(int i=1;i<n;i++)t=(a[i]>t)?a[i]:t;return t;}//dynamically allocating memory 动态定义数组//int main()//{//int *a=NULL,n;//cout<<"How many students:";//cin>>n;//a = new int[n];//int *b=NULL;//b = new int(6);//分配的这个内存中存储的数为6//cout<<"Max = "//<<max(a,n)//<<endl;delete b;//单个直接回收，delete回收delete []a;//数组回收，//return 0;////}int main(){int a[]={5,4,2,10,3,6,8,9,0};cout<<"Max = "<<max(a,sizeof(a)/sizeof(int))<<endl;return 0;}

//function templatetemplate<class T>//函数模板T max(T a,T b){return(a>b)?a:b; }template<class T>void swap(T&a, T&b){T t=a;a=b;b=t;}template<class T>bool equal(T a,T b){return a == b;}template<>bool equal(char*a,char*b)//specialization 特化{return strcmp(a,b)==0;}int max(int a[],int n){int t=a[0];for(int i=1;i<n;i++)t=max(t,a[i]);//instantiation(模板实例化) //int max(int,int){...}}template<class T, int C>void ff(T x){T *a;a= new T[C];a[0] = x;return;}

#include<iostream>#include<string>using std::count;using std::string;//using namespace std;namespace MyNames2{double max(double a[],int n);return(-1);};namespace MyNames2{const int max = 10086;};using MyNames::max;int main(){double f[10]={0.0};cout<<"hello;world!"<<endl;cout<<max(f,10)<<endl;return 0;}for(int i=0;i<10;i++)cin>>f[i];//int x = 10;int&rx = x;rx++;int* px = &x;(*px)++;//x加了两次

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