回复：码客：程序员帮忙解答各种问题，每天十个问题！！！！

#include <iostream>
#include <utility>
#include <vector>
#include <string>
#include <iterator>
#include <algorithm>
#include <numeric>
using namespace std;
int main()
{
istream_iterator<int> aa(cin),ab;
vector<int> ac(aa,ab);
sort(ac.rbegin(),ac.rend());
ostream_iterator<int> ad(cout," ");
unique_copy(ac.begin(),ac.end(),ad);
return 0;
}
请教楼主,最近学c++流迭代器,对这段例子里面的运行顺序有疑惑,为什么unique_copy(ac.begin(),ac.end(),ad);会在ostream_iterator<int> ad(cout," "); 输出之前被执行到呢?

假定iv是一个int的vector，下面的程序存在什么错误？该如何修改？
vector<int>::iterator iter=iv.begin(),mid=iv.begin()+iv.size()/2;
while(iter!=mid)
if(*iter==some_val)
iv.insert(iter,some_val*2);
个人解题：
vector<int> iv{ 0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,3,4,5,6,7,8,9 };
vector<int>::iterator iter = iv.begin(), mid = iv.begin()+iv.size ()/ 2;
static int n = 0;
while (iter != mid)
if (*iter == 1)
n++,iter = iv.insert(iter, 2 * 1), iter += 2,mid=iv.begin()+n+(iv.size()-n)/2;
else
iter++;
请问有没有简单方便点的办法？

请问，咳，我觉得，我想不出来贪吃蛇是怎么写的。我是不是应该看看别人的代码怎么写，还是我应该写一些很简单的程序呢？

#include<iostream.h>
#include<string>
using namespace std;
class Toy
{
private:
string Namenew;
int Priacenew;
int Numbernew;
int total;
public:
Toy(string name,int priace,int number)
{
Namenew=name;
Priacenew=priace;
Numbernew=number;
}
~Toy (){}
string GetName(){return Namenew;}
int GetPriace(){return Priacenew;}
int GetNumber(){return Numbernew;}
void SetName(string name){Namenew=name;}
void SetPriace(double priace){Priacenew=priace;}
void SetNumber(int number){Numbernew=number;}
int Total();
void print();
};
int Toy::Total()
{
total=Priacenew*Numbernew;
return (total);
}
void Toy::print()
{
cout<<"名称="<<Namenew<<"单价="<<Priacenew<<",售出数量="<<Numbernew<<",总售出金额="<<total<<endl;
}
int main()
{
Toy toy[3]{Toy("dog",20,3),
Toy("car",50,6),
Toy("bear",70,4)};
for(int i=0;i<3;i++)
{
toy[i].print();
}
return 0;
}
--------------------Configuration: 2 - Win32 Debug--------------------
Compiling...
2.cpp
D:\Program Files\Microsoft Visual Studio\MyProjects\2\2.cpp(39) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or t
here is no acceptable conversion)
D:\Program Files\Microsoft Visual Studio\MyProjects\2\2.cpp(44) : error C2601: 'toy' : local function definitions are illegal
D:\Program Files\Microsoft Visual Studio\MyProjects\2\2.cpp(44) : error C2063: 'toy' : not a function
执行 cl.exe 时出错.
2.obj - 1 error(s), 0 warning(s)
求解答哪里有问题 ，怎么修改，新手不太懂，谢谢大神

6666666

程序猿好找女朋友吗

求解：求一个自然数前的素数个数

能帮我看看哪里有问题么？？求求了
#include<iostream.h>
#include<string>
using namespace std;
class Toy
{
private:
string Name;
int Price;
int Number;
int total;
public:
Toy(){}
Toy(string n,int p,int num)
{
Name=n;
Price=p;
Number=num;
}
~Toy (){}
string GetName(){return Name;}
int GetPrice(){return Price;}
int GetNumber(){return Number;}
void SetName(string n){Name=n;}
void SetPrice(double p){Price=p;}
void SetNumber(int num){Number=num;}
int Total();
void print();
};
int Toy::Total()
{
return (Price*Number);
}
void print(Toy *tToy)
{
for(int i=0;i<3;i++)
{cout<<"名称="<<tToy[i].GetName()<<"/t"
<<"单价="<<tToy[i].GetPrice()<<"/t"
<<"售出数量="<<tToy[i].GetNumber<<"/t"
<<"总价="<<tToy[i].Total<<endl;
}
}
int main()
{
Toy tToy[3]{Toy("dog",20,3),
Toy("car",50,6),
Toy("bear",70,4)};
print(tToy);
return 0;
}
--------------------Configuration: 2 - Win32 Debug--------------------
Compiling...
2.cpp
D:\Program Files\Microsoft Visual Studio\MyProjects\2\2.cpp(40) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or t
here is no acceptable conversion)
D:\Program Files\Microsoft Visual Studio\MyProjects\2\2.cpp(49) : error C2601: 'tToy' : local function definitions are illegal
D:\Program Files\Microsoft Visual Studio\MyProjects\2\2.cpp(49) : error C2063: 'tToy' : not a function
执行 cl.exe 时出错.
2.obj - 1 error(s), 0 warning(s)

string b=“36 38 39 80 47 52 nil nil nil 25 3666 254 586 5 69” 如何按空格来分割，讲分割后的值放进vector容器里， 怎么解决，求帮看看