请教STL中for_each的使用

[namtaerg]

代码如下：
#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
// STL函数for_each()
using namespace std;
struct Book{
string title;
int price;
};
void showBook(Book &b){
cout << b.title << b.price << endl;
};

int main()
{
Book books[]={{"C Primer Plus",45}, {"C++ Primer Plus",54}};
vector<Book> mybooks;
for (int i=0; i < sizeof(books)/sizeof(Book); i++)
{
mybooks.push_back(books[i]);
};
for_each(mybooks.begin(), mybooks.end(), showBook);// 使用STL函数for_each()
return 0;
}

可编译后出现如下错误提示：

1>LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library
1>main.obj : error LNK2019: unresolved external symbol __CrtDbgReportW referenced in function "public: __thiscall std::_Vector_const_iterator<struct Book,class std::allocator<struct Book> >::_Vector_const_iterator<struct Book,class std::allocator<struct Book> >(struct Book *,class std::_Container_base const *)" (??0?$_Vector_const_iterator@UBook@@V?$allocator@UBook@@@std@@@std@@QAE@PAUBook@@PBV_Container_base@1@@Z)
1>libcpmtd.lib(cout.obj) : error LNK2001: unresolved external symbol __CrtDbgReportW
1>libcpmtd.lib(stdthrow.obj) : error LNK2001: unresolved external symbol __CrtDbgReportW
1>libcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol __CrtDbgReportW
1>libcpmtd.lib(xdebug.obj) : error LNK2019: unresolved external symbol __malloc_dbg referenced in function "void * __cdecl operator new(unsigned int,struct std::_DebugHeapTag_t const &,char *,int)" (??2@YAPAXIABU_DebugHeapTag_t@std@@PADH@Z)
1>libcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol __malloc_dbg
1>libcpmtd.lib(xdebug.obj) : error LNK2019: unresolved external symbol __free_dbg referenced in function "void __cdecl operator delete(void *,struct std::_DebugHeapTag_t const &,char *,int)" (??3@YAXPAXABU_DebugHeapTag_t@std@@PADH@Z)
1>libcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol __free_dbg
1>libcpmtd.lib(_tolower.obj) : error LNK2019: unresolved external symbol __calloc_dbg referenced in function __Getctype
1>.\Debug/Chapter21_1.exe : fatal error LNK1120: 4 unresolved externals


请问大家，如何解决编译问题？或者说，如何使用for_each()?

[pengzhixi]

DEV-CPP XP下编译运行都没问题

[herry-Li]

楼主用的VC6.0？vs2008下没问题

[clhposs]

#include <vector>
#include <algorithm>
#include <iostream>

// The function object multiplies an element by a Factor
template <class Type>
class MultValue
{
private:
   Type Factor;   // The value to multiply by
public:
   // Constructor initializes the value to multiply by
   MultValue ( const Type& _Val ) : Factor ( _Val ) {
   }

   // The function call for the element to be multiplied
   void operator ( ) ( Type& elem ) const
   {
      elem *= Factor;
   }
};

// The function object to determine the average
class Average
{
private:
   long num;      // The number of elements
   long sum;      // The sum of the elements
public:
   // Constructor initializes the value to multiply by
   Average ( ) : num ( 0 ) , sum ( 0 )
   {
   }

   // The function call to process the next elment
   void operator ( ) ( int elem ) \
   {
      num++;      // Increment the element count
      sum += elem;   // Add the value to the partial sum
   }

   // return Average
   operator double ( )
   {
      return  static_cast <double> (sum) /
      static_cast <double> (num);
   }
};

int main( )
{
   using namespace std;
   vector <int> v1;
   vector <int>::iterator Iter1;

   // Constructing vector v1
   int i;
   for ( i = -4 ; i <= 2 ; i++ )
   {
      v1.push_back(  i );
   }

   cout << "Original vector  v1 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   // Using for_each to multiply each element by a Factor
   for_each ( v1.begin ( ) , v1.end ( ) , MultValue<int> ( -2 ) );

   cout << "Multiplying the elements of the vector v1\n "
        <<  "by the factor -2 gives:\n v1mod1 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   // The function object is templatized and so can be
   // used again on the elements with a different Factor
   for_each (v1.begin ( ) , v1.end ( ) , MultValue<int> (5 ) );

   cout << "Multiplying the elements of the vector v1mod\n "
        <<  "by the factor 5 gives:\n v1mod2 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   // The local state of a function object can accumulate
   // information about a sequence of actions that the
   // return value can make available, here the Average
   double avemod2 = for_each ( v1.begin ( ) , v1.end ( ) ,
      Average ( ) );
   cout << "The average of the elements of v1 is:\n Average ( v1mod2 ) = "
        << avemod2 << "." << endl;
}

[namtaerg]

[Quote=引用 2 楼 lijiepub 的回复:]
楼主用的VC6.0？vs2008下没问题
[/Quote]

俺用的是VS2005

[herry-Li]

[Quote=引用 4 楼 namtaerg 的回复:]
引用 2 楼 lijiepub 的回复:
楼主用的VC6.0？vs2008下没问题


俺用的是VS2005
[/Quote]


我肯定是你的编译器问题

[pengzhixi]

加上include "stdafx.h"

[namtaerg]

从编译错误提示来看，感觉是缺少了某个库，但就是不知道啊~~~~

VS2005为啥就不能编译通过呢？

[herry-Li]

[Quote=引用 6 楼 pengzhixi 的回复:]
加上include "stdafx.h"
[/Quote]

此仁兄所言极是

[namtaerg]

原先建立Win32 Console时没有放预编译，特别是你所说的#include "stdafx.h"。
现在重新创一个了一个待预编的，就好了。

呵呵，谢谢大家。

[Quote=引用 6 楼 pengzhixi 的回复:]
加上include "stdafx.h"
[/Quote]