初学遇问题，求助各大神

水平低，没办法，求助


#include<alloc.h>
#include<string.h>
  class Blank
  {
  public:
      Blanks(){}
      void *operator new(size_t stAllocateBlock,char chInit);
      };
  void *Blanks::operator new(size_t stAllocateBlock,char chInit)
  {
      void *pvTemp=malloc();
      if(pvTemp!=0)
     memset(pvTemp,chInit,stAllocateBlock);
      return pvTemp;
  }
  int main()
  { Blanks*a5=new(0xa5)Blanks;//创建对象Blanks，并且初试化为0xa5
    return!=0;
  }
错误fatal error C1083: Cannot open include file: 'alloc.h': No such file or directory
执行 cl.exe 时出错.