C++

有点郁闷，就看看了C|++看的更闷。// XStudy.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <stdlib.h>#include <stdio.h>#include <malloc.h>#include <memory.h>struct CacheData{    char*   cacheItemKey;    char*   cacheItem;    int    size;}  CP[16],*All;typedef struct _myinfo_detail{    long    Number;    char    Type[256];} MyInfoDetail, * LPMyInfoDetail;typedef struct _myinfo{    long Count;    LPMyInfoDetail  MyList;} MyInfo, * LPMyInfo;int stringLenght(const char* itemP){    int ic=0;    while( (*(itemP++))!='/0')        ic++;    return ic;};void pointerTest(){    //内存分配与回收    char*  cacheItem={"wwwStudyezCom" };    char*  itemData={"this is a Time To Send4You Test !"};         int size= stringLenght(cacheItem);    printf("%d/r/n",size);    size=sizeof(CP);    printf("%d/n",size );    printf("%s/r/n",cacheItem);    for(int i=0;i<16;i++){            CP[i].cacheItem = "juust a test " ;        CP[i].cacheItemKey ="dasfa";        CP[i].size =stringLenght(CP[i].cacheItemKey);         printf("%d/n",CP[i].size );    }    char buffer[50];    double source = -3.1415;    _gcvt_s(buffer,25,source,20);    printf("缓冲区的长度:%d/n",sizeof(buffer));    printf( "source: %f buffer: '%s'/n", source, buffer );    printf("ALL1:%d/n",sizeof(All));    All=CP;    printf("ALL2:%d/n",sizeof(All));    int len=sizeof(CP)/sizeof(CacheData);    printf("SP:%d/n",len);    int ip=0;    while(ip<len){        printf("%d: %s/n",ip ,( *All++).cacheItem);        printf("%d: %s/n",ip,( CP+ip)->cacheItemKey);        ip++;         }}void allocTest(){    MyInfo myinfo;    int size=sizeof(MyInfoDetail)*10;    myinfo.MyList =(LPMyInfoDetail)malloc(size);       myinfo.Count=10;    for(int i=0;i<myinfo.Count;i++)    {        myinfo.MyList[i].Number=i;    }    printf("Hello World!/n");} //第一中用法  一样int const iAge=4;const int  iPage=4;//意义同上 int age=10;  //指针常量 int const *iPint=&iAge; //Right: &iPage;//常量指针，int * const iC= &age;// Error: int * const iC=&iAge;const int *iP;//函数指针void (*pFun)();typedef  void  (*Callback)();int _tmain(int argc, _TCHAR* argv[]){        // iAge=5; error:C3892     //iPage=4;    iPint=&age;//Error::*iPint=10; (*iPint是常量)    *iC=20;    printf("%d",iAge);    iP=&age;    /*    *iP=age;    */    //函数指针    pFun  =&allocTest;    pFun();        Callback cb=&pointerTest;    cb();       return 0;}