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c变量

//原型：char *strcpy(char *strDst, const char *strSrc)

#include <iostream>
#include <assert.h>
using namespace std;
char *StrCpy(char *strDst,const char * strSrc)
{
 assert((strDst!=NULL)&&(strSrc!=NULL));
 char *addr = strDst;
 while ((*strDst++=*strSrc++)!= '\0') NULL;
 return addr;
}

//注意：char转换为int型是把char转换为对应的ASCII码

#include <iostream>
using namespace std;
int CharToInt(const char *str)
{
 int iVal = *str++-'0';
 while (*str!='\0')
 {
  iVal = iVal*10 +(*str++-'0');
 }
 return iVal;
}
void main()
{
 char *str ='12345';
 cout<<'str: '<<str<<endl;
 int i = 0;
 i = CharToInt(str);
 cout<<'  Int: '<<i<<endl;
}

1.

使用C编译器，可以这样指定： #define _STDC_

使用C++编译器，             #define _cplusplus

2.

出错提示：The program '[3084] CountSize.exe: Native' has exited with code 0 (0x0).

解决： this is normal.it is stand for the program is exiting normaly.

  method1: run the program with CTRL+F5, rather than only F5;

  method2: add the sentence: system('pause'); at the end of the program.

  method3: add the sentences: | printf('press any key to continue....');

                              | _getch();

3. 字节对齐

   长度为取其最长字节的整数倍，

   按最小字节对齐