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C/C++/VC MFC char & int study

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#include <stdio.h>
void main()
{
 int aa;
 unsigned char j1,j2;
 aa=j1=j2=0;
 aa=49;
 j1=aa;
 printf("j1=%d \n",j1);
 j2=aa;
 printf("j2=%c \n",j2);
}
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    j1=49
    j2=1
    Press any key to continue
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[3]j1 ,j2ͬΪunsigned charÐÍÊý¾Ý£»
[4]ÉÏÊö¶þ±äÁ¿Êä³ö½á¹û²»Ò»Ö£»ÓÉprinf£¨£©º¯ÊýÖеĸñʽ·û²»Í¬ËùÖ£»
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[6]¶ÔÓÚÒÔÉÏ·ÖÎöµÄÀí½â£ºÏÔÈ»£¬printf()º¯Êý½«»áÒÀÕÕÓû§Ìṩ¸øËüµÄ ¸ñʽ·û ¶Ô´ýÊä³öµÄÊý¾Ý½øÐÐ
   “´¦À픺ó£¬Êä³öÖÁÏÔʾÉ豸ÉÏ¡£
[7]……
²âÊÔ´úÂë¶þ(VC6.0 ,VC mfc)£º
 int aa,bb;
 aa=bb=0;
 
 CString strtemp,display;
 strtemp.Format("%c",170); //170==0xAA
 MessageBox(strtemp);
 int length=strtemp.GetLength();
 for(int i=0;i<length;i++)
 {
      aa+=strtemp.GetAt(i);
      bb+=(unsigned char)strtemp.GetAt(i);
 }
 display.Format("(TCHAR)aa=%x",aa);
 MessageBox(display);
 display.Format("(unsigned char)bb=%x",bb);
 MessageBox(display);
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    MessageBox(strtemp);===== "?"
 
   display.Format("(TCHAR)aa=%x",aa);
   MessageBox(display);====="(TCHAR)aa=ffffffaa"  //(ff ff ff aa)
  
   display.Format("(unsigned char)bb=%x",bb);
   MessageBox(display);====="("(unsigned char)bb=aa"
[2] // return single character at zero-based index
    TCHAR GetAt(int nIndex) const;
    <À´Ô´£ºCString-class£»×îÖÕ½âÊÍΪmicrosoft VC6.0>
[3]typedef char TCHAR, *PT


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