回答一:
conio.h不是C标准库中的头文件。 conio是Console Input/Output(控制台输入输出)的简写,其中定义了通过控制台进行数据输入和数据输出的函数,主要是一些用户通过按键盘产生的对应操作,比如getch()函数等等。
包含的函数:
cgets(char *);
cprintf(const char *, ...);
cputs(const char *);
cscanf(const char *, ...);
inp(unsigned short); inpw(unsigned short);
getch(void); getche(void); kbhit(void);
outp(unsigned short, int); outpw(unsigned short, unsigned short);
putch(int);
ungetch(int);
void _Cdecl clreol (void);
void _Cdecl clrscr (void);
void _Cdecl delline (void);
int _Cdecl gettext (int left, int top, int right, int bottom, void *destin); void _Cdecl gettextinfo (struct text_info *r);
void _Cdecl gotoxy (int x, int y);
void _Cdecl highvideo (void); void _Cdecl insline (void);
void _Cdecl lowvideo (void);
int _Cdecl movetext (int left, int top, int right, int bottom, int destleft, int desttop);
void _Cdecl normvideo (void);
int _Cdecl puttext (int left, int top, int right, int bottom, void *source);
void _Cdecl textattr (int newattr);
void _Cdecl textbackground (int newcolor);
void _Cdecl textcolor (int newcolor);
void _Cdecl textmode (int newmode);
int _Cdecl wherex (void);
int _Cdecl wherey (void);
void _Cdecl window (int left, int top, int right, int bottom);
char *_Cdecl cgets (char *str);
int _Cdecl cprintf (const char *format, ...);
int _Cdecl cputs (const char *str);
int _Cdecl cscanf (const char *format, ...);
int _Cdecl getch (void);
int _Cdecl getche (void);
char *_Cdecl getpass (const char *prompt);
int _Cdecl kbhit (void);
int _Cdecl putch (int c);
int _Cdecl ungetch (int ch);
回答二:while(*t)是指循环永远成立