C语言库函数(K类字母)

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核心提示：函数名: kbhit功能: 检查当前按下的键用法: int kbhit(void);程序例: #include <conio.h> int main(void){ cPRintf("Press any key to continue:"); while (!kbhit()) /* do

　
函数名: kbhit
功　能: 检查当前按下的键
用　法: int kbhit(void);
程序例:
#include <conio.h>

int main(void)
{
　 cPRintf("Press any key to continue:");
　 while (!kbhit()) /* do nothing */ ;
　 cprintf("\r\nA key was pressed...\r\n");
　 return 0;
}

　

函数名: keep
功　能: 退出并继续驻留
用　法: void keep(int status, int size);
程序例:

/***NOTE:
　 This is an interrupt service routine.　You
　 can NOT compile this program with Test
　 Stack Overflow turned on and get an
　 executable file which will Operate
　 correctly.　Due to the nature of this
　 function the formula used to compute
　 the number of paragraphs may not
　 necessarily work in all cases.　Use with
　 care!　Terminate Stay Resident (TSR)
　 programs are complex and no other support
　 for them is provided.　Refer to the
　 MS-DOS technical documentation
　 for more information.　*/
#include <dos.h>
/* The clock tick interrupt */
#define INTR 0x1C
/* Screen attribute (blue on grey) */
#define ATTR 0x7900

/* redUCe heaplength and stacklength
to make a smaller program in memory */
extern unsigned _heaplen = 1024;
extern unsigned _stklen　= 512;

void interrupt ( *oldhandler)(void);

void interrupt handler(void)
{
　 unsigned int (far *screen)[80];
　 static int count;

/* For a color screen the video memory
　 is at B800:0000.　For a monoChrome

　 system use B000:000 */
　 screen = MK_FP(0xB800,0);

/* increase the counter and keep it
　 within 0 to 9 */
　 count++;
　 count %= 10;

/* put the number on the screen */
　 screen[0][79] = count + '0' + ATTR;

/* call the old interrupt handler */
　 oldhandler();
}

int main(void)
{

/* get the address of the current clock
　 tick interrupt */
oldhandler = getvect(INTR);

/* install the new interrupt handler */
setvect(INTR, handler);

/* _psp is the starting address of the
　 program in memory.　The top of the stack
　 is the end of the program.　Using _SS and
　 _SP together we can get the end of the
　 stack.　You may want to allow a bit of
　 saftey space to insure that enough room
　 is being allocated ie:
　 (_SS + ((_SP + safety space)/16) - _psp)
*/
keep(0, (_SS + (_SP/16) - _psp));
return 0;
}