功 能: 将程序的执行暂停一段时间(毫秒)

　　用 法: void delay(unsigned milliseconds);

　　程序例:

　　/* Emits a 440-Hz tone for 500 milliseconds */
#include
int main(void)
{
sound(440);
delay(500);
nosound();
return 0;
}

　　函数名: delline

　　功 能: 在文本窗口中删去一行

　　用 法: void delline(void);

　　程序例:

　　#include
int main(void)
{
clrscr();
cprintf("The function DELLINE deletes \
the line containing the\r\n");
cprintf("cursor and moves all lines \
below it one line up.\r\n");
cprintf("DELLINE operates within the \
currently active text\r\n");
cprintf("window. Press any key to \
continue . . .");
gotoxy(1,2); /* Move the cursor to the
second line and first column */
getch();
delline();
getch();
return 0;
}

　　函数名: detectgraph

　　功 能: 通过检测硬件确定图形驱动程序和模式

　　用 法: void far detectgraph(int far *graphdriver, int far *graphmode);

　　程序例:

　　#include
#include
#include
#include
/* names of the various cards supported */
char *dname[] = { "requests detection",
"a CGA",
"an MCGA",
"an EGA",
"a 64K EGA",
"a monochrome EGA",
"an IBM 8514",
"a Hercules monochrome",
"an AT&T 6300 PC",
"a VGA",
"an IBM 3270 PC"
};
int main(void)
{
/* returns detected hardware info. */
int gdriver, gmode, errorcode;
/* detect graphics hardware available */
detectgraph(&gdriver, &gmode);
/* read result of detectgraph call */
errorcode = graphresult();
if (errorcode != grOk) /* an error
occurred */
{
printf("Graphics error: %s\n", \
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error
code */
}
/* display the information detected */
clrscr();
printf("You have %s video display \
card.\n", dname[gdriver]);
printf("Press any key to halt:");
getch();
return 0;
}