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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312"> <META NAME="Author" CONTENT="wdg"> <META NAME="GENERATOR" CONTENT="Mozilla/4.03 [en] (Win95; I) [Netscape]"> <TITLE>fb</TITLE></HEAD><BODY> <P>函数名: bar<BR>功 能: 画一个二维条形图<BR>用 法: void far bar(int left, int top, int right, int bottom);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <stdio.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> /* request auto detection */<BR> int gdriver = DETECT, gmode, errorcode;<BR> int midx, midy, i;<P> /* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");<P> /* read result of initialization */<BR> errorcode = graphresult();<BR> if (errorcode != grOk) /* an error occurred */<BR> {<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR> exit(1); /* terminate with an errorcode */<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P> /* loop through the fill patterns */<BR> for (i=SOLID_FILL; i<USER_FILL; i++)<BR> {<BR> /* set the fill style */<BR> setfillstyle(i, getmaxcolor());<P> /* draw the bar */<BR> bar(midx-50, midy-50, midx+50,<BR> midy+50);<P> getch();<BR> }<P> /* clean up */<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: bar3d<BR>功 能: 画一个三维条形图<BR>用 法: void far bar3d(int left, int top, int right, int bottom,<BR> int depth, int topflag);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <stdio.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> /* request auto detection */<BR> int gdriver = DETECT, gmode, errorcode;<BR> int midx, midy, i;<P> /* initialize graphics, local variables */<BR> initgraph(&gdriver, &gmode, "");<P> /* read result of initialization */<BR> errorcode = graphresult();<BR> if (errorcode != grOk) /* an error occurred */<BR> {<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR> exit(1); /* terminate with error code*/<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P> /* loop through the fill patterns */<BR> for (i=EMPTY_FILL; i<USER_FILL; i++)<BR> {<BR> /* set the fill style */<BR> setfillstyle(i, getmaxcolor());<P> /* draw the 3-d bar */<BR> bar3d(midx-50, midy-50, midx+50, midy+50,10, 1);<P> getch();<BR> }<P> /* clean up */<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: bdos<BR>功 能: DOS系统调用<BR>用 法: int bdos(int dosfun, unsigned dosdx, unsigned dosal);<BR>程序例:<P>#include <stdio.h><BR>#include <dos.h><P>/* Get current drive as 'A', 'B', ... */<BR>char current_drive(void)<BR>{<BR> char curdrive;<P> /* Get current disk as 0, 1, ... */<BR> curdrive = bdos(0x19, 0, 0);<BR> return('A' + curdrive);<BR>}<P>int main(void)<BR>{<BR> printf("The current drive is %c:\n", current_drive());<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: bdosptr<BR>功 能: DOS系统调用<BR>用 法: int bdosptr(int dosfun, void *argument, unsigned dosal);<BR>程序例:<P>#include <string.h><BR>#include <stdio.h><BR>#include <dir.h><BR>#include <dos.h><BR>#include <errno.h><BR>#include <stdlib.h><P>#define BUFLEN 80<P>int main(void)<BR>{<BR> char buffer[BUFLEN];<BR> int test;<P> printf("Enter full pathname of a directory\n");<BR> gets(buffer);<P> test = bdosptr(0x3B,buffer,0);<BR> if(test)<BR> {<BR> printf("DOS error message: %d\n", errno);<BR> /* See errno.h for error listings */<BR> exit (1);<BR> }<P> getcwd(buffer, BUFLEN);<BR> printf("The current directory is: %s\n", buffer);<P> return 0;<BR>}<BR> <BR> <BR> <P>函数名: bioscom<BR>功 能: 串行I/O通信<BR>用 法: int bioscom(int cmd, char abyte, int port);<BR>程序例:<P>#include <bios.h><BR>#include <conio.h><P>#define COM1 0<BR>#define DATA_READY 0x100<BR>#define TRUE 1<BR>#define FALSE 0<P>#define SETTINGS ( 0x80 | 0x02 | 0x00 | 0x00)<P>int main(void)<BR>{<BR> int in, out, status, DONE = FALSE;<P> bioscom(0, SETTINGS, COM1);<BR> cprintf("... BIOSCOM [ESC] to exit ...\n");<BR> while (!DONE)<BR> {<BR> status = bioscom(3, 0, COM1);<BR> if (status & DATA_READY)<BR> if ((out = bioscom(2, 0, COM1) & 0x7F) != 0)<BR> putch(out);<BR> if (kbhit())<BR> {<BR> if ((in = getch()) == '\x1B')<BR> DONE = TRUE;<BR> bioscom(1, in, COM1);<BR> }<BR> }<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: biosdisk<BR>功 能: 软硬盘I/O<BR>用 法: int biosdisk(int cmd, int drive, int head, int track,int sector<BR> int nsects, void *buffer);<BR>程序例:<P>#include <bios.h><BR>#include <stdio.h><P>int main(void)<BR>{<BR> int result;<BR> char buffer[512];<P> printf("Testing to see if drive a: is ready\n");<BR> result = biosdisk(4,0,0,0,0,1,buffer);<BR> result &= 0x02;<BR> (result) ? (printf("Drive A: Ready\n")) :<BR> (printf("Drive A: Not Ready\n"));<P> return 0;<BR>}<BR> <BR> <BR> <P>函数名: biosequip<BR>功 能: 检查设备<BR>用 法: int biosequip(void);<BR>程序例:<P>#include <bios.h><BR>#include <stdio.h><P>int main(void)<BR>{<BR> int result;<BR> char buffer[512];<P> printf("Testing to see if drive a: is ready\n");<BR> result = biosdisk(4,0,0,0,0,1,buffer);<BR> result &= 0x02;<BR> (result) ? (printf("Drive A: Ready\n")) :<BR> (printf("Drive A: Not Ready\n"));<P> return 0;<BR>}<BR> <BR> <BR> <P>函数名: bioskey<BR>功 能: 直接使用BIOS服务的键盘接口<BR>用 法: int bioskey(int cmd);<BR>程序例:<P>#include <stdio.h><BR>#include <bios.h><BR>#include <ctype.h><P>#define RIGHT 0x01<BR>#define LEFT 0x02<BR>#define CTRL 0x04<BR>#define ALT 0x08<P>int main(void)<BR>{<BR> int key, modifiers;<P> /* function 1 returns 0 until a key is pressed */<BR> while (bioskey(1) == 0);<P> /* function 0 returns the key that is waiting */<BR> key = bioskey(0);<P> /* use function 2 to determine if shift keys were used*/<BR> modifiers = bioskey(2);<BR> if (modifiers)<BR> {<BR> printf("[");<BR> if (modifiers & RIGHT) printf("RIGHT");<BR> if (modifiers & LEFT) printf("LEFT");<BR> if (modifiers & CTRL) printf("CTRL");<BR> if (modifiers & ALT) printf("ALT");<BR> printf("]");<BR> }<BR> /* print out the character read */<BR> if (isalnum(key & 0xFF))<BR> printf("'%c'\n", key);<BR> else<BR> printf("%#02x\n", key);<BR> return 0;<BR>}<BR> <BR> <P>函数名: biosmemory<BR>功 能: 返回存储块大小<BR>用 法:int biosmemory(void);<BR>程序例:<P>#include <stdio.h><BR>#include <bios.h><P>int main(void)<BR>{<BR> int memory_size;<P> memory_size = biosmemory(); /* returns value up to640K */<BR> printf("RAM size = %dK\n",memory_size);<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: biosprint<BR>功 能: 直接使用BIOS服务的打印机I/O<BR>用 法: int biosprint(int cmd, int byte, int port);<BR>程序例:<P>#include <stdio.h><BR>#include <conio.h><BR>#include <bios.h><P>int main(void)<BR>{<BR> #define STATUS 2 /* printer statuscommand */<BR> #define PORTNUM 0 /* port number forLPT1 */<P> int status, abyte=0;<P> printf("Please turn off your printer. Press any keyto continue\n");<BR> getch();<BR> status = biosprint(STATUS, abyte, PORTNUM);<BR> if (status & 0x01)<BR> printf("Device time out.\n");<BR> if (status & 0x08)<BR> printf("I/O error.\n");<P> if (status & 0x10)<BR> printf("Selected.\n");<BR> if (status & 0x20)<BR> printf("Out of paper.\n");<P> if (status & 0x40)<BR> printf("Acknowledge.\n");<BR> if (status & 0x80)<BR> printf("Not busy.\n");<P> return 0;<BR>}<BR> <BR> <BR> <P>函数名: biostime<BR>功 能: 读取或设置BIOS时间<BR>用 法: long biostime(int cmd, long newtime);<BR>程序例:<P>#include <stdio.h><BR>#include <bios.h><BR>#include <time.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> long bios_time;<P> clrscr();<BR> cprintf("The number of clock ticks since midnight is:\r\n");<BR> cprintf("The number of seconds since midnight is:\r\n");<BR> cprintf("The number of minutes since midnight is:\r\n");<BR> cprintf("The number of hours since midnight is:\r\n");<BR> cprintf("\r\nPress any key to quit:");<BR> while(!kbhit())<BR> {<BR> bios_time = biostime(0, 0L);<P> gotoxy(50, 1);<BR> cprintf("%lu", bios_time);<P> gotoxy(50, 2);<BR> cprintf("%.4f", bios_time / CLK_TCK);<P> gotoxy(50, 3);<BR> cprintf("%.4f", bios_time / CLK_TCK/ 60);<P> gotoxy(50, 4);<BR> cprintf("%.4f", bios_time / CLK_TCK/ 3600);<BR> }<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: brk<BR>功 能: 改变数据段空间分配<BR>用 法: int brk(void *endds);<BR>程序例:<P>#include <stdio.h><BR>#include <alloc.h><P>int main(void)<BR>{<BR> char *ptr;<P> printf("Changing allocation with brk()\n");<BR> ptr = malloc(1);<BR> printf("Before brk() call: %lu bytes free\n", coreleft());<BR> brk(ptr+1000);<BR> printf(" After brk() call: %lu bytes free\n", coreleft());<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: bsearch<BR>功 能: 二分法搜索<BR>用 法: void *bsearch(const void *key, const void *base, size_t*nelem,<BR> size_t width, int(*fcmp)(constvoid *, const *));<BR>程序例:<P>#include <stdlib.h><BR>#include <stdio.h><P>#define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))<P>int numarray[] = {123, 145, 512, 627, 800, 933};<P>int numeric (const int *p1, const int *p2)<BR>{<BR> return(*p1 - *p2);<BR>}<P>int lookup(int key)<BR>{<BR> int *itemptr;<P> /* The cast of (int(*)(const void *,const void*))<BR> is needed to avoid a type mismatch errorat<BR> compile time */<BR> itemptr = bsearch (&key, numarray, NELEMS(numarray),<BR> sizeof(int), (int(*)(const void *,constvoid *))numeric);<BR> return (itemptr != NULL);<BR>}<P>int main(void)<BR>{<BR> if (lookup(512))<BR> printf("512 is in the table.\n");<BR> else<BR> printf("512 isn't in the table.\n");<P> return 0;<BR>}<BR> <P> <A HREF="index.html">返回目录</A><P></BODY></HTML>⌨️ 快捷键说明
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