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C语言库函数 (B类字母)

2008-06-01 02:08:27 编辑來源:互联网 国际版 评论
 
 
  [ 发表日期:2002-1-4 9:28:46 ]

  函数名: bar

  功 能: 画一个二维条形图

  用 法: void far bar(int left, int top, int right, int bottom);

  程序例:

  #include <graphics.h>

  #include <stdlib.h>

  #include <stdio.h>

  #include <conio.h>

  int main(void)

  {

  /* request auto detection */

  int gdriver = DETECT, gmode, errorcode;

  int midx, midy, i;

  /* initialize graphics and local variables */

  initgraph(&gdriver, &gmode, "");

  /* read result of initialization */

  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 */

  }

  midx = getmaxx() / 2;

  midy = getmaxy() / 2;

  /* loop through the fill patterns */

  for (i=SOLID_FILL; i<USER_FILL; i++)

  {

  /* set the fill style */

  setfillstyle(i, getmaxcolor());

  /* draw the bar */

  bar(midx-50, midy-50, midx+50,

  midy+50);

  getch();

  }

  /* clean up */

  closegraph();

  return 0;

  }

  函数名: bar3d

  功 能: 画一个三维条形图

  用 法: void far bar3d(int left, int top, int right, int bottom,

  int depth, int topflag);

  程序例:

  #include <graphics.h>

  #include <stdlib.h>

  #include <stdio.h>

  #include <conio.h>

  int main(void)

  {

  /* request auto detection */

  int gdriver = DETECT, gmode, errorcode;

  int midx, midy, i;

  /* initialize graphics, local variables */

  initgraph(&gdriver, &gmode, "");

  /* read result of initialization */

  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 error code */

  }

  midx = getmaxx() / 2;

  midy = getmaxy() / 2;

  /* loop through the fill patterns */

  for (i=EMPTY_FILL; i<USER_FILL; i++)

  {

  /* set the fill style */

  setfillstyle(i, getmaxcolor());

  /* draw the 3-d bar */

  bar3d(midx-50, midy-50, midx+50, midy+50, 10, 1);

  getch();

  }

  /* clean up */

  closegraph();

  return 0;

  }

  函数名: bdos

  功 能: DOS系统调用

  用 法: int bdos(int dosfun, unsigned dosdx, unsigned dosal);

  程序例:

  #include <stdio.h>

  #include <dos.h>

  /* Get current drive as 'A', 'B', ... */

  char current_drive(void)

  {

  char curdrive;

  /* Get current disk as 0, 1, ... */

  curdrive = bdos(0x19, 0, 0);

  return('A' + curdrive);

  }

  int main(void)

  {

  printf("The current drive is %c:\n", current_drive());

  return 0;

  }

  函数名: bdosptr

  功 能: DOS系统调用

  用 法: int bdosptr(int dosfun, void *argument, unsigned dosal);

  程序例:

  #include <string.h>

  

   #include <stdio.h>

  #include <dir.h>

  #include <dos.h>

  #include <errno.h>

  #include <stdlib.h>

  #define BUFLEN 80

  int main(void)

  {

  char buffer[BUFLEN];

  int test;

  printf("Enter full pathname of a Directory\n");

  gets(buffer);

  test = bdosptr(0x3B,buffer,0);

  if(test)

  {

  printf("DOS error message: %d\n", errno);

  /* See errno.h for error listings */

  exit (1);

  }

  getcwd(buffer, BUFLEN);

  printf("The current directory is: %s\n", buffer);

  return 0;

  }

  函数名: bioscom

  功 能: 串行I/O通信

  用 法: int bioscom(int cmd, char abyte, int port);

  程序例:

  #include <bios.h>

  #include <conio.h>

  #define COM1 0

  #define DATA_READY 0x100

  #define TRUE 1

  #define FALSE 0

  #define SETTINGS ( 0x80 0x02 0x00 0x00)

  int main(void)

  {

  int in, out, status, DONE = FALSE;

  bioscom(0, SETTINGS, COM1);

  cprintf("... BIOSCOM [ESC] to exit ...\n");

  while (!DONE)

  {

  status = bioscom(3, 0, COM1);

  if (status & DATA_READY)

  if ((out = bioscom(2, 0, COM1) & 0x7F) != 0)

  putch(out);

  if (kbhit())

  {

  if ((in = getch()) == '\x1B')

  DONE = TRUE;

  bioscom(1, in, COM1);

  }

  }

  return 0;

  }

  函数名: biosdisk

  功 能: 软硬盘I/O

  用 法: int biosdisk(int cmd, int drive, int head, int track, int sector

  int nsects, void *buffer);

  程序例:

  #include <bios.h>

  #include <stdio.h>

  int main(void)

  {

  int result;

  char buffer[512];

  printf("Testing to see if drive a: is ready\n");

  result = biosdisk(4,0,0,0,0,1,buffer);

  result &= 0x02;

  (result) ? (printf("Drive A: Ready\n")) :

  (printf("Drive A: Not Ready\n"));

  return 0;

  }

  函数名: biosequip

  功 能: 检查设备

  用 法: int biosequip(void);

  程序例:

  #include <bios.h>

  #include <stdio.h>

  int main(void)

  {

  int result;

  char buffer[512];

  printf("Testing to see if drive a: is ready\n");

  result = biosdisk(4,0,0,0,0,1,buffer);

  result &= 0x02;

  (result) ? (printf("Drive A: Ready\n")) :

  (printf("Drive A: Not Ready\n"));

  return 0;

  }

  函数名: bioskey

  功 能: 直接使用BIOS服务的键盘接口

  用 法: int bioskey(int cmd);

  程序例:

  #include <stdio.h>

  #include <bios.h>

  #include <ctype.h>

  #define RIGHT 0x01

  #define LEFT 0x02

  #define CTRL 0x04

  #define ALT 0x08

  int main(void)

  {

  int key, modifiers;

  /* function 1 returns 0 until a key is pressed */

  while (bioskey(1) == 0);

  /* function 0 returns the key that is waiting */

  key = bioskey(0);

  /* use function 2 to determine if shift keys were used */

  

   modifiers = bioskey(2);

  if (modifiers)

  {

  printf("[");

  if (modifiers & RIGHT) printf("RIGHT");

  if (modifiers & LEFT) printf("LEFT");

  if (modifiers & CTRL) printf("CTRL");

  if (modifiers & ALT) printf("ALT");

  printf("]");

  }

  /* print out the character read */

  if (isalnum(key & 0xFF))

  printf("'%c'\n", key);

  else

  printf("%#02x\n", key);

  return 0;

  }

  函数名: biosmemory

  功 能: 返回存储块大小

  用 法:int biosmemory(void);

  程序例:

  #include <stdio.h>

  #include <bios.h>

  int main(void)

  {

  int memory_size;

  memory_size = biosmemory(); /* returns value up to 640K */

  printf("RAM size = %dK\n",memory_size);

  return 0;

  }

  函数名: biosprint

  功 能: 直接使用BIOS服务的打印机I/O

  用 法: int biosprint(int cmd, int byte, int port);

  程序例:

  #include <stdio.h>

  #include <conio.h>

  #include <bios.h>

  int main(void)

  {

  #define STATUS 2 /* printer status command */

  #define PORTNUM 0 /* port number for LPT1 */

  int status, abyte=0;

  printf("Please turn off your printer. Press any key to continue\n");

  getch();

  status = biosprint(STATUS, abyte, PORTNUM);

  if (status & 0x01)

  printf("Device time out.\n");

  if (status & 0x08)

  printf("I/O error.\n");

  if (status & 0x10)

  printf("Selected.\n");

  if (status & 0x20)

  printf("Out of paper.\n");

  if (status & 0x40)

  printf("Acknowledge.\n");

  if (status & 0x80)

  printf("Not busy.\n");

  return 0;

  }

  函数名: biostime

  功 能: 读取或设置BIOS时间

  用 法: long biostime(int cmd, long newtime);

  程序例:

  #include <stdio.h>

  #include <bios.h>

  #include <time.h>

  #include <conio.h>

  int main(void)

  {

  long bios_time;

  clrscr();

  cprintf("The number of clock ticks since midnight is:\r\n");

  cprintf("The number of seconds since midnight is:\r\n");

  cprintf("The number of minutes since midnight is:\r\n");

  cprintf("The number of hours since midnight is:\r\n");

  cprintf("\r\nPress any key to quit:");

  while(!kbhit())

  {

  bios_time = biostime(0, 0L);

  gotoxy(50, 1);

  cprintf("%lu", bios_time);

  gotoxy(50, 2);

  cprintf("%.4f", bios_time / CLK_TCK);

  gotoxy(50, 3);

  cprintf("%.4f", bios_time / CLK_TCK / 60);

  gotoxy(50, 4);

  cprintf("%.4f", bios_time / CLK_TCK / 3600);

  }

  return 0;

  }

  函数名: brk

  功 能: 改变数据段空间分配

  用 法: int brk(void *endds);

  程序例:

  #include <stdio.h>

  #include <alloc.h>

  int main(void)

  {

  char *ptr;

  printf("Changing allocation with brk()\n");

  ptr = malloc(1);

  printf("Before brk() call: %lu bytes free\n", coreleft());

  

   brk(ptr+1000);

  printf(" After brk() call: %lu bytes free\n", coreleft());

  return 0;

  }

  函数名: bsearch

  功 能: 二分法搜索

  用 法: void *bsearch(const void *key, const void *base, size_t *nelem,

  size_t width, int(*fcmp)(const void *, const *));

  程序例:

  #include <stdlib.h>

  #include <stdio.h>

  #define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))

  int numarray[] = {123, 145, 512, 627, 800, 933};

  int numeric (const int *p1, const int *p2)

  {

  return(*p1 - *p2);

  }

  int lookup(int key)

  {

  int *itemptr;

  /* The cast of (int(*)(const void *,const void*))

  is needed to avoid a type mismatch error at

  compile time */

  itemptr = bsearch (&key, numarray, NELEMS(numarray),

  sizeof(int), (int(*)(const void *,const void *))numeric);

  return (itemptr != NULL);

  }

  int main(void)

  {

  if (lookup(512))

  printf("512 is in the table.\n");

  else

  printf("512 isn't in the table.\n");

  return 0;

  }
 
 
[ 发表日期:2002-1-4 9:28:46 ] 函数名: bar 功 能: 画一个二维条形图 用 法: void far bar(int left, int top, int right, int bottom); 程序例: #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy, i; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ 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 */ } midx = getmaxx() / 2; midy = getmaxy() / 2; /* loop through the fill patterns */ for (i=SOLID_FILL; i<USER_FILL; i++) { /* set the fill style */ setfillstyle(i, getmaxcolor()); /* draw the bar */ bar(midx-50, midy-50, midx+50, midy+50); getch(); } /* clean up */ closegraph(); return 0; } 函数名: bar3d 功 能: 画一个三维条形图 用 法: void far bar3d(int left, int top, int right, int bottom, int depth, int topflag); 程序例: #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy, i; /* initialize graphics, local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ 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 error code */ } midx = getmaxx() / 2; midy = getmaxy() / 2; /* loop through the fill patterns */ for (i=EMPTY_FILL; i<USER_FILL; i++) { /* set the fill style */ setfillstyle(i, getmaxcolor()); /* draw the 3-d bar */ bar3d(midx-50, midy-50, midx+50, midy+50, 10, 1); getch(); } /* clean up */ closegraph(); return 0; } 函数名: bdos 功 能: DOS系统调用 用 法: int bdos(int dosfun, unsigned dosdx, unsigned dosal); 程序例: #include <stdio.h> #include <dos.h> /* Get current drive as 'A', 'B', ... */ char current_drive(void) { char curdrive; /* Get current disk as 0, 1, ... */ curdrive = bdos(0x19, 0, 0); return('A' + curdrive); } int main(void) { printf("The current drive is %c:\n", current_drive()); return 0; } 函数名: bdosptr 功 能: DOS系统调用 用 法: int bdosptr(int dosfun, void *argument, unsigned dosal); 程序例: #include <string.h> #include <stdio.h> #include <dir.h> #include <dos.h> #include <errno.h> #include <stdlib.h> #define BUFLEN 80 int main(void) { char buffer[BUFLEN]; int test; printf("Enter full pathname of a Directory\n"); gets(buffer); test = bdosptr(0x3B,buffer,0); if(test) { printf("DOS error message: %d\n", errno); /* See errno.h for error listings */ exit (1); } getcwd(buffer, BUFLEN); printf("The current directory is: %s\n", buffer); return 0; } 函数名: bioscom 功 能: 串行I/O通信 用 法: int bioscom(int cmd, char abyte, int port); 程序例: #include <bios.h> #include <conio.h> #define COM1 0 #define DATA_READY 0x100 #define TRUE 1 #define FALSE 0 #define SETTINGS ( 0x80 0x02 0x00 0x00) int main(void) { int in, out, status, DONE = FALSE; bioscom(0, SETTINGS, COM1); cprintf("... BIOSCOM [ESC] to exit ...\n"); while (!DONE) { status = bioscom(3, 0, COM1); if (status & DATA_READY) if ((out = bioscom(2, 0, COM1) & 0x7F) != 0) putch(out); if (kbhit()) { if ((in = getch()) == '\x1B') DONE = TRUE; bioscom(1, in, COM1); } } return 0; } 函数名: biosdisk 功 能: 软硬盘I/O 用 法: int biosdisk(int cmd, int drive, int head, int track, int sector int nsects, void *buffer); 程序例: #include <bios.h> #include <stdio.h> int main(void) { int result; char buffer[512]; printf("Testing to see if drive a: is ready\n"); result = biosdisk(4,0,0,0,0,1,buffer); result &= 0x02; (result) ? (printf("Drive A: Ready\n")) : (printf("Drive A: Not Ready\n")); return 0; } 函数名: biosequip 功 能: 检查设备 用 法: int biosequip(void); 程序例: #include <bios.h> #include <stdio.h> int main(void) { int result; char buffer[512]; printf("Testing to see if drive a: is ready\n"); result = biosdisk(4,0,0,0,0,1,buffer); result &= 0x02; (result) ? (printf("Drive A: Ready\n")) : (printf("Drive A: Not Ready\n")); return 0; } 函数名: bioskey 功 能: 直接使用BIOS服务的键盘接口 用 法: int bioskey(int cmd); 程序例: #include <stdio.h> #include <bios.h> #include <ctype.h> #define RIGHT 0x01 #define LEFT 0x02 #define CTRL 0x04 #define ALT 0x08 int main(void) { int key, modifiers; /* function 1 returns 0 until a key is pressed */ while (bioskey(1) == 0); /* function 0 returns the key that is waiting */ key = bioskey(0); /* use function 2 to determine if shift keys were used */ modifiers = bioskey(2); if (modifiers) { printf("["); if (modifiers & RIGHT) printf("RIGHT"); if (modifiers & LEFT) printf("LEFT"); if (modifiers & CTRL) printf("CTRL"); if (modifiers & ALT) printf("ALT"); printf("]"); } /* print out the character read */ if (isalnum(key & 0xFF)) printf("'%c'\n", key); else printf("%#02x\n", key); return 0; } 函数名: biosmemory 功 能: 返回存储块大小 用 法:int biosmemory(void); 程序例: #include <stdio.h> #include <bios.h> int main(void) { int memory_size; memory_size = biosmemory(); /* returns value up to 640K */ printf("RAM size = %dK\n",memory_size); return 0; } 函数名: biosprint 功 能: 直接使用BIOS服务的打印机I/O 用 法: int biosprint(int cmd, int byte, int port); 程序例: #include <stdio.h> #include <conio.h> #include <bios.h> int main(void) { #define STATUS 2 /* printer status command */ #define PORTNUM 0 /* port number for LPT1 */ int status, abyte=0; printf("Please turn off your printer. Press any key to continue\n"); getch(); status = biosprint(STATUS, abyte, PORTNUM); if (status & 0x01) printf("Device time out.\n"); if (status & 0x08) printf("I/O error.\n"); if (status & 0x10) printf("Selected.\n"); if (status & 0x20) printf("Out of paper.\n"); if (status & 0x40) printf("Acknowledge.\n"); if (status & 0x80) printf("Not busy.\n"); return 0; } 函数名: biostime 功 能: 读取或设置BIOS时间 用 法: long biostime(int cmd, long newtime); 程序例: #include <stdio.h> #include <bios.h> #include <time.h> #include <conio.h> int main(void) { long bios_time; clrscr(); cprintf("The number of clock ticks since midnight is:\r\n"); cprintf("The number of seconds since midnight is:\r\n"); cprintf("The number of minutes since midnight is:\r\n"); cprintf("The number of hours since midnight is:\r\n"); cprintf("\r\nPress any key to quit:"); while(!kbhit()) { bios_time = biostime(0, 0L); gotoxy(50, 1); cprintf("%lu", bios_time); gotoxy(50, 2); cprintf("%.4f", bios_time / CLK_TCK); gotoxy(50, 3); cprintf("%.4f", bios_time / CLK_TCK / 60); gotoxy(50, 4); cprintf("%.4f", bios_time / CLK_TCK / 3600); } return 0; } 函数名: brk 功 能: 改变数据段空间分配 用 法: int brk(void *endds); 程序例: #include <stdio.h> #include <alloc.h> int main(void) { char *ptr; printf("Changing allocation with brk()\n"); ptr = malloc(1); printf("Before brk() call: %lu bytes free\n", coreleft()); brk(ptr+1000); printf(" After brk() call: %lu bytes free\n", coreleft()); return 0; } 函数名: bsearch 功 能: 二分法搜索 用 法: void *bsearch(const void *key, const void *base, size_t *nelem, size_t width, int(*fcmp)(const void *, const *)); 程序例: #include <stdlib.h> #include <stdio.h> #define NELEMS(arr) (sizeof(arr) / sizeof(arr[0])) int numarray[] = {123, 145, 512, 627, 800, 933}; int numeric (const int *p1, const int *p2) { return(*p1 - *p2); } int lookup(int key) { int *itemptr; /* The cast of (int(*)(const void *,const void*)) is needed to avoid a type mismatch error at compile time */ itemptr = bsearch (&key, numarray, NELEMS(numarray), sizeof(int), (int(*)(const void *,const void *))numeric); return (itemptr != NULL); } int main(void) { if (lookup(512)) printf("512 is in the table.\n"); else printf("512 isn't in the table.\n"); return 0; }
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