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C语言库函数大全(字母b)---使用说明  

2008-07-09 08:49:07|  分类: C语言 |  标签: |举报 |字号 订阅

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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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