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C语言库函数 (B类字母)

2008-06-01 02:08:27  编辑来源:互联网  宽屏版  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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