Ｃ语言函数大全(B开头)

    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
    #include
    #include
    #include
    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 {
    /* 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
    #include
    #include
    #include
    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 {
    /* 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
    #include
    /* 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
    #include
    #include
    #include
    #include
    #include
    #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); [Page]
    /* 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
    #include
    #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
    #include
    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
#include
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
#include
#include
#define RIGHT 0x01
#define LEFT 0x02
#define CTRL 0x04
#define ALT 0x08