C语言函数大全--b开头的函数

#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;
}

#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;
}

#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;
}

#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;
}

#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;
}

#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;
}

#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;
}

#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;
}

#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;
}

#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;
}

#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;
}

#include <stdlib.h>
#include <stdio.h>

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

int numarray[] = {1, 2, 3, 5, 6, 8, 9, 10, 12, 14};

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 = (int(*))bsearch(&key, numarray, NELEMS(numarray), sizeof(int), (int(*)(const void *,const void *))numeric);
    return (itemptr != NULL);
}

int main(void)
{
    int a;
    printf("Please input key: ");
    scanf("%d", &a);
    if (lookup(a))
        printf("%d is in the table.\n", a);
    else
        printf("%d isn't in the table.\n", a);
    return 0;
}