C語言函數(shù)大全(n,o開頭)

void normvideo(void );
    選擇正常亮度字符。
    將文本屬性（前景和背景）置為啟動程序時它所具有的值，來選擇標準字符。
    void nosound(void );
    關(guān)閉由調(diào)用 sound而發(fā)聲的揚聲器。
    函數(shù)名: open
    功 能: 打開一個文件用于讀或?qū)?BR>    用 法: int open(char *pathname, int access[, int permiss]);
    程序例:
    #include
    #include
    #include
    #include
    int main(void)
    {
    int handle;
    char msg[] = "Hello world";
    if ((handle = open("TEST.$$$", O_CREAT | O_TEXT)) == -1)
    {
    perror("Error:");
    return 1;
    }
    write(handle, msg, strlen(msg));
    close(handle);
    return 0;
    }
    函數(shù)名: outport
    功 能: 輸出整數(shù)到硬件端口中
    用 法: void outport(int port, int value);
    程序例:
    #include
    #include
    int main(void)
    {
    int value = 64;
    int port = 0;
    outportb(port, value);
    printf("Value %d sent to port number %d\n", value, port);
    return 0;
    }
    函數(shù)名: outportb
    功 能: 輸出字節(jié)到硬件端口中
    用 法: void outportb(int port, char byte);
    程序例:
    #include
    #include
    int main(void)
    {
    int value = 64;
    int port = 0;
    outportb(port, value);
    printf("Value %d sent to port number %d\n", value, port);
    return 0;
    }
    函數(shù)名: outtext
    功 能: 在視區(qū)顯示一個字符串
    用 法: void far outtext(char far *textstring);
    程序例:
    #include
    #include
    #include
    #include
    int main(void)
    {
    /* request auto detection */
    int gdriver = DETECT, gmode, errorcode;
    int midx, midy;
    /* 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;
    /* move the C.P. to the center of the screen */
    moveto(midx, midy);
    /* output text starting at the C.P. */
    outtext("This ");
    outtext("is ");
    outtext("a ");
    outtext("test.");
    /* clean up */
    getch();
    closegraph();
    return 0;
    }
    函數(shù)名: outtextxy
    功 能: 在指定位置顯示一字符串
    用 法: void far outtextxy(int x, int y, char *textstring);
    程序例:
    #include
    #include
    #include
    #include
    int main(void)
    {
    /* request auto detection */
    int gdriver = DETECT, gmode, errorcode;
    int midx, midy;
    /* 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;
    /* output text at the center of the screen*/
    /* Note: the C.P. doesn’t get changed.*/
    outtextxy(midx, midy, "This is a test.");
    /* clean up */
    getch();
    closegraph();
    return 0;
    }