c++ - Code debugging error Arduino -

i facing 2 errors below program:

1. on serial monitor not printing in main().
2. when enter lcd_call() function. if key being pressed goes next case. per program should stay in same window going case 1.

void setup() {   serial.begin(9600); }  void loop() {   serial.println("in main");   lcd_call(); }  void lcd_call() {   int menuoption=0;   int button;     {     switch(menuoption)     {     case 0:       serial.println("set+date:");       display_date_time();        timedbeep(shortbeep,1);       break;     case 1:       serial.println("display:");       lcdclear();       lcd.print("display menu");        timedbeep(shortbeep,1);          break;     case 2:       serial.println("set menu:");       lcdclear();       lcd.print("set menu");        timedbeep(shortbeep,1);          break;     }     button=read_lcd_buttons();     if(button==btnright)     {       menuoption=menuoption+1;       if(menuoption>2)       {         menuoption=0;       }     }     else     {       menuoption;      }      }   while(menuoption<menuoptions); }