调用bios喇叭发声

#include <windows.h>
#include <iostream>
#include <map>
using namespace std;

const int DO = 261;
const int RE = 293;
const int MI = 329;
const int FA = 349;
const int SO = 392;
const int LA = 440;
const int TI = 493;

const int DO_ = 130;
const int RE_ = 147;
const int MI_ = 165;
const int FA_ = 174;
const int SO_ = 186;
const int LA_ = 220;
const int TI_ = 247;

int frequency(char note){
    static map<const char,int> table;
    
    if(table.size() == 0){
        table['1'] = DO;    
        table['2'] = RE;            
        table['3'] = MI;    
        table['4'] = FA;    
        table['5'] = SO;    
        table['6'] = LA;    
        table['7'] = TI;    
        
        table['c'] = DO_;    
        table['d'] = RE_;            
        table['e'] = MI_;    
        table['f'] = FA_;    
        table['g'] = SO_;    
        table['a'] = LA_;    
        table['b'] = TI_;    
    }
        
    return table.find(note) -> second;
}

class music{
    private:
        string notes;
        int tenuto;
    public:
        music(string &song , int tenuto_) { notes = song; tenuto = tenuto_; play(notes.end(),tenuto);}
        void play(string::iterator it,int duration );
};
void music::play(string::iterator it, int duration){
    char note = *it;
    
    if( it == notes.begin() )
        return;
    
    if( note == '-') 
        play( it - 1, duration + tenuto);
    else {
        if( isalnum(note) ) {
            play( it - 1, 0);
            
            Beep(frequency(note), tenuto + duration);
        } else
            play( it - 1, duration);
    }
    
}

 string bee = "\
 5 3 3 - | 4 2 2 - | 1 2 3 4 | 5 5 5 - | \
 5 3 3 - | 4 2 2 - | 1 3 5 5 | 3 3 3 - | \
 2 2 2 2 | 2 3 4 - | 3 3 3 3 | 3 4 5 - | \
 5 3 3 - | 4 2 2 - | 1 3 5 5 | 1 3 1 - |  \
 ";
 
 string happynewyear = "\
						  1 1 1 - g - | 3 3 3 - 1 - | 1 3 5 - 5 - | \
						  4 3 2 - - - | 2 3 4 - 4 - | 3 2 3 - 1 - | \
						  1 3 2 - g - | b 2 1 - - - | \
						  ";
 
 int main()
 {    
	 music m(bee, 300);
	 
	 music m2(happynewyear, 200);
	 
	 return 0;
 }