Piano : Using C/C++ and Graphics

Hey guys, today I am going to post one awesome program which I have been working for a quiet long time. It's not complete yet though, I will try to complete it soon. It's mini piano which we can play using keyboard. Press the keys as shown in the keyboard layout in the out put screen to play piano. If you want to exit, press Esc key.

Here's the screenshot of the output.

Here's the code:

Note: Please save the file in .cpp extension if it is showing error. Make sure your speaker works properly because this program generates different sound according to key pressed.
/*
    Programmer: Ashok Kumar Shrestha (ak007)
    Program Description: mini piano v 1.0
*/



#include<stdio.h>
#include<conio.h>
#include<dos.h>
#include<graphics.h>
#include<process.h>

getkey()
{
    union REGS i,o;
    while(!kbhit());
    i.h.ah=0;
    int86(22,&i,&o);
    return (o.h.ah);
}

void welcome()
{
    clrscr();
    gotoxy(30,4);
    printf("Welcome to mini piano.");
    gotoxy(22,8);
    printf("Programmer: Ashok Kumar Shrestha (ak007)");
    gotoxy(30,12);
    printf("Project: Mini Piano v1.0");
    gotoxy(25,20);
    printf("Press any key to play piano......");
    gotoxy(32,24);
    printf("Press Esc to exit");
    getch();
}

void layout()
{
    int x=getmaxx()/2,y=getmaxy()/2;
    int bar_wh=150,bar_wb=40,bar_bh=90,bar_bb=35;
    setfillstyle(1,0);
    bar(10,10,620,460);
    int i,x1=x-bar_wb*6,y1=y-bar_wh-50;

    char str[10];
    char mat1[12]={'Q','W','E','R','T','Y','U','I','O','P','[',']'};
    char mat2[12]={'1','2','3','4','5','6','7','8','9','0','-','+'};
    char mat3[12]={0,'Z','X','C','V','B','N','M',',','.','/'};
    char mat4[12]={0,0,'S','D','F','G','H','J','K','L',';',0};

    setcolor(0);
    settextstyle(2,0,7);
    setfillstyle(1,15);
    for(i=0;i<12;i++)
    {       setcolor(0);
        bar3d(x1+i*bar_wb,y1,x1+(i+1)*bar_wb-2,y1+bar_wh,6,7);
        setcolor(0);
        sprintf(str,"%c",mat1[i]);
        outtextxy(x1+i*bar_wb+17,y1+bar_wh-30,str);
    }
    for(i=1;i<=10;i++)
    {
        bar3d(x1+i*bar_wb,y1+bar_wh+50,x1+(i+1)*bar_wb-2,y1+2*bar_wh+50,6,7);
        sprintf(str,"%c",mat3[i]);
        outtextxy(x1+i*bar_wb+17,y1+2*bar_wh+20,str);
    }
    setfillstyle(1,0);
    for(i=1;i<=10;i++)
    {       if(i!=4&&i!=7)
        {
            bar(x1+i*bar_wb-bar_bb/2,y1,x1+i*bar_wb-2+bar_bb/2,y1+bar_bh);
            setcolor(8);
            rectangle(x1+i*bar_wb-bar_bb/2+1,y1,x1+i*bar_wb-2+bar_bb/2-1,y1+bar_bh-1);
            setcolor(15);
            sprintf(str,"%c",mat2[i]);
            outtextxy(x1+i*bar_wb+12-bar_bb/2,y1+bar_bh-30,str);
        }
    }
    for(i=2;i<=10;i++)
    {       if(i!=4&&i!=8)
        {    bar(x1+i*bar_wb-bar_bb/2,y1+bar_wh+50,x1+i*bar_wb-2+bar_bb/2,y1+bar_wh+50+bar_bh);
            setcolor(8);
            rectangle(x1+i*bar_wb-bar_bb/2+1,y1+bar_wh+50,x1+i*bar_wb-2+bar_bb/2-1,y1+bar_wh+50+bar_bh-1);
            setcolor(15);
            sprintf(str,"%c",mat4[i]);
            outtextxy(x1+i*bar_wb+12-bar_bb/2,y1+bar_wh+bar_bh+20,str);
        }
    }
}
int piano()
{
    int gd=DETECT,gm;
    initgraph(&gd,&gm,"..\\bgi");
    layout();
    int soun[100]={22,23,24,26,27,29,31,33,35,37,39,41,44,46,49,52,55,58,62,65,69,73,78,82,87,92,98,104,110,116,123,131,139,147,155,165,175,185,196,208,220,233,245,262,277,294,311,330,349,370,392,415,440,466,494,523,554,587,622,659,698,740,784,831,880,932,988,1046,1109,1175,1244,1328,1397,1480,1568,1661,1760,1865,1975,2093,2217,2349,2489,2637,2749,2960,3136,3322,3520,3729,3951,4186};
    int f,ch,octave=4,freq;
    while(1)
    {
        ch=getkey();
                  switch(ch)
        {
            case 1: return 0;

            case 16: f =octave*12+0;    break;
            case 17: f =octave*12+2;    break;
            case 18: f =octave*12+4;    break;
            case 19: f =octave*12+6;    break;
            case 20: f =octave*12+7;    break;
            case 21: f =octave*12+9;    break;
            case 22: f =octave*12+11;    break;
            case 23: f =octave*12+12;    break;
            case 24: f =octave*12+14;    break;
            case 25: f =octave*12+16;    break;
            case 26: f =octave*12+18;    break;
            case 27: f =octave*12+19;    break;

            case 3: f =octave*12+1;        break;
            case 4: f =octave*12+3;        break;
            case 5: f =octave*12+5;        break;
            case 7: f =octave*12+8;        break;
            case 8: f =octave*12+10;    break;
            case 10: f =octave*12+13;    break;
            case 11: f =octave*12+15;    break;
            case 12: f =octave*12+17;    break;


            case 53: f =octave*12-1;    break;
            case 52: f =octave*12-3;    break;
            case 51: f =octave*12-5;    break;
            case 50: f =octave*12-6;    break;
            case 49: f =octave*12-8;    break;
            case 48: f =octave*12-10;    break;
            case 47: f =octave*12-12;    break;
            case 46: f =octave*12-13;    break;
            case 45: f =octave*12-15;    break;
            case 44: f =octave*12-17;    break;

            case 39: f =octave*12-2;    break;
            case 38: f =octave*12-4;    break;
            case 36: f =octave*12-7;    break;
            case 35: f =octave*12-9;    break;
            case 34: f =octave*12-11;    break;
            case 32: f =octave*12-14;    break;
            case 31: f =octave*12-16;    break;

            case 77:
            case 72: if(octave<6)    octave++; break;
            case 75:
            case 80: if(octave>1)    octave--; break;

            default:    freq =0;
        }
        if(freq!=0)
        {
            freq =soun[f];
            sound(freq);
            delay(120);
            nosound();
        }
        else
            freq=1;
    }
}
int  main()
{
    welcome();
    piano();
    return 0;
}
//End of the program