1. #include<stdio.h>
#include<conio.h>
#include<dos.h>
#include<graphics.h>
int initmouse();
void showptr();
void openwindow();
void closewindow();
void hideptr();
void getmousepos(int *,int*,int*);
void restrictptr(int,int,int,int);
int button,x,y,x1,y1,x2,y2,s;
long double num=0,get,num1=0,result=0;
long double addnum(int);
char opr;
int a,b,r,s,i1,count,c,sq,newnum=1,d=0;
union REGS i,o;
void main()
{
int driver=DETECT,mode;
int q,p[12];
char input;
char *inpu[4][4]={"1","2","3","4",
"5","6","7","8",
"9","0","+","-" ,
"*","/","clr","="};
char inp[4][4]={'1','2','3','4',
'5','6','7','8',
'9','0','+','-' ,
'*','/','l','='};
initgraph(&driver,&mode,"c:tcbgi");
if(initmouse()==0)
{
printf("not");
getch();
exit(0);
}
openwindow();
getch();
cleardevice();
setfillstyle(CLOSE_DOT_FILL,10);
bar(260,82,450,320);
bar(430,70,450,320);
setfillstyle(1,GREEN);
bar(236,82,432,300);
setcolor(GREEN);
rectangle(238,50,430,80);
rectangle(237,49,431,81);
rectangle(236,48,432,82);
c=240;
d=100;
s=0;
for(a=0;a<4;a++)
{
c=240;
for(b=0;b<4;b++)
{
setfillstyle(1,RED);
bar(c,d,c+40,d+40);
setcolor(YELLOW);
outtextxy(c+10,d+14,inpu[a][b]);
c+=50;
}
d+=50;

2. }
showptr();
num=0;
gotoxy(36,5);
printf("%18.1Lf",num);
count=0;
while(!kbhit())
{
outtextxy(30,20,"Press any key to exit..");
i1=0;
c=240;
d=100;
rectangle(0,0,638,478);
getmousepos(&button,&x,&y);
for(a=0;a<4;a++)
{
c=240;
for(b=0;b<4;b++)
{
if((x>=c&&x<=c+40)&&(y>=d&&y<=d+40))
{
if((button&1)==1)
{
while((button&1)==1)
{
setcolor(10);
rectangle(c,d,c+40,d+40);
rectangle(c-1,d-1,c+41,d+41);
rectangle(c-2,d-2,c+42,d+42);
break;
}
delay(100);
setcolor(GREEN);
rectangle(c,d,c+40,d+40);
rectangle(c-1,d-1,c+41,d+41);
rectangle(c-2,d-2,c+42,d+42);
input=inp[a][b];
switch(input)
{
case '1':
get=addnum(1);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '2':
get=addnum(2);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '3':
get=addnum(3);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '4':
get=addnum(4);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '5':
get=addnum(5);
gotoxy(36,5);
printf("%18.1Lf",get);
break;

3. case '6':
get=addnum(6);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '7':
get=addnum(7);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '8':
get=addnum(8);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '9':
get=addnum(9);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '0':
get=addnum(0);
gotoxy(36,5);
printf("%18.1Lf",get);
break;
case '+':
num1=num;
num=0;
opr='+';
gotoxy(36,5);
printf("%18.1Lf",num);
break;
case '-':
num1=num;
num=0;
opr='-';
gotoxy(36,5);
printf("%18.1Lf",num);
break;
case '*':
num1=num;
num=0;
opr='*';
gotoxy(36,5);
printf("%18.1Lf",num);
break;
case '/':
num1=num;
num=0;
opr='/';
gotoxy(36,5);
printf("%18.1Lf",num);
break;
case 'l':
num=0;
num1=0;
result=0;
count=0;
gotoxy(36,5);
printf("%18.1Lf",num);
break;
case '=':
switch(opr)
{

4. case '+':
case '-':
if(count<1)
{
result=num+num1;
}
else
{
result=result+num;
}
gotoxy(36,5);
printf("%18.1Lf",result);
count+=1;
break;
if(count<1)
{
result=num1-num;
}
else
{
result=result-num;
}
gotoxy(36,5);
printf("%18.1Lf",result);
count+=1;
break;
case '*':
case '/':
if(count<1)
{
result=num1*num;
}
else
{
result=result*num;
}
gotoxy(36,5);
printf("%18.1Lf",result);
count+=1;
break;
if(count<1)
{
result=num1/num;
}
else
{
result=result/num;
}
gotoxy(36,5);
printf("%18.1Lf",result);
count+=1;
break;
}
}
}
}
c+=50;
}
d+=50;
}
setcolor(YELLOW);
delay(150);
}
getch();

5. closewindow();
getch();
}
long double addnum(int getnum)
{
num=num*10+getnum;
return(num);
}
int initmouse()
{
i.x.ax=0;
int86(0x33,&i,&o);
return(o.x.ax);
}
void showptr()
{
i.x.ax=1;
int86(0x33,&i,&o);
}
void hideptr()
{
i.x.ax=2;
int86(0x33,&i,&o);
}
void restrictptr(int x1,int y1,int x2,int y2)
{
i.x.ax=7;
o.x.cx=x1;
o.x.dx=x2;
int86(0x33,&i,&o);
i.x.ax=8;
o.x.cx=y1;
o.x.dx=y2;
int86(0x33,&i,&o);
}
void getmousepos(int *button,int *x,int *y)
{
i.x.ax=3;
int86(0x33,&i,&o);
*button=o.x.bx;
*x=o.x.cx;
*y=o.x.dx;
}
void openwindow()
{
int aa,bb,cc,dd,maxx,maxy,i=10;
maxx=getmaxx();
maxy=getmaxy();
rectangle(0,0,maxx,maxy);
aa=250;
bb=400;
cc=260;
for(dd=250;dd<350;dd+=20)
{
setfillstyle(1,2);
bar(dd,bb,cc,bb+10);
cc+=20;
}
aa=250;
bb=400;
cc=260;
while(!kbhit())
{
setcolor(BLUE);

6. outtextxy(20,116,"Press any key to continue.......");
if((aa==350)&&(cc==360))
{
aa=250;
cc=260;
continue;
}
else
{
setcolor(10);
rectangle(aa,bb,cc,bb+10);
rectangle(aa-1,bb-1,cc+1,bb+11);
}
delay(300);
setcolor(BLACK);
rectangle(aa,bb,cc,bb+10);
rectangle(aa-1,bb-1,cc+1,bb+11);
aa+=20;
cc+=20;
}
}
void closewindow()
{
int i,j,k;
cleardevice();
rectangle(0,0,638,478);
k=0;
while(!kbhit())
{
setcolor(k);
settextstyle(5,0,8);
outtextxy(100,200,"THANK YOU");
line(90,300,600,300);
delay(200);
k++;
}
}

7. outtextxy(20,116,"Press any key to continue.......");
if((aa==350)&&(cc==360))
{
aa=250;
cc=260;
continue;
}
else
{
setcolor(10);
rectangle(aa,bb,cc,bb+10);
rectangle(aa-1,bb-1,cc+1,bb+11);
}
delay(300);
setcolor(BLACK);
rectangle(aa,bb,cc,bb+10);
rectangle(aa-1,bb-1,cc+1,bb+11);
aa+=20;
cc+=20;
}
}
void closewindow()
{
int i,j,k;
cleardevice();
rectangle(0,0,638,478);
k=0;
while(!kbhit())
{
setcolor(k);
settextstyle(5,0,8);
outtextxy(100,200,"THANK YOU");
line(90,300,600,300);
delay(200);
k++;
}
}