Calculator:

#include"graphics.h"
#include"dos.h"
#include"stdio.h"
#include"math.h"
union REGS i,o;
char text[35][25]={
"7","8","9","*","4",& quot;5","6","/","1","2"," 3","+","0","00",".","-&qu ot;,"M","M+",
"M-","+/-","MR","MC","x^2& quot;,"sr","OFF","AC","CE","=& quot;};

int s=0,k=0,pass,op,prop,newnum=1,bt,memo=1,d=0,sq;
long double num=0,accum,m;
void normalbutton(int,int,int,int,char *);
void main()
{
int gd=DETECT,gm,x1,x2,y1,y2,i,j,maxx,maxy,x,y,button;
initgraph(&gd,&gm,"");
if(initmouse()==0)
{
closegraph();
restorecrtmode();
printf(" Mouse driver not loded");
exit(1);
}
setcolor(2);
gotoxy(20,10);
printf("WELCOME TO ISTE
");
gotoxy(20,14);
printf("press any key to continue.......
");
getch();
cleardevice();
showmouseptr();
movemouseptr(&x,&y);
setcolor(15);
rectangle(198,140,417,163);
rectangle(199,141,418,164);
rectangle(197,139,416,162);
rectangle(185,130,430,450);
rectangle(184,129,431,451);
rectangle(182,127,433,454);
rectangle(181,126,434,453);
setfillstyle(SOLID_FILL,3);
//bar(200,142,415,161);
outtextxy(50,25,"A Calculator project in C presented by B.NARAYANA
MOORTHY
AND R.KARTHIK KEYAN");
outtextxy(200,100,"Press OFF button to exit....");
y1=140;
y2=160;
for(j=0;j<7;j++)
{
x1=200;
x2=235;
y1+=40;
y2+=40;
for(i=0;i<4;i++)
{
normalbutton(x1,x2,y1,y2,text[s]);
s++;
x1+=60;
x2+=60;
}
}
while(1)
{
getmousepos(&button,&x,&y);
y1=140;
y2=160;
for(j=0;j<7;j++)
{
x1=200;
x2=235;
y1+=40;
y2+=40;
for(i=0;i<4;i++)
{
if((x<x2&&x>x1)&&(y<y2&&y>y1))
{
if((button&1)==1)
{
gotoxy(28,10);
bt=j*4+i;
setcolor(11);
outtextxy(x1+12,y1+7,text[j*4+i]);
if(num>pow(10.0,18))
exit();
delay(10);
delay(250);
delay(10);
switch (bt)
{
case 8 :
addnum(1);
break;
case 9 :
addnum(2);
break;
case 10 :
addnum(3);
break;
case 4 :
addnum(4);
break;
case 5 :
addnum(5);
break;
case 6 :
addnum(6);
break;
case 0 :
addnum(7);
break;
case 1 :
addnum(8);
break;
case 2 :
addnum(9);
break;
case 12 :
addnum(0);
break;
case 11 :
operation(1); // plus
break;
case 15 :
operation(2); // minus
break;
case 3 :
operation(3); // multiplication
break;
case 7 :
operation(4); // division
break;
case 13:
doublezero();
break;
case 14 :
decimal();
break;
case 16:
m=m;
printf("%25.5Lf",m); //memory call
break;
case 20:
printf("%25.5Lf",m);
break;
case 19:
plusminus();
break;
case 17:
m=m+num; //memory plus
break;
case 18:
m=m-num; //memory minus
break;
case 21:
clearm();
break;
case 22 :
square();
break;
case 23:
sqroot();
break;
case 24:
hidemouseptr();
setcolor(1);
cleardevice();
setcolor(14);
outtextxy(225,200,"THANK YOU");
delay(2000);
exit();
break;
case 25:
allclear();
break;
case 26:
clear();
break;
case 27:
num=operation(5); // equalto
break;
}
setcolor(1);
outtextxy(x1+12,y1+7,text[j*4+i]);
}
}
x1+=60;

x2+=60;
}
}
}
}
void normalbutton(int x1,int x2,int y1,int y2,char *text)
{
setcolor(15);
rectangle(x1-2,y1-2,x2+1,y2+1);
rectangle(x1-1,y1-1,x2+2,y2+2);
setcolor(5);
rectangle(x1,y1,x2+2,y2+2);
rectangle(x1,y1,x2+1,y2+1);
setfillstyle(SOLID_FILL,14);
bar(x1,y1,x2,y2);
setcolor(1);
outtextxy(x1+12,y1+7,text);
k++;
}

initmouse()
{
i.x.ax=0;
int86 (0x33,&i,&o);
return(o.x.ax);
}
hidemouseptr()
{
i.x.ax=2;
int86(0x33,&i,&o);
return 0;
}

showmouseptr()
{
i.x.ax=1;
int86(0x33,&i,&o);
return 0;
}
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;
return 0;
}
/* Move mouse ptr to x,y */
movemouseptr(int *x,int *y)
{
i.x.ax=4;
int86(0x33,&i,&o);
o.x.cx=*x;
o.x.dx=*y;
return 0;
}
addnum(int pass)
{ if(sq)
newnum=1;

if(newnum)
{ if(d)
{
num=pass/(pow(10.0,d));
d++;
newnum=0;
}
else
{ num=pass;
newnum=0;
}
}
else
{
if(d)
{
if(num<0)
num=num-pass/(pow(10.0,d));
else
num=num+pass/(pow(10.0,d));
d++;
}
else
{
num=num*10+pass;
}
}
printf("%25.5Lf",num);
return ;
}
operation(int opr)
{ long double pnum;
pnum=num;

if(newnum && (prop != 5) && memo)
{
}
else
{ newnum=1;
d=0;
sq=0;
switch(prop)
{
case 1:
accum=accum+pnum;
break;
case 2:
accum=accum-pnum;
break;
case 3:
accum=accum*pnum;
break;
case 4:
accum=accum/pnum;
break;
default:
accum=pnum;
}
}
prop=opr;
num=accum;
printf("%25.5Lf",num);
return num;
}
allclear()
{
sq=0;
accum=0;
num=0;
d=0;
newnum=1;
printf("%25.5Lf",num);
return;
}
plusminus()
{ if(num!=0)
{ num*=-1;
printf("%25.5Lf",num);
}
return;
}
clearm()
{
m=0;
//printf("%25.5Lf",m);
return;
}
decimal()
{
if(!d)
{
d=1;
if(newnum==1)
{
num=0;
}
printf("%25.5Lf",num);
}
return;
}
square()
{
sq=1;
num*=num;
printf("%25.5Lf",num);
return;
}
sqroot()
{ sq=1;
num=pow(num,0.5);
printf("%25.5Lf",num);
return;
}
doublezero()
{
if(d)
{
d++;
d++;
}
else
num*=100;
printf("%25.5Lf",num);
return;
}
clear()
{
num=0;
printf("%25.5Lf",num);
return;
}