C or C++ codefor a scientific or graphing calculator

#include<iostream.h>
#include<process.h>
#include<math.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
#include<stdio.h>
#include<stdlib.h>
    class figurecal
         {
     public:
    char ch1,ch,ch2,ch3,ch4;
    char ans;
    int a,b,c,res,cir,cho,cu,cub,con,cyl,sph,y0,l;
    int color;
    int bottom1;
    int midx, midy;
    int stangle , endangle;
    int xradius,yradius;
    int x1,y1;
    int left,top,right,bottom;
    int a1,a2,a3,a4,b1,b2,b3,b4;
    float x,y,z,d,w,side,area,pm,len,bre,rad,circum;
    float sector,segment,rho,g,par,base,h,angle,arc,rad1,rad2,sh;
    float d1,d2,vol;
    float root1,root2,disc,s;
    long double lo;
     };
//        **        //
float addi(int a,int b);
float sub(int a,int b);
float mult(int a,int b);
float divi(int a,int b);
float rem(int a ,int b);
float disc(int a,int b,int c);
float roots(int a,int b,int disc);
//        **          //
float tri_roc(int a,int b,int c,int d);
float c_a1(int a);
float c_a2(int a);
float area(int a,int b);
float area(int a,int b,int c);
float peri(int a,int b);
float peri(int a,int b,int c);
float diag(int a,int b);
float circum1(int a);
float circum2(int a);
float rh_side(int a,int b);
float trap_area(int a,int b,int c);
float circ_sec(int a,int b);
float circ_arc(int a,int b);
//        **        //
float cu_vol(int a,int b,int c);
float cu_sa(int a,int b,int c);
float cu_diag(int a,int b,int c);
float cyl_vol(int a,int b);
float cyl_sa(int a,int b);
float cyl_csa(int a,int b);
float ho_cyl_vol(int a1,int a2,int b);
float ho_cyl_sa(int a1,int a2,int b);
float ho_cyl_csa(int a1,int a2,int b);
float con_vol(int a,int b);
float con_sa(int a,int b);
float con_csa(int a,int b);
float sph_vol(int a);
float sph_sa(int a);
float sem_sph_sa(int a);
float sem_sph_vol(int a);
float sem_sph_csa(int a);
void main()
{
clrscr();
figurecal o;
int gdriver=DETECT,gmode;
initgraph(&gdriver,&gmode,"c:\\tc\\bin\\bgi");
o.color=0;
o.bottom1=0;
o.stangle = 0, o.endangle = 360;
o.xradius = 280, o.yradius = 180;
delay(1100);
for(;o.bottom1<=470;o.bottom1++)
 {
 setcolor(12);
 delay(6);
 rectangle(0,10,650,o.bottom1);
 }
   o.midx = getmaxx() / 2;
   o.midy = getmaxy() / 2;
   setcolor(10);
   setbkcolor(12);
 for(o.x1=160,o.y1=0;o.y1<190;o.y1++,o.color++)
  {
  delay(12);
  cleardevice();
  setcolor(o.color);
  settextstyle(4,0,7);
  outtextxy(o.x1,o.y1,"WELCOME");
  }
 for(;o.xradius>131,o.yradius>81;o.xradius--,o.yradius--,o.color++)
   {
   setcolor(o.color);
   ellipse(o.midx, o.midy, o.stangle, o.endangle,o.xradius, o.yradius);
   delay(20);
   cleardevice();
   settextstyle(4,0,7);
   outtextxy(160,190,"WELCOME");
   }
   setbkcolor(4);
   setcolor(14);
   settextstyle(4,0,7);
   outtextxy(160,190,"WELCOME");
delay(3400);
clrscr();
setbkcolor(4);
settextstyle(4,0,4);
outtextxy(80,30,"Project On:");
for( o.w=15;o.w>0;o.w--)
{
settextstyle(4,0,7);
setcolor(o.w);
delay(300);
outtextxy(50,100,"Scientific Calculator");
}
setcolor(14);
sound(900);
delay(300);
nosound();
sound(1100);
delay(270);
nosound();
sound(1200);
settextstyle(6,0,2);
outtextxy(50,400,"Guided by: Mr.Sanjay Ojha sir");
delay(270);
nosound();
delay(300);
sound(1200);
delay(270);
nosound();
sound(1100);
delay(180);
nosound();
sound(900);
delay(270);
nosound();
sound(800);
delay(270);
nosound();
delay(200);
sound(800);
delay(270);
nosound();
settextstyle(6,0,2);
outtextxy(50,430,"Project by: MADHU M P .. [EMAIL="madhumurundi@gmai.com"]madhumurundi@gmai.com[/EMAIL]");
delay(500);
sound(1200);
delay(270);
nosound();
delay(200);
sound(1200);
delay(270);
nosound();
sound(1100);
delay(270);
nosound();
sound(900);
delay(270);
nosound();
sound(800);
delay(270);
nosound();
delay(200);
sound(800);
delay(270);
nosound();
delay(400);
sound(900);
delay(230);
nosound();
sound(300);
delay(200);
nosound();
getch();
cout<<"\n\n\n\n\n";
again:
cleardevice();
setcolor(14);
setbkcolor(5);
settextstyle(6,0,4);
outtextxy(140,45,"Select one of the following");
cout<<"\n\n\n\n\t\t1)Basic calculations(+,-..) \n\n\t\t2)2-D figures \n\n\t\t3)3-D figures\n\n\t\t4)Other trignometric & log functions\n\n\t\t5)Exit";
cout<<"\n\n\n\n\n\t\tPlease enter your choice: ";
cin>>o.ch;
clrscr();
cleardevice();
switch(o.ch)
{
 case '1':
 //basic:
 settextstyle(6,0,4);
 outtextxy(70,50,"Welcome to basic arithmetic calculations");
 cout<<"\n\n\n\n\n\n\n\t\t1)Addition\n\n\t\t2)Substraction\n\n\t\t3)Multiplication\n \n\t\t4)Division\n\n\t\t5)Remainder\n\n\t\t6)Roots of quadratic equation \n\n\t\t7)Exit\n\n\t\t Enter your choice:";
 cin>>o.ch1;
 clrscr();
 cleardevice();

   switch(o.ch1)
      {
    case'1':
    settextstyle(10,0,9);
    outtextxy(500,20,"+");
    settextstyle(6,0,5);
    outtextxy(120,30,"Addition");
    cout<<"\n\n\n\n\n\n\n\t\tEnter two numbers(use space to seperate no.s):";
    cin>>o.a>>o.b;
    o.res=addi(o.a,o.b);
    cout<<"\n\n\n\t\tThe sum is "<<o.res;
    getch();
    break;

    case'2':settextstyle(6,0,5);
    outtextxy(120,30,"Substration");
    cout<<"\n\n\n\n\n\n\n\t\tEnter two numbers(use space to seperate no.s):";
    cin>>o.a>>o.b;
    o.res=sub(o.a,o.b);
    cout<<"\n\n\t\t The difference is"<<o.res;
    getch();
    break;

    case'3':settextstyle(6,0,5);
    outtextxy(120,30,"Multiplation");
    cout<<"\n\n\n\n\n\n\n\t\tEnter two numbers(use space to seperate no.s):";
    cin>>o.a>>o.b;
    o.res=mult(o.a,o.b);
    cout<<"\n\t\t The product is "<<o.res;
    getch();
    goto repeat;
    //break;

    case'4':settextstyle(6,0,5);
    outtextxy(120,30,"Division");
    cout<<"\n\n\n\n\n\n\n\t\tEnter two numbers(use space to seperate no.s):";
    cin>>o.a>>o.b;
    if(o.b==0)
        {    cout<<"\n\t\t Divide by zero error!!";
            goto repeat;
        }
    else
        {
        o.res=divi(o.a,o.b);
        cout<<"\n\t\t The result is "<<o.res;
        getch();}
        break;

    case'5':
    settextstyle(10,0,5);
    outtextxy(500,20,"%");
    {settextstyle(6,0,5);
    outtextxy(120,30,"Remainder");
    cout<<"\n\n\n\n\n\n\n\t\tEnter two numbers(use space to seperate no.s):";
    cin>>o.a>>o.b;
    if(o.b==0)
           { cout<<"\n\t\t Divide by zero error!!";
         goto repeat;
           }
    else
        {
        o.res=rem(o.a,o.b);
        cout<<"\n\t\t The result is "<<o.res;
        getch();
        }
        break;

    case'6': settextstyle(6,0,5);
    outtextxy(120,30,"Roots of quadratic equation");
    cout<<"\n\n\n\n\n\n\n\t\tEnter three no.s a,b&c of \n\n\t\tax^2 + bx + c:\n\n\t\t(use space to seperate no.s)";
        cin>>o.a>>o.b>>o.c;
        if(o.a==0)
         {cout<<"\n\t\tValue of a should not be zero";
         getch();
         goto repeat;
         }
        else
         {
         o.disc=disc(o.a,o.b,o.c);
          if(o.disc>0)
           {
        o.root1=roots(o.a,o.b,o.disc);
        o.root2=roots(o.a,o.b,o.disc);
        cout<<"\n\t\tRoots are real and unequal\n\t\t";
        cout<<"Root1 = "<<o.root1;
        cout<<"\n\t\tRoot2 = "<<o.root2<<endl<<endl<<endl;
        getch();
        break;
           }
          else if(o.disc==0)
          {o.root1=-o.b/(2*o.a);
           o.root2=o.root1;
           cout<<"\n\n\t\tRoots are real and equal";
           cout<<"\n\t\tRoot1 = "<<o.root1;
           cout<<"\n\t\tRoot2 = "<<o.root2;
           getch();
           break;
           }
           else
           cout<<"\n\n\t\tRoots are complex and imaginary";
         }
         break;

    case'7':  goto repeat;
      }
      }//end of switch ch1
       break;

 case'2'://cleardevice();
  setbkcolor(5);
  settextstyle(6,0,4);
  outtextxy(120,30,"Welcome to 2D figures");
  cout<<"\n\n\n\n\n\n\n\t\t1)Square\t\t2)Rectangle\n\n\t\t3)Triangle\t\t4)Parallelogram\n\n\t\t5)Circle\t\t6)Semi-Circle\n\n\t\t7)Rhombus\t\t8)Trapezium\n\n\t\t9)Exit";
  cout<<"\n\n\t\tEnter your choice:";
  cin>>o.ch2;
  clrscr();
  cleardevice();
  switch(o.ch2)
   {
     case'1':
     for( o.a1=100,o.a2=200,o.a3=200,o.a4=100,o.b1=200,o.b2=200,o.b3=300,o.b4=300;o.a1<475,o.a2<575,o.a3<525,o.a4<425;o.a1++,o.a2++,o.a3++,o.a4++)
     {
     cleardevice();
     line(o.a1,o.b1,o.a2,o.b2);
     line(o.a2,o.b2,o.a3,o.b3);
     line(o.a1,o.b1,o.a4,o.b4);
     line(o.a3,o.b3,o.a4,o.b4);
     delay(10);
     }
     settextstyle(6,0,5);
     outtextxy(130,30,"Square");
     cout<<"\n\n\n\n\n\n\t\t1)Area\n\n\t\t2)Perimeter\n\n\t\t3)Diagonal\n\n\t\t4)Exit";
     cout<<"\n\n\t\tEnter your choice:";
     cin>>o.cho;
     if(o.cho==1)
      {
      cout<<"\n\t\tEnter the length of side:";
      cin>>o.side;
      o.area=area(o.side,o.side);
      cout<<"\n\t\tThe area is "<<o.area;
      getch();
      break;
      }
     else if(o.cho==2)
     {
     cout<<"\n\t\tEnter the length of side:";
     cin>>o.side;
     o.pm=peri(o.side,o.side);
     cout<<"\n\t\tThe perimeter is "<<o.pm;
     getch();
     break;
     }
     else if(o.cho==3)
     {
     cout<<"\n\t\tEnter the side:";
     cin>>o.side;
     o.d=diag(o.side,o.side);
     cout<<"\n\t\tThe length of diagonal is "<<o.d;
     getch();
     break;
          }
     else if(o.cho==4)
     goto repeat;
     break;

     case'2':
     for(o.a1=150,o.a2=300,o.a3=300,o.a4=150,o.b1=200,o.b2=200,o.b3=270,o.b4=270;o.a1<475,o.a2<575,o.a3<525,o.a4<425;o.a1++,o.a2++,o.a3++,o.a4++)
     {
     cleardevice();
     line(o.a1,o.b1,o.a2,o.b2);
     line(o.a2,o.b2,o.a3,o.b3);
     line(o.a1,o.b1,o.a4,o.b4);
     line(o.a3,o.b3,o.a4,o.b4);
     delay(5);
     }
     setcolor(14);
     settextstyle(6,0,5);
     outtextxy(130,30,"Rectangle");
     cout<<"\n\n\n\n\n\n\t\t1)Area\n\n\t\t2)Perimeter\n\n\t\t3)Diagonal\n\n\t\t4)Exit";
     cout<<"\n\n\t\tEnter your choice:";
     cin>>o.cho;
     if(o.cho==1)
     {
         cout<<"\n\n\t\tEnter the length and breadth:";
         cin>>o.len>>o.bre;
         o.area=area(o.len,o.bre);
         cout<<"\n\n\t\tThe area is "<<o.area;
         getch();
         break;
     }
     else if(o.cho==2)
     {
     cout<<"\n\n\t\tEnter the length and breadth:";
     cin>>o.len>>o.bre;
     o.pm=peri(o.len,o.bre);
     cout<<"\n\n\t\tThe perimeter is "<<o.pm;
     getch();
     break;
     }
     else if(o.cho==3)
     {
     cout<<"\n\n\t\tEnter the length and breadth:";
     cin>>o.len>>o.bre;
     o.d=diag(o.len,o.bre);
     cout<<"\n\n\t\tThe length of diagonal is "<<o.d;
     getch();
     break;
     }
     else if(o.cho==4)
     goto repeat;
     break;

     case'3':
     for(o.a1=80,o.a2=150,o.a3=0,o.b1=250,o.b2=350,o.b3=350;o.a1<450,o.a2<500,o.a3<350;o.a1++,o.a2++,o.a3++)
     {
     cleardevice();
     line(o.a1,o.b1,o.a2,o.b2);
     line(o.a2,o.b2,o.a3,o.b3);
     line(o.a1,o.b1,o.a3,o.b3);
     delay(5);
     }
     settextstyle(6,0,5);
     outtextxy(130,30,"Triangle");
     cout<<"\n\n\n\n\n\n\t\t1)Area\t\t\t2)Perimeter\n\n\t\t3)Radius of incircle\t4)Radius of cimcumcircle\n\n\t\t5)Exit";
     cout<<"\n\n\t\tEnter your choice:";
     cin>>o.cho;
     if(o.cho==1)
     {
     cout<<"\n\n\t\tEnter the sides a,b &c:";
     cin>>o.x>>o.y>>o.z;
     o.area=area(o.x,o.y,o.z);
     cout<<"\n\n\t\tThe area is "<<o.area;
     getch();
     break;
     }
     else if(o.cho==2)
     {
     cout<<"\n\n\t\tEnter the sides a,b &c:";
     cin>>o.a>>o.b>>o.c;
     o.pm=peri(o.a,o.b,o.c);
     cout<<"\n\n\t\tThe perimeter is "<<o.pm;
     getch();
     break;
     }
     else if(o.cho==3)
     {
     cout<<"\n\n\t\tEnter the sides a,b &c:";
     cin>>o.x>>o.y>>o.z;
     o.s=(o.x+o.y+o.z)/2;
     o.area=area(o.x,o.y,o.z);
     o.rad= o.area/o.s;
     cout<<"\n\n\t\tThe radius of incircle is "<<o.rad;
     getch();
     break;
     }
     else if(o.cho==4)
     {
     cout<<"\n\n\t\tEnter the sides a,b &c:";
     cin>>o.x>>o.y>>o.z;
     o.s=(o.x+o.y+o.z)/2;
     o.area=area(o.x,o.y,o.z);
     o.rad=tri_roc(o.x,o.y,o.z,o.area);
     cout<<"\n\n\t\tThe radius of circumcircle is "<<o.rad;
     getch();
     break;
     }
     else
     goto repeat;

     case'4':
     for(o.a1=100,o.a2=232,o.a3=180,o.a4=50,o.b1=200,o.b2=200,o.b3=270,o.b4=270;o.a1<425,o.a2<525,o.a3<475,o.a4<375;o.a1++,o.a2++,o.a3++,o.a4++)
     {
     cleardevice();
     line(o.a1,o.b1,o.a2,o.b2);
     line(o.a2,o.b2,o.a3,o.b3);
     line(o.a1,o.b1,o.a4,o.b4);
     line(o.a3,o.b3,o.a4,o.b4);
     delay(5);
     }
     settextstyle(6,0,5);
     outtextxy(130,30,"Parallelogram");
     cout<<"\n\n\n\n\n\n\t\t1)Area\t\t2)Perimeter\n\n\t\t3)Exit";
     cout<<"\n\n\t\tEnter your choice:";
     cin>>o.cho;
     if(o.cho==1)
     {
     cout<<"\n\n\t\tEnter the length of base and height:";
     cin>>o.base>>o.h;
     o.area=area(o.base,o.h);
     cout<<"\n\n\t\tThe area is"<<o.area;
     getch();
     break;
     }
     else if(o.cho==2)
     {
     cout<<"\n\n\t\tEnter the length and breadth:";
     cin>>o.len>>o.bre;
     o.pm=peri(o.len,o.bre);
     cout<<"\n\n\t\tThe perimeter is"<<o.pm;
     getch();
     break;
     }
     else if(o.cho==3)
     goto repeat;
     break;

     case'5':
        for(o.rad=0;o.rad<80;o.rad++)
        {
        cleardevice();
        circle(450,300,o.rad);
        delay(5);
        }
     settextstyle(6,0,5);
     outtextxy(130,30,"Circle");
     cout<<"\n\n\n\n\n\n\t\t1)Area\t\t\t\t2)Circumference\n\n\t\t3)Length of an arc\t\t4)Area of sector\n\n\t\t5)Area of segment\t\t6)Exit";
     cout<<"\n\n\t\tEnter your choice:";
     cin>>o.cho;
        if(o.cho==1)
        {
        cout<<"\n\n\t\tEnter the radius of circle:";
        cin>>o.rad;
        o.area=c_a1(o.rad);
        cout<<"\n\n\t\tThe area is "<<o.area;
        getch();
        break;
        }
        else if(o.cho==2)
        {
        cout<<"\n1\n\t\tEnter the radius of circle:";
        cin>>o.rad;
        o.circum= circum1(o.rad);
        cout<<"\n\n\t\tThe circumference is "<<o.circum;
        getch();
        break;
        }
        else if(o.cho==3)
        {
        cout<<"\n\n\t\tEnter the radius and angle:";
        cin>>o.rad>>o.angle;
        o.arc=circ_arc(o.rad,o.angle);//
        cout<<"\n\n\t\tThe length of arc is "<<o.arc;
        getch();
        break;
        }
        else if(o.cho==4)
        {
        cout<<"\n\n\t\tEnter the radius and angle:";
        cin>>o.rad>>o.angle;
        o.sector=circ_sec(o.rad,o.angle);
        cout<<"\n\n\t\tThe area of sector is "<<o.sector;
        getch();
        break;
        }
        else if(o.cho==5)
        {
        cout<<"\n\n\t\tEnter the radius and angle:";
        cin>>o.rad>>o.angle;
        o.sector=circ_sec(o.rad,o.angle);
        o.area=0.5*o.rad*o.rad*sin(o.angle);
        o.segment=  o.sector-o.area;
        cout<<"\n\n\t\tThe area of segment is "<<o.segment;
        getch();
        break;
        }
           break;

     case'6':
        for(o.a1=0;o.a1<181;o.a1++)
        {
        cleardevice();
        setfillstyle(EMPTY_FILL,12);
        pieslice(450,300,0,o.a1,80);
        delay(10);
        }
        settextstyle(6,0,5);
        outtextxy(130,30,"Semi Circle");
        cout<<"\n\n\n\n\n\n\t\t1)Area\t\t\t\t2)Circumference\n\n\t\t3)Exit";
        cout<<"\n\n\t\tEnter your choice:";
        cin>>o.cho;
        if(o.cho==1)
        {
        cout<<"\n\n\t\tEnter the radius of semi-circle:";
        cin>>o.rad;
        o.area=(3.14*o.rad*o.rad)/2;
        cout<<"\n\n\t\tThe area is "<<o.area;
        getch();
        break;
        }
        else if(o.cho==2)
        {
        cout<<"\n\n\t\tEnter the radius of semi-circle:";
        cin>>o.rad;
        o.circum=5.14*o.rad;
        cout<<"\n\n\t\tThe circumference is "<<o.circum;
        getch();
        break;
        }
        else if(o.cho==3)
        goto repeat;
        break;

     case'7':
        for(o.a1=100,o.a2=200,o.a3=180,o.a4=80,o.b1=200,o.b2=200,o.b3=270,o.b4=270;o.a1<425,o.a2<525,o.a3<475,o.a4<380;o.a1++,o.a2++,o.a3++,o.a4++)
        {
        cleardevice();
        line(o.a1,o.b1,o.a2,o.b2);
        line(o.a2,o.b2,o.a3,o.b3);
        line(o.a1,o.b1,o.a4,o.b4);
        line(o.a3,o.b3,o.a4,o.b4);
        delay(10);
        }
        settextstyle(6,0,5);
        outtextxy(130,30,"Rhombus");
        cout<<"\n\n\n\n\n\n\t\t1)Area\t\t2)Perimeter\n\n\t\t3)Side\t\t4)Exit";
        cout<<"\n\n\t\tEnter your choice:";
        cin>>o.cho;
        if(o.cho==1)
        {
        cout<<"\n\n\t\tEnter the length of diagonals:";
        cin>>o.d1>>o.d2;
        o.area=0.5*o.d1*o.d2;
        cout<<"\n\n\t\tThe area is "<<o.area;
        getch();
        break;
        }
        else if(o.cho==2)
        {
        cout<<"\n\n\t\tEnter the length of side:";
        cin>>o.side;
        o.pm=4*o.side;
        cout<<"\n\n\t\tThe perimeter is "<<o.pm;
        getch();
        break;
        }
        else if(o.cho==3)
        {
        cout<<"\n\n\t\tEnter the length of diagonals:";
        cin>>o.d1>>o.d2;
        o.side=rh_side(o.d1,o.d2);
        cout<<"\n\n\t\tThe length of side is "<<o.side;
        getch();
        break;
        }
        else
        goto repeat;

     case'8':
        for(o.a1=100,o.a2=160,o.a3=190,o.a4=70,o.b1=200,o.b2=200,o.b3=270,o.b4=270;o.a1<425,o.a2<525,o.a3<475,o.a4<380;o.a1++,o.a2++,o.a3++,o.a4++)
        {
        cleardevice();
        line(o.a1,o.b1,o.a2,o.b2);
        line(o.a2,o.b2,o.a3,o.b3);
        line(o.a1,o.b1,o.a4,o.b4);
        line(o.a3,o.b3,o.a4,o.b4);
        delay(10);
        }
        settextstyle(6,0,5);
        outtextxy(130,30,"Trapezium");
        cout<<"\n\n\n\n\n\n\t\t1)Area\t\t2)Exit";
        cout<<"\n\n\t\tEnter your choice:";
        cin>>o.cho;
        if(o.cho==1)
        {
        cout<<"\n\n\t\tEnter the lengths of parallel sides \n\t\tand distance between them:";
        cin>>o.d1>>o.d2>>o.h;
        o.area=trap_area(o.d1,o.d2,o.h);
        cout<<"\n\n\t\tThe area is "<<o.area;
        getch();
        break;
        }
        else
        goto repeat;

     case'9':goto repeat;
           }   break;

  case'3':clrscr();
  cleardevice();
  setbkcolor(5);
  settextstyle(6,0,4);
  outtextxy(120,30,"Welcome to 3-D figures");
  cout<<"\n\n\n\n\n\n\n\t\t1)Cube\t\t2)Cubiod\n\n\t\t3)Cylinder\t4)Hollow cylinder\n\n\t\t5)Cone\t\t6)Sphere\n\n\t\t7)Hemisphere\t8)Exit";
  cout<<"\n\n\t\tEnter your choice:";
  cin>>o.ch3;
  clrscr();
  cleardevice();
  switch(o.ch3)
   {
    case'1':for(o.a1=0,o.a2=100,o.a3=100,o.a4=0,o.b1=0,o.b2=0,o.b3=100,o.b4=100;o.a1<450,o.a2<550,o.a3<450,o.a4<550,o.b1<250,o.b2<250,o.b3<350,o.b4<350;o.a1+=2,o.a2+=2,o.a3+=2,o.a4+=2,o.b1++,o.b2++,o.b3++,o.b4++)
     {
     cleardevice();
     line(o.a1,200,o.a2,200);
     line(o.a2,200,o.a3,300);
     line(o.a1,200,o.a4,300);
     line(o.a3,300,o.a4,300);
     delay(10);
     line(450,o.b1,550,o.b2);
     line(550,o.b2,550,o.b3);
     line(450,o.b1,450,o.b4);
     line(550,o.b3,450,o.b4);
     delay(11);
     }
     delay(190);
     line(o.a1,200,449,o.b1);
     delay(190);
     line(549,o.b2,o.a2,200);
     delay(190);
     line(449,o.b4,o.a4,300);
     delay(190);
     line(549,o.b3,o.a3,300);
     delay(190);
        settextstyle(6,0,5);
        outtextxy(130,30,"Cube");
        cout<<"\n\n\n\n\n\n\t\t1)Volume\t\t2)Surface area\n\n\t\t3)Diagonal\t\t4)Exit";
        cout<<"\n\n\t\tEnter your choice:";
        cin>>o.cu;
          if(o.cu==1)
        {
        cout<<"\n\n\t\tEnter side:";
        cin>>o.side;
        o.vol=cu_vol(o.side,o.side,o.side);
        cout<<"\n\n\t\tThe volume is "<<o.vol;
        getch();
        break;
        }
          else if(o.cu==2)
        {
        cout<<"\n\n\t\tEnter the length of side:";
        cin>>o.side;
        o.area=cu_sa(o.side,o.side,o.side);
        cout<<"\n\n\t\tThe surface area is "<<o.area;
        getch();
        break;
        }
          else if(o.cu==3)
        {
        cout<<"\n\n\t\tEnter the side:";
        cin>>o.side;
        o.d=cu_diag(o.side,o.side,o.side);
        cout<<"\n\n\t\tThe diagonal is "<<o.d;
        getch();
        break;
        }
         else if(o.cu==4)
        goto repeat;
        break;