Program to demonstrate the making of flowchart using concept of inheritance



Program to demonstrate the making of flowchart using concept of inheritance

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
#include<graphics.h>
#include<stdlib.h>

int flag=0;
int xval;

class shape
{
 protected:
 static int line0;
 static int line1;

 public:

 shape()                /* Constructor used for initialisation */
 {
  line0=1;
  line1=0;
 }

 output(char *text,int a,int b,int ln)
 {
  outtextxy(b+95+xval,line0+a,text);
  getch();
   line0 =line0 + ln;

  if(flag==1)
   line1=line1+ln;
 }


 void adjust()
 {
  line0 = line0 - line1;
  line1=0;
 }
};
int shape::line0 = 0;
int shape::line1 = 0;

class rect:public shape
{
 public:

 void draw(char *in)
 {
  rectangle(xval+50,line0+20,xval+200,line0+40);
  output(in,25,0,40);
 }
};

class cir:public shape
{
 public:

 void draw(char *in)
 {
  circle(xval+120,line0+40,20
  );
  output(in,36,22,60);
 }
};

class isos:public shape
{
 public:

 void draw(char *in)
 {
  line(xval+50,line0+20,xval+200,line0+20);
  line(xval+40,line0+40,xval+190,line0+40);
  line(xval+50,line0+20,xval+40,line0+40);
  line(xval+200,line0+20,xval+190,line0+40);

  output(in,25,0,40);
 }
};

class diamond:public shape
{
 public:

 draw(char *in)
 {
  line(xval+120,line0+20,xval+50,line0+40);
  line(xval+120,line0+20,xval+190,line0+40);
  line(xval+50,line0+40,xval+120,line0+60);
  line(xval+190,line0+40,xval+120,line0+60);
  outtextxy(xval+100,line0+62,"Y");
  outtextxy(xval+195,line0+25,"N");

  output(in,35,0,60);

 }
};

class myline:public shape
{
 public:

 void draw()
 {
  line(xval+120,line0,xval+120,line0+20);
 }
};

class myline1:public shape
{
 public:

 void draw()
 {
  line(xval+190,line0-20,xval+290,line0-20);
  line(xval+290,line0-20,xval+290,line0+20);

 }
};

class myline2:public shape
{
 public:

 void draw()
 {
  line(xval+120,line0,xval+120,line0+10);
  line(xval+120,line0+10,xval-50,line0+10);

 }
};

class myline3:public shape
{
 public:

 void draw()
 {
  line(xval+120,line0,xval+120,line0+20);
 }
};

   class graph
      {
 public:
  void close()
     {
  closegraph();
  restorecrtmode();
     }
    }g;

    int  main(void)
     {
       int gdriver, gmode,errorcode;
       clrscr();
       gdriver = DETECT;
  /* initialize graphics mode */
       initgraph(&gdriver, &gmode, " ");

  /* read result of initialization */
       errorcode = graphresult();

 if (errorcode != grOk)  /* an error occurred */
  {
     printf("Graphics error: %s
", grapherrormsg(errorcode));
     printf("Press any key to halt:");
     getch();
     exit(1);             /* return with error code */
  }
 shape s;
 rect r;
 cir c;
 isos i;
 diamond d;
 myline l;
 myline1 l1;
 myline2 l2;
 myline3 l3;
 cleardevice();
 c.draw("B");                 /* Begin  */
 l.draw();
 i.draw("Input a");
 l.draw();
 i.draw("Input b");
 l.draw();
 r.draw("c = a+b");
 l.draw();
 d.draw("Is c > 100");
 l.draw();
 l1.draw();

 flag=1;
 xval=170;
 i.draw("Print NO");
 l2.draw();
 s.adjust();
 flag=0;
 xval=0;

 i.draw("print YES");
 l.draw();
 c.draw("F");      /* Finish */

 outtextxy(240,50,"Flowchart to be read in downward direction. ");
 getch();
 g.close();
 return(0);
      }
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Program to demonstrate the making of flowchart using concept of inheritance

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