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Displaying  Source Code(s)  
 

 
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<BR>, 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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