Difference between abstract class and interface.

Difference between method overloading and overriding.

   

Implementation of Flood fill algorithm

Q) Implementation of Flood Fill Algorithm.
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
void floodfill(int x,int y)
    { 
int a =getpixel(x,y);
    setcolor(3);
    if(a==0)
{
    putpixel(x,y,3);
     floodill(x+1,y);
     floodfill(x-1,y);
    floodfill(x,y+1);
     floodfill(x,y-1);
    }
    }

int main()
{

   int gdriver = DETECT, gmode;
   initgraph(&gdriver, &gmode, "C:\\TC\\bgi");
   setcolor(2);
   circle(250, 250, 50);
   bounfill(250,250);
   getch();
   closegraph();
   return 0;
}

Bresenham's circle drawing

Q)Circle generation using bresenham’s circle drawing algorithm.
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include<iostream.h>
void drawcir(float x,float y,float p,float q){
putpixel(x+p,y+q,3);
putpixel(x-p,y+q,3);
putpixel(x+p,y-q,3);
putpixel(x-p,y-q,3);
putpixel(x+q,y+p,3);
putpixel(x-q,y+p,3);
putpixel(x+q,y-p,3);
putpixel(x-q,y-p,3);
    }
int main()
{
   int gdriver = DETECT, gmode;
   initgraph(&gdriver, &gmode, "C:\\TC\\bgi");
   float gx,gy,grad;
   cout<<"enter the x coordinateof the centre";
   cin>>gx;
   cout<<"enter the y coor of the centre";
   cin>>gy;
  cout<<"enter the radious of the circle";
  cin>>grad;
  float p=0;
  float q=grad;
  float d=3-2*grad;
  while(p<q){
  drawcir(gx,gy,p,q);
p++;
if(d<0)
{d=d+4*p+6;
}
  else{
q--;
  d=d+4*(p-q)+10;
  }
drawcir(gx,gy,p,q);
  }
   getch();
   closegraph();
   return 0;
}

Implementation of boundary fill algorithm

Q)Boundary fill algorithm.
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
void bounfill(int x,int y)
    { 
int a =getpixel(x,y);
    setcolor(3);
    if(a!=2&&a!=3)
{
    putpixel(x,y,3);
    bounfill(x+1,y);
    bounfill(x-1,y);
    bounfill(x,y+1);
    bounfill(x,y-1);
    }
    }

int main()
{

   int gdriver = DETECT, gmode;
   initgraph(&gdriver, &gmode, "C:\\TC\\bgi");
   setcolor(2);
   circle(250, 250, 50);
   bounfill(250,250);
   getch();
   closegraph();
   return 0;
}

Filehandeling in c++

Q) Program in C++ to read a text file and convert all letters into uppercase and save on another text file.

#include<iostream>
#include<stdio.h>
using namespace std;

void uppercase()
{char p;
char chi;
    FILE *fp;
    FILE *rp;

    fp=fopen("rem.txt","r");
    rp=fopen("mem.txt","w");
    char ch =getc(fp);

    while(ch!=EOF)
    {

        if(97<=ch&&ch<=122)
        {p=ch;
           p=p-32;
           cout<<p;
        putc(p,rp);
        }

      else
        {  chi=ch;
        cout<<ch;
        putc(chi,rp);
      }
 ch=getc(fp);

    }}
int main()
{
  uppercase();
   
return 0;
}

Filehandeling :Reading a text file

Q) Program to  read a text file and calculate number of tabs,new lines,spaces,characters in it.

#include <iostream>
#include<stdio.h>
using namespace std;

int main()

{
int tab=0,lines=0,pa=0,charec=0;
FILE *fp;
char ch;
fp=fopen("mim.txt","r");
ch=getc(fp);
    while(ch!=EOF)
    {   if(ch=='\t')
       tab++;
       if(ch=='\n')
       lines++;
       if(ch==' ')
       pa++;
       charec++;
       ch=getc(fp);
    }

cout<<"number of tabs ="<<tab<<endl;
cout<<"number of new lines ="<<lines<<endl;
cout<<"number of spaces ="<<pa<<endl;
cout<<"number of characters ="<<charec<<endl;
fclose(fp);
return 0;
}