#include<iostream>

#include<stdlib.h>

using namespace std;

int main()

{

float x,y,rad;

int row,col, hgt,wth;

char circle[500][500];

cout<<” Enter the size of the plane: “;

// to define the coordinate plane

cin>>hgt>>wth;

for(int r=0;r<hgt;r++)

//define the array ( array of spaces) to store the points to be plotted

{

for(int c=0;c<wth;c++)

{

circle[r][c]=’ ‘;

}

}

cout<<”Enter the radius: “;

cin>>rad;

y=rad;

x=0;

int sum=2*x*x+2*y*y+4*x-2*y-2*rad*rad+3;

//sum, the decision variable, used in bresenham algorithm

do

{

if(sum<0)

{

x=x+0.5;

sum=sum+4*x+6;

// to compute the next point when sum<0

}

else

{

x=x+0.5;

y=y-0.5;

sum=sum+4*(x-y)+10;

// to compute the next point when sum>0

}

row=hgt/3+x*0.53;

// reaching the middle of the graph height-wise as per the 1.5 pixel ratio (2*1.5=3)

col=wth/2+y;

//reaching the middle of the graph width-wise

circle[row][col]=’*’;

row=hgt/3-x*0.53;

//computing the row and the column number to reach the point on the plane and store them in the array circle

col=wth/2+y;

circle[row][col]=’*’;

row=hgt/3+x*0.53;

//rest points are plotted as per the symmetry of the circle (7 more points can be obtained from a single point coordinates)

col=wth/2-y;

circle[row][col]=’*’;

row=hgt/3-x*0.53;

col=wth/2-y;

circle[row][col]=’*’;

row=hgt/3+y*0.53;

col=wth/2+x;

circle[row][col]=’*’;

row=hgt/3-y*0.53;

col=wth/2+x;

circle[row][col]=’*’;

row=hgt/3+y*0.53;

col=wth/2-x;

circle[row][col]=’*’;

row=hgt/3-y*0.53;

col=wth/2-x;

circle[row][col]=’*’;

}

while(x<=y);

// the condition to be satisfied for bresenham algorithm

for(int r=1;r<hgt/1.5;r++)

// print the array to display the circle

{

for(int c=1;c<wth;c++)

{

cout<<circle[r][c];

}

cout<<endl;

}

return 0;

}

Here’s the screenshot of what the output looks like :

9 1 D:\llllllll.cpp [Error] stray ‘\224’ in program,I had run an error in this programe.

This might have occurred because you copied the code directly to the compiler. Try writing it manually by yourself. It should work then, I suppose !