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  1. #include<graphics.h>
  2. #include<stdio.h>
  3. #include<math.h>
  4.  
  5. //Function to plot the ellipse
  6. void pixel (int xc, int yc, int x,int y)
  7. {
  8.  putpixel(320+(xc+x),240-(yc+y),14);
  9.  putpixel(320+(xc+x),240-(yc-y),14);
  10.  putpixel(320+(xc-x),240-(yc-y),14);
  11.  putpixel(320+(xc-x),240-(yc+y),14);
  12. }
  13.  
  14. int main()
  15. {
  16.  int xc, yc, x, y, p, rx, ry;
  17.  
  18.  int gdriver=DETECT, gmode; //Detects the graphics drivers automatically
  19.  initgraph(&gdriver, &gmode,""); //Initialize to graphics mode
  20.  
  21.  printf("Enter the co-ordinates of the center of the ellipse : ");
  22.  scanf("%d %d",&xc,&yc);
  23.  printf("Enter the value of rx and ry of the ellipse : ");
  24.  scanf("%d %d",&rx,&ry);
  25.  
  26.     //Take start position as(0,ry)
  27.     x=0;
  28.  y=ry;
  29.  
  30.  p=(ry*ry)-(rx*rx*ry)+((rx*rx)/4); //Finding decision parameter p in region 1
  31.  
  32.     //To plot the quadrants
  33.     line(0,240,639,240);
  34.     line(320,0,320,479);
  35.     outtextxy(295,243,"0,0");
  36.     setcolor(WHITE);
  37.  
  38.  pixel (xc, yc, x, y);
  39.  
  40.  while((2*x*ry*ry)<(2*y*rx*rx)) //At each x position in region 1
  41.  {
  42.   if(p<0) //If decision parameter is less than 0
  43.   {
  44.    x++; //Increment x
  45.    p=p+(2*ry*ry*x)+(ry*ry); //Calculate the new decision parameter
  46.   }
  47.   else //If decision parameter is greater than 0
  48.         {
  49.             x++; //Increment x
  50.             y--; //Decrement y
  51.             p=p+(2*ry*ry*x)+(ry*ry)-(2*rx*rx*y); //Calculate the new decision parameter
  52.         }
  53.         pixel (xc, yc, x, y);
  54.  }
  55.  
  56.     p=ry*ry*pow((float)x+0.5,2) + rx*rx*pow(y-1,2)-rx*rx*ry*ry; //Finding decision parameter p in region 2
  57.     pixel (xc, yc, x, y);
  58.  
  59.     while(y>=0) //At each y position in region 2
  60.     {
  61.   if(p>0) //If decision parameter is greater than 0
  62.         {
  63.             y--; //Decrement y
  64.             p=p-(2*y*rx*rx)+(rx*rx); //Calculate the new decision parameter
  65.         }
  66.         else //If decision parameter is less than 0
  67.         {
  68.             y--; //Decrement y
  69.             x++; //Increment x
  70.             p=p+(2*ry*ry*x)-(2*y*rx*rx)+(rx+rx); //Calculate the new decision parameter
  71.         }
  72.         pixel (xc, yc, x, y);
  73.     }
  74.  
  75.     getch(); //Pauses the Output Console until a key is pressed
  76.     closegraph(); //Closes the graphics mode
  77.     return 0;
  78. }
  79.  
Success #stdin #stdout #stderr 0.13s 45012KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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parse error near line 5 of file /home/D22bo7/prog.octave

  syntax error

>>> //Function to plot the ellipse
    ^

error: source: error sourcing file '/home/D22bo7/prog.octave'
https://ideone.com/OW55ZK
language:
Octave (octave 4.4.1)
created:
1 year ago
visibility:
public

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