PROGRAM TO REVERSE A NUMBER IN PROLOG

gurpreet:- write('Enter number'),nl,read(X),Z is X mod 10, X1 is X/10, R is (Z*10)+(X1),write(R),!.

PROGRAM TO REVERSE A NUMBER IN PROLOG

gurpreet:- write('Enter number'),nl,read(X),Z is X mod 10, X1 is X/10, R is (Z*10)+(X1),write(R),!.

PARSER IN PROLOG

% IT WORKS FOR THE PARTICULAR SENTENCE  " The, dog, barked , at ,the,cow" (give it in list).
% you can write in your own facts to implements the rules given by me.

sentence(A,C):-nounphrase(A,B),verbphrase(B,C).
nounphrase(A,C):-article(A,B),noun(B,C).
verbphrase(A,C):-verb(A,B),prepositionphrase(B,C).
prepositionphrase(A,C):-preposition(A,B),nounphrase(B,C).

preposition([at|X],X).
article([a|X],X).
article([the|X],X).
noun([dog|X],X).
noun([cow|X],X).
noun([moon|X],X).
verb([barked|X],X).
verb([wrinked|X],X).

FIBONACCI SERIES IN PROLOG

fibonacci(0,1).
fibonacci(1,1).
fibonacci(A,B) :- A > 1, A1 is A - 1, A2 is A - 2, fibonacci(A1,B1), fibonacciA2,B2), B is B1 + B2.

PROGRAM FOR THE INTERSECTION OF TWO LISTS

int([X|Y],Z,[X|D]):-member(X,Z),int(Y,Z,D).
int([X|Y],Z,D):- \+member(X,Z),int(Y,Z,D).
int([],Z,[]).

TOWER OF HANOI PROLOG IMPLEMENTATION

towerofhanoi(1,X,Y,_):-  write(' move the disk from'),write(X),write('TO') ,write(Y),nl.


towerofhanoi(N,X,Y,Z):- N >1, M is N-1, towerofhanoi(M , X, Z,Y),                                          towerofhanoi(1,X,Y,_),towerofhanoi(M,Z,Y,X).

PROGRAM TO REVERSE THE LIST

reverse_garry([],A,A).
reverse_garry([A|B],Z,W):- reverse_garry(B,[A|Z],W).

PROGRAM TO FIND THE PRODUCT OF ALL THE ELEMENTS IN LIST

   pro([],1).
   pro([H|T],P):- pro(T,HT), P is  H*HT.

PROGRAM TO SEE THE PERMUTATIONS IN LIST ENTERED

 garry(X,[X|R],R).
garry(X,[C|R],[C|S]):- garry(X,R,S).
permu_garry([],[]).
permu_garry(Z,[A|B]):- perm(B,W), garry(A,Z,W).

A PROLOG PROGRAM TO CALCULATE MAXIMUM AND MINIMUM IN LIST

maxlist([A],A).
maxlist([A|LIST],MAX):- maxlist(LIST,MAX0),(A>=MAX0, MAX=A ; A<MAX0, MAX=MAX0).

minlist([A],A).
minlist([A|LIST],MIN):- minlist(LIST,MIN0),(A=<MIN0, MIN=A ; A>MIN0, MIN=MIN0).

PROGRAM TO CALCULATE ELEMENTS IN LIST

callist([],0).
callist([_|T],X):- callist(T,X1), X is X1+1.

PROGRAM TO CALCULATE UNION OF 2 LISTS

gurpreet_union([X|Y],Z,W) :- member(X,Z),  gurpreet_union(Y,Z,W).
gurpreet_union([X|Y],Z,[X|W]) :- \+ member(X,Z), gurpreet_union(Y,Z,W).
gurpreet_union([],Z,Z).

PROGRAM TO PRINT Kth ELEMENT FROM LIST

extractk(X,[X|_],1).
extractk(X,[_|T],K):- K>1,K1 is K-1, extractk(T,X,K1).

PROGRAM TO PRINT NUMBERS IN DESCENDING ORDER

print1(0):-write('0'),!.
print1(X):-write(X),nl,N is X-1,print1(N).

PROGRAM TO ADD 10 ELEMENTS OF LIST

% IT WILL WORK FOR 10 ELEMNTS AND TO MAKE IT WORK FOR ANY NUMBER PLACE A %NUMBER IN PLACE OF 10 WHATR U WANT.
addlist(_,0,0).
addlist([H|T],C,X):-C1 is C-1,addlist(T,C1,X1),X is X1+H.
sum([H|T],X):-addlist([H|T],10,X).

PROGRAM TO ADD 2 NUMBERS IN PROLOG

match(10).
manage:-nl,write('Do u wanna enter another value:'),nl,write('Enter 10 for yes:'),nl,write('Press any key for no:'),read(K),match(K).
add:- write(' *** welcome to program ***'),nl, write('Enter the value of variable1:'),read(X),write('\t\t\t Enter the value of variable2:'),read(Y),Z is X+Y,nl, write( Z), manage.

Program to print 10 numebrs in ASCENDING ORDER

print_my(10):-write(10),!.
print_my(X):-write(X),nl,N is X+1,print_my(N).

PROGRAM TO CALCULATE THE CUBE OF A NUMBER

% START WITH WRITING CUDE ON COMMOND PROMPT
match(10).
manage:-nl,write('Do u wanna enter another value:'),nl,write('Enter 10 for yes:'),nl,write('Press any key for no:'),read(K),match(K).
cube:- write(' *** welcome to program ***'),nl, write('Enter the value of variable1:'),read(X),Z is X**3,nl, write( Z), manage,cube.

PROGRAM TO SEE THE GREATEST COMMON DIVISIOR (GCD)

gcd(A, 0, A).
gcd(A, B, D) :- (A>B),(B>0),R is A mod B,gcd(B,R,D).
gcd(A, B, D) :- (A<B), gcd(B,A,D).

PROGRAM TO Check a number is PRIME OR NOT

div(X,A):- N is A*A , N=<X, X mod A =:=0.
div(X,A):- A<X, A1 is A+1,div(X,A1).
check_prime(X):- A is 2, X>1, \+div(X,A).

PROGRAM TO CALCULATE FACTORIAL OF A NUMBER

fact(0,1).
fact(P,Q):-P1 is P-1,fact(P1,Z), Q is Z*P.

2D TRANSFORAMTIONS (TRANSLATION,SHEARING,ROTATION,SCALING) ---- MODIFIED CHECK IT .........

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

void translating_line();
void translating_rectangle();
void scaling();


void rotation_line();
void rotation_rectangle();
void shearing();
int main()
{
   int choice;
   int gd=DETECT ,gm;
   initgraph(&gd,&gm," ");
   initwindow(1500,700);
   while(1)
   {
    printf("\n\n\t\t\t Enter Into Main Menu");
   printf("\n\n\t\t 1. For Translating A Line\n\t\t 2.For Translating A rectangle\n\t\t 3.For Scaling in x and y \n\t\t 4.For Rotating A Line\n\t\t 5.For Rotating a RECTangle\n\t\t6. Shearing\n\t\t  Enter Your Choice:");
   scanf("%d",&choice);
   switch(choice)
   {
      case 1:
           translating_line();
        break;
      case 2:
           translating_rectangle();
      break;
      case 3:
           scaling();
      break;
   
     
      case 4:
           rotation_line();
      break;
      case 5:
           rotation_rectangle();
      break;
      case 6:
           shearing();
      break;
      default:
              printf("\n\n ***** Invalid choice *****");
      break;
      }
    }
      getch();
      closegraph();
      return 0;
 
 
}
void translating_line()
{
  int x1,y1,x2,y2,tx,ty,xn,yn,xn1,yn1,choice1;
  printf("\n\n Enter x1:");
  scanf("%d",&x1);
  printf("\n\n Enter y1:");
  scanf("%d",&y1);
  printf("\n\n Enter x2:");
  scanf("%d",&x2);
  printf("\n\n Enter y2:");
  scanf("%d",&y2);
  outtextxy(1000,200,"ORIGINAL LINE");
  line(x1,y1,x2,y2);
 // getch();
 // cleardevice();

  printf("\n\n  Do u want to translate \n 1.for yes \n anything for no");
  scanf("%d",&choice1);
  if(choice1==1)
  {
    printf("\n\n --------------- Enter translation coordinates ---------");
    printf("\n\n Enter tx:");
    scanf("%d",&tx);
    printf("\n\n Enter ty:");
    scanf("%d",&ty);
    xn=x1+tx;
    yn=y1+ty;
    xn1=x2+tx;
    yn1=y2+ty;
   // getch();
   cleardevice();
  
     outtextxy(1000,200,"AFTER TRANSLATION LINE");
     line(xn,yn,xn1,yn1);
  }
  else
  {
    printf("\n\n ****** Your choice sir ji *****");
  }
 }
 void translating_rectangle()
 {
    int x1,y1,x2,y2,tx,ty,xn,yn,xn1,yn1,choice1;
  printf("\n\n Enter x1:");
  scanf("%d",&x1);
  printf("\n\n Enter y1:");
  scanf("%d",&y1);
  printf("\n\n Enter x2:");
  scanf("%d",&x2);
  printf("\n\n Enter y2:");
  scanf("%d",&y2);
  outtextxy(1000,200,"ORIGINAL RECTANGLE");
  rectangle(x1,y1,x2,y2);
 // getch();
 // cleardevice();
  printf("\n\n Do u want to translate \n 1.for yes \n anything for no");
  scanf("%d",&choice1);
  if(choice1==1)
  {
    printf("\n\n --------------- Enter translation coordinates ---------");
    printf("\n\n Enter tx:");
    scanf("%d",&tx);
    printf("\n\n Enter ty:");
    scanf("%d",&ty);
    xn=x1+tx;
    yn=y1+ty;
    xn1=x2+tx;
    yn1=y2+ty;
   // getch();
   cleardevice();
  
     outtextxy(1000,200,"AFTER TRANSLATION LINE");
     rectangle(xn,yn,xn1,yn1);
  }
  else
  {
    printf("\n\n ****** Your choice sir ji *****");
  }
  }
 void scaling()
 {

    int sx,sy,choice;
    int xmin,xmax,ymin,ymax,xmid,ymid;
    printf("\n\n\t\t Enter rectangle or square coordinates:");
    printf("\n\n Enter xmin:");
    scanf("%d",&xmin);
       printf("\n\n Enter ymin:");
    scanf("%d",&ymin);
       printf("\n\n Enter xmax:");
    scanf("%d",&xmax);
       printf("\n\n Enter ymax:");
    scanf("%d",&ymax);
    line(xmin,ymin,xmax,ymin);
    line(xmin,ymin,xmin,ymax);
    line(xmin,ymax,xmax,ymax);
    line(xmax,ymin,xmax,ymax);
    xmid=xmin+xmax/2;
    ymid=ymin+ymax/2;
  
    getche();
    xmin=xmin-xmid;
    xmax=xmax-xmid;
    ymin=ymin-ymid;
    ymax=ymax-ymid;
  
    line(xmin,ymin,xmax,ymin);
    line(xmin,ymin,xmin,ymax);
    line(xmin,ymax,xmax,ymax);
    line(xmax,ymin,xmax,ymax);
  
    printf("\n\n 1 for scaling in x and y");
    scanf("%d",&choice);
    if(choice==1)
    {
                printf("\n Enter sx:");
                 scanf("%d",&sx);
                  printf("\n Enter sy:");
                 scanf("%d",&sy);
     xmin=xmin*sx;
     xmax=xmax*sx;
    ymin=ymin*sy;
    ymax=ymax*sy;
     }
     outtextxy(300,200,"AFTER SCALING");
     xmin=xmin+xmid;
    xmax=xmax+xmid;
    ymin=ymin+ymid;
    ymax=ymax+ymid;
    cleardevice();
    line(xmin,ymin,xmax,ymin);
    line(xmin,ymin,xmin,ymax);
    line(xmin,ymax,xmax,ymax);
    line(xmax,ymin,xmax,ymax);
  
  }

   
void rotation_rectangle()
{
   float my;
   int x1,y1,x2,y2,x3,y3,x4,y4;
 
   int tempx1,tempx2,tempx3,tempx4,tempy1,tempy2,tempy3,tempy4,tempx,tempy;
//   int temp,temp1;
   printf("\n\n ----Enter Rectanlge Coordinates----");
   printf("\n\n Enter x1:");
   scanf("%d",&x1);
   printf("\n\n Enter y1:");
   scanf("%d",&y1);
   printf("\n\n Enter x2:");
   scanf("%d",&x2);
   printf("\n\n Enter y2:");
   scanf("%d",&y2);
   outtextxy(800,200,"RECTANGLE");
   rectangle(x1,y1,x2,y2);
   printf("\n\n Enter the Rotation Angle:");
   scanf("%f",&my);

   tempx=x1;  // i have made fixed point as x1 and y1  you can make fixed acc to your choice
   tempy=y1;
   //x3=x2;
   //y3=y2;
   //x4=x1;
   //y4=y2;
 
   my= my*(3.14/180);
   //printf("\n\n%d",my);
 
 
   tempx1=tempx+((x1-tempx)*cos(my)) - ((y1-tempy)*sin(my));
   tempy1=tempy+((x1-tempx)*sin(my)) + ((y1-tempy)*cos(my));
   tempx2=tempx+((x2-tempx)*cos(my)) - ((y1-tempy)*sin(my));
   tempy2=tempy+((x2-tempx)*sin(my)) + ((y1-tempy)*cos(my));
   tempx3=tempx+((x2-tempx)*cos(my)) - ((y2-tempy)*sin(my));
   tempy3=tempy+((x2-tempx)*sin(my)) + ((y2-tempy)*cos(my));
   tempx4=tempx+((x1-tempx)*cos(my)) - ((y2-tempy)*sin(my));
   tempy4=tempy+((x1-tempx)*sin(my)) +((y2-tempy)*cos(my));
 

   line(tempx1,tempy1,tempx2,tempy2);
  // getch();
   line(tempx2,tempy2,tempx3,tempy3);
   //getch();
   line(tempx3,tempy3,tempx4,tempy4);//getch();
  line(tempx4,tempy4,tempx1,tempy1);
 }
 void rotation_line()
 {
   float my;
   int x1,y1,x2,y2,x3,y3,x4,y4;
 
   int tempx1,tempx2,tempx3,tempx4,tempy1,tempy2,tempy3,tempy4,tempx,tempy;
//   int temp,temp1;
   printf("\n\n ----Enter line Coordinates----");
   printf("\n\n Enter x1:");
   scanf("%d",&x1);
   printf("\n\n Enter y1:");
   scanf("%d",&y1);
   printf("\n\n Enter x2:");
   scanf("%d",&x2);
   printf("\n\n Enter y2:");
   scanf("%d",&y2);
   outtextxy(800,200,"LINE");
   line(x1,y1,x2,y2);
   printf("\n\n Enter the Rotation Angle:");
   scanf("%f",&my);

   // rotating about the point x1 and y1
   tempx=x1;
   tempy=y1;
 
 
   my= my*(3.14/180);
   printf("\n\n%f",my);// my=angle
   tempx1=tempx+((x1-tempx)*cos(my)) - ((y1-tempy)*sin(my));
   tempy1=tempy+((x1-tempx)*sin(my)) + ((y1-tempy)*cos(my));
   tempx2=tempx+((x2-tempx)*cos(my)) - ((y1-tempy)*sin(my));
   tempy2=tempy+((x2-tempx)*sin(my)) + ((y1-tempy)*cos(my));
   tempx3=tempx+((x2-tempx)*cos(my)) - ((y2-tempy)*sin(my));
   tempy3=tempy+((x2-tempx)*sin(my)) + ((y2-tempy)*cos(my));
   //tempx4=tempy+((x1-tempx)*cos(my)) - ((y2-tempy)*sin(my));
   //tempy4=tempy+((x1-tempx)*sin(my)) +((y2-tempy)*cos(my));
 

   line(tempx1,tempy1,tempx2,tempy2);
  // getch();
   line(tempx2,tempy2,tempx3,tempy3);
   //getch();
   //line(tempx3,tempy3,tempx4,tempy4);//getch();
  //line(tempx4,tempy4,tempx1,tempy1);
}



void shearing()
{

    int xa,ya,xb,yb,shx,choice,shy;
 
   settextstyle(8,HORIZ_DIR,8);
   cleardevice();
   outtextxy(300,300," EVALUATION");
getche();
cleardevice();
printf("\n\n Enter xa:");
scanf("%d",&xa);
printf("\n\n Enter ya:");
scanf("%d",&ya);
printf("\n\n Enter xb:");
scanf("%d",&xb);
printf("\n\n Enter yb:");
scanf("%d",&yb);
rectangle(xa,ya,xb,yb);
printf("\n\t\t 1.For shearing in X direction\n\t\t 2.For Shearing In Y Direction\n\t\t Enter Your Choice:");
scanf("%d",&choice);
cleardevice();
if(choice==1)
{
  printf("\n\n Enter shearing in x:");
  scanf("%d",&shx);
  outtextxy(600,200,"After Shearing");
  line(xa,ya,xb,ya);
  line(xa,ya,xa+shx,yb);
  line(xb,ya,xb+shx,yb);
  line(xa+shx,yb,xb+shx,yb);
}
else if (choice==2)
{
 printf("\n\n Enter shearing in y:");
  scanf("%d",&shy);
  outtextxy(800,200,"After Shearing");
  line(xa,ya,xb,ya+shy);
  line(xa,ya,xa,yb);
  line(xb,ya+shy,xb,yb+shy);
  line(xa,yb,xb,yb+shy);
}
else
{
  printf(" **** invalid choice ****");
}
 }

LINE CLIPPING COHEN SUTHERLAND ( not complete !!!)

/***** IT TELLS UPTO THE REGION CODES AND IDENTIFIES THE POINTS TO BE CLIPPED ****/

int main()
{
    int bit[4],bit1[4],temp[4];
    char str[4],str1[4],str2[4];int i;
    char temp5[4]={0000};
    int choice3,choice4;
    int check=0,choice1,choice2;
        int x1,y1,x2,y2,xmin,ymin,xmax,ymax;
   int gd=DETECT,gm;
   initgraph(&gd,&gm," ");
   printf("\n\n\t\t --------------CAUTION --------------");
   printf("\n\t\t *FINALLY CLIPPING REQUIRED MEANS*  WE HAVE TO\n\t\t\t DO CLIPPING FOR THAT POINT --\n\n");
   printf("\n\n\t\t **** Enter Line Cooridnates ****");
   printf("\n\n Enter x1:");
   scanf("%d",&x1);
    printf("\n\n Enter y1:");
   scanf("%d",&y1);
    printf("\n\n Enter x2:");
   scanf("%d",&x2);
    printf("\n\n Enter y2:");
   scanf("%d",&y2);
    printf("\n\n\t\t **** Enter window coordinates ****");
    printf("\n\n Enter xmin:");
   scanf("%d",&xmin);
    printf("\n\n Enter ymin:");
   scanf("%d",&ymin);
    printf("\n\n Enter xmax:");
   scanf("%d",&xmax);
    printf("\n\n Enter ymax:");
   scanf("%d",&ymax);
   outtextxy(700,200,"ORIGINAL LINE");
   line(x1,y1,x2,y2);
   outtextxy(700,200,"ORIGINAL LINE");
   rectangle(xmin,ymin,xmax,ymax);
   if((x1 &&x2)>xmax  || ((x1 && x2)<xmin))
   {
       if((y1 &&y2)>ymax  || ((y1 && y2)<ymin))
    
           printf("\n\n do clipping");
  
  
   bit[0]= ymax-y1;
   printf("\n\n%d",bit[0]);
   if(bit[0]<0)
   {
     bit[0]=1; }
   else
   {
     bit[0]=0;
   }
   bit[1]= y1-ymin;
    printf("\n\n%d",bit[1]);
    if(bit[1]<0)
   {
     bit[1]=1; }
   else
   {
     bit[1]=0;
   }
    bit[2]=xmax-x1;
     printf("\n\n%d",bit[2]);
     if(bit[2]<0)
   {
     bit[2]=1; }
   else
   {
     bit[2]=0;
   }
    bit[3]=x1-xmin;
     printf("\n\n%d",bit[3]);
     if(bit[3]<0)
   {
     bit[3]=1; }
   else
   {
     bit[3]=0;
   }
   
   
    bit1[0]=ymax-y2;
     printf("\n\n%d",bit[0]);
     if(bit1[0]<0)
   {
     bit1[0]=1; }
   else
   {
     bit1[0]=0;
   }
    bit1[1]=y2-ymin;
     printf("\n\n%d",bit1[1]);
     if(bit1[1]<0)
   {
     bit1[1]=1; }
   else
   {
     bit1[1]=0;
   }
    bit1[2]=xmax-x2;
     printf("\n\n%d",bit1[2]);
     if(bit1[2]<0)
   {
     bit1[2]=1; }
   else
   {
     bit1[2]=0;
   }
    bit1[3]=x2-xmin;
     printf("\n\n%d",bit1[3]);
    if(bit1[3]<0)
   {
     bit1[3]=1; }
   else
   {
     bit1[3]=0;
   }
  // int str[4];
   for(i=0;i<4;i++)
   {
      str[i]=0;
   }
   printf("\n\n\t\t ----- Region codes for point 1 -------\n\n");
   for(i=0;i<4;i++)
   {
     str[i]=bit[i];
     printf("\nregion code for point1 bit[%d]= %d",i,str[i]);
    }
   //  int str1[4];
   for(i=0;i<4;i++)
   {
    if( str[i]!=temp5[i])
    {
      check=1;
      printf("\n\n  FINally clipping required");
      choice1=1;
       choice3=1;
    }
   
    else
    {
      printf("\n\n no clipping required");
    } 
    }
  
  
  
  
   for(i=0;i<4;i++)
   {
      str1[i]=0;
   }
      printf("\n\n\t\t ----- Region codes for point 2 -------\n\n");
    
   for(i=0;i<4;i++)
   {
     str1[i]=bit1[i];
     printf("\n region code for point2 (bit[%d])=%d",i, str1[i]);
    }
    // int str2[4];
 for(i=0;i<4;i++)
   {
    if( str1[i]!=temp5[i])
    {
        check=1;
      printf("\n\n  clipping required");
      choice2=1;
     choice4=1;
    }
    else
    {
      printf("\n\n no clipping required");
      //goto x1;
    } 
    }   
        
   }
   else
   {
      printf("\n\n\n no clipping is required");
   }
   getch();
  closegraph();
  return 0;  
}

CIRCLE PROGRAM USING BRESENHAMS METHOD (GRAPHICS)

#include<graphics.h>

#include<stdio.h>

#include<conio.h>

void plotcircle(int,int,int,int);

void main()

{

   int gd = DETECT, gm;

   int xc,yc,x,y,r,d;

   initgraph(&gd, &gm, "");

  

   printf("\n Enter the values\n xc:\nyc:\nr:\n");

   scanf("%d%d%d",&xc,&yc,&r);

   x=0;

   y=r;

   d=3-(2*r);

   plotcircle(xc,yc,x,y);

   while(x<y)

    {

    if(d<0)

      {

               x=x+1;

               d=d+(4*x)+6;

              }

   else

      {

                x=x+1;

                y=y-1;

                d=d+(4*(x-y))+10;

      }

            plotcircle(xc,yc,x,y);

       }

  getch();

  }

void plotcircle(int xc,int yc,int x,int y)

                {

                putpixel(xc+x,yc+y,2);

                putpixel(xc-x,yc+y,2);

                putpixel(xc+x,yc-y,2);

                putpixel(xc+y,yc+x,2);

                putpixel(xc-y,yc-x,2);

                putpixel(xc-y,yc+x,2);

                putpixel(xc+y,yc-x,2);

                putpixel(xc-x,yc-y,2);

                }

CIRCLE PROGRAM USING TRIGONOMETRIC METHOD (GRAPHICS)

#include<graphics.h>

#include<stdio.h>

#include<conio.h>

#include<math.h>

void plotcircle(int,int,int,int);

void main()

{

   int gd = DETECT, gm;

   int xc,yc,x,y,c,s,r,d,temp;

   initgraph(&gd, &gm, "");

  

   printf("\n Enter the values xc: \nyc:\nr:\n");

   scanf("%d%d%d",&xc,&yc,&r);

   x=0;

   y=r;

   d=1/r;

   c=cos(d);

   s=sin(d);

   plotcircle(xc,yc,x,y);

   while(x<=y)

     {

                plotcircle(xc,yc,x,y);

               temp=x;

               x=((x*c)-(y*s));

               y=((y*c)+(temp*s));

      }

  getch();

  }

void plotcircle(int xc,int yc,int x,int y)

                {

                putpixel(xc+x,yc+y,2);

                putpixel(xc-x,yc+y,2);

                putpixel(xc+x,yc-y,2);

                putpixel(xc+y,yc+x,2);

                putpixel(xc-y,yc-x,2);

                putpixel(xc-y,yc+x,2);

                putpixel(xc+y,yc-x,2);

                putpixel(xc-x,yc-y,2);

                }

Circle using polynomial method

#include<graphics.h>

#include<stdio.h>

#include<conio.h>

#include<math.h>

void plotcircle(int,int,int,int);

void main()

{

   int gd = DETECT, gm;;

   int xc,yc,x,y,xend,r,d;

   initgraph(&gd, &gm, "");

  

 printf("\n\n Enter xc:");
  scanf("%d",&xc);
  printf("\n\n Enter yc:");
  scanf("%d",&yc);
  printf("\n\n Enter r:");
  scanf("%d",&r);

   x=0;

   xend=r/sqrt(2);

   plotcircle(xc,yc,x,y);

   while(x<xend)

     {

               x=x+1;

               y=sqrt((r*r)-(x*x));

              plotcircle(xc,yc,x,y);

      }

  getch();

  }

void plotcircle(int xc,int yc,int x,int y)

                {

                putpixel(xc+x,yc+y,2);

                putpixel(xc-x,yc+y,2);

                putpixel(xc+x,yc-y,2);

                putpixel(xc+y,yc+x,2);

                putpixel(xc-y,yc-x,2);

                putpixel(xc-y,yc+x,2);

                putpixel(xc+y,yc-x,2);

                putpixel(xc-x,yc-y,2);

               }