Simple Swapping Card’s game with C Graphics!

#include "stdio.h"

#include "graphics.h"

#include "stdlib.h"

#include "math.h"

#include "time.h"

#define BREADTH 30          //Breadth of card

#define HEIGHT 40                       //Height of card

int xco[4]={0,50,200,350},r=75,x,pos,SPEED=14;

void swap(int a,int b,int c,int t)  //Function to rotate cards

{

    int y1,y2;

    cleardevice();

    if(pos==a)                      //Change answer position

        pos=b;

    else if(pos==b)

        pos=a;

    for(x=xco[a];x<=xco[b];x++)     //Rotate on circumference

    {

        cleardevice();

        y1=200+sqrt((r*r)-((x-xco[a]-r)*(x-xco[a]-r)));

        y2=200-sqrt((r*r)-((x-xco[a]-r)*(x-xco[a]-r)));

        rectangle(xco[c],200,xco[c]+BREADTH,200+HEIGHT);

        if(t==1)        //Anti-clockwise rotation

        {

            rectangle(x,y1,x+BREADTH,y1+HEIGHT);

            rectangle(xco[b]+xco[a]-x,y2,xco[b]+xco[a]-x+BREADTH,y2+HEIGHT);

        }

        else                    //Clockwise rotation

        {

            rectangle(x,y2,x+BREADTH,y2+HEIGHT);

            rectangle(xco[b]+xco[a]-x,y1,xco[b]+xco[a]-x+BREADTH,y1+HEIGHT);

        }

        delay(SPEED);           //Delay depending on SPEED

    }

}

void start()                //For starting animation

{

    int i;

    char str[2];

    cleardevice();

    for(i=1;i<=3;i++)               //Draw three cards & number them 1, 2 & 3

    {

        rectangle(xco[i],200,xco[i]+BREADTH,200+HEIGHT);

        sprintf(str,"%c",i+48);

        outtextxy(xco[i]+BREADTH/2,200+HEIGHT+20,str);

    }

    for(i=0;i<10;i++)               //Indicate start card

    {

        setfillstyle(SOLID_FILL,3+i);

        floodfill(xco[pos]+15,200+15,15);

        delay(250);

    }

}

int main()

{

    int gd,gm,a,b,c,t,i;

    randomize();

    detectgraph(&gd,&gm);

    initgraph(&gd,&gm,"c:\\tc\\bgi");

    cleardevice();

    setcolor(15);

    settextstyle(DEFAULT_FONT,HORIZ_DIR,2);

    pos=rand()%3+1;                 //Initialize start card positoon randomly

    start();

    for(i=0;i<30;i++)

        {

                a=rand()%2+1;           //Choose random pair of cards for swap

                b=(a==1)?2:3;           //either (1,2) or (2,3)

                c=(a==1)?3:1;

                t=rand()%2;             //Randomize t:Indicates anticlockwise/clockwise rotation

                swap(a,b,c,t);

                if(SPEED>3)

                      SPEED--;        //Increase speed i.e. decrease delay time

        }

    printf("\n\n\t\tPosition of the Card ? (1, 2 or 3)\n\t\t");

    scanf("%d",&t);

    if(t==pos)          //Check if right/wrong

        printf("\n\n\t\tCorrect!!!");

    else

        printf("\n\n\t\tWrong!!!");

    getch();

    return 1;

}