animation program in C

Which Compiler are you using..?If Turbo C++..,You have to know little about the functions under graphics.h.

Actually this question has more to do with what OS(unless its, doubtfully, hardware specific).

Just use something like OpenGL or SDL, for graphics.

I think the best graphics for beginners is allegro.I've just completed C,and I'm using it, I recommend you to try.For detail go to http://www.allegro.cc

Dude,,, It's a little harder to understand the graphics functions..

For this you must have the knowledge of the functions defined in graphics.h,,,,,:|

What is with all the Turbo C++ references?!! That compiler is a non-standard relic from another millennial! It's useless!

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
void main()
{
int gdriver=DETECT,gmode;
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
int i=100,j=100,f1=1,f2=1,r=50,k;
l:
// printf("\n\nEnter the co-ordinate where from you want to start to move the circle : ");
// scanf("%d%d",&i,&j);
cleardevice();
// printf("\n\nEnter the redious : " );
// scanf("%d",&r);
// if(r<i||r<j) {printf("\nWrong entry, Try again.");goto l;}
cleardevice();
getch();
while(!kbhit())
{

setcolor(WHITE);
circle(i+1,j+1,r); // printf("%d, %d",i,j);
delay(2);
/* for(k=1;k<=10;k++)
{
setcolor(k);
circle(i+1,j+1,r-(k*r/10));
delay(1);
setcolor(BLACK);
circle(i+1,j+1,r-(k*r/10));
} */
setcolor(BLACK);

circle(i+1,j+1,r);
if(i<639-r&&f1==1)
{i++;f1=1;
}
else
{i--;
if(i==r) f1=1; else f1=-1;
}
if(j<480-r&&f2==1)
{j++;f2=1;}
else
{j--;
if(j==r) f2=1;else f2=-1;
}

}
}








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#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
void main()
{
int gdriver=DETECT,gmode;
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
int i=100,j=100,f1=1,f2=1,r=50,k;
l:
// printf("\n\nEnter the co-ordinate where from you want to start to move the circle : ");
// scanf("%d%d",&i,&j);
cleardevice();
// printf("\n\nEnter the redious : " );
// scanf("%d",&r);
// if(r<i||r<j) {printf("\nWrong entry, Try again.");goto l;}
cleardevice();
getch();
while(!kbhit())
{

setcolor(WHITE);
circle(i+1,j+1,r); // printf("%d, %d",i,j);
delay(2);
/* for(k=1;k<=10;k++)
{
setcolor(k);
circle(i+1,j+1,r-(k*r/10));
delay(1);
setcolor(BLACK);
circle(i+1,j+1,r-(k*r/10));
} */
setcolor(BLACK);

circle(i+1,j+1,r);
if(i<639-r&&f1==1)
{i++;f1=1;
}
else
{i--;
if(i==r) f1=1; else f1=-1;
}
if(j<480-r&&f2==1)
{j++;f2=1;}
else
{j--;
if(j==r) f2=1;else f2=-1;
}

}
}








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Don't use "void main()", there are two proper main function headers, and they are:

int main(int argc, char *argv[]) and int main()

Using "void main()" can cause problems, for a detailed explanation as to what kind of problems it can cause please consult google.

and for your information if you ever want to upgrade to a newer compiler, (like Visual Studio Express, or MinGW) the first thing you should try is using STANDARD C++ headers, like instead of "fstream.h" it should be #include <fstream>