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






main()
{


float x=1.,y,z,;
int n,i=0;




do{
scanf("%d",&n);
fflush(stdi n);
}while(n<1);


printf ("Die Anzahl der n-Werte: %d",n);




for (i=1; i<n 1. ; i )
{


x=x*(((2.*i)*(2.*i))/((2.*i-1.)*(2. *i 1.)));
printf("x%d",i);
printf(" = %f\n", x*2);
}


while(i<n)
{
i ;
x=x*(((2.*i)*(2.*i))/((2.*i-1.)*(2.*i 1.)));
printf("x%d",i);
printf(" = %f\n", x*2);
}


printf("\nDas Produkt ist: %f\n\n", x*2);
y=4*atan(1);
printf("Der ArcTan ist: %f\n\n", y);
z=y-x;
printf("Die Differenz ist: %f\n\n", z);
system("pause";
return 0;
}