int и double

//---------------------------------------------------------------------------
 
#include "math.h"
#include <stdio.h>
#include <conio.h>
#include <vcl.h>
#pragma hdrstop
 
 
//---------------------------------------------------------------------------
 
#pragma argsused
typedef double (*d1)(double,double);
typedef double (*d2)(double);
double s(double,double);
double y(double);
void Out_Rez (double(*)(double) ,double(*)(double,double),double,double,double,double);
 
 
 
 
void main()
{
double a,b,h,n;
puts("Input a,b,h,n");
scanf("%lf%lf%lf%lf", &a, &b, &h, &n);
puts("\n\t Rezalt \n");
Out_Rez (y,s,a,b,h,n);
puts("\n Press any key ... ");
getch();
}
 
double y( double x){
return(pow(x,2)/4.+x/2.+1.)*exp(x/2.);
}
double s(double x,double n) {
double k=1;
double s=1;
double kf=1;
while (k<n)
{
s+=(pow(k,2.)+1)*(pow((x/2.),k))/(kf*=k++);
}
return (s);
}
void Out_Rez (d2 y,d1 s,double a,double b,double h,double n) {
for(double x=a; x<=b; x+=h)
printf(" a = %5.2lf, b = %8.4lf,x = %8.6lf, h = %5.4lf, n = %5.5lf\n Y(x) = %8.6lf, S(x) = %8.6lf, |Y(x)-S(x)| = %8.6lf \n\n\n\n\n",a,b,x,h,n,s(x,n),y(x),fabs(y(x)-s(x,n)));
}

printf(" a = %5.2lf, b = %8.4lf,x = %8.6lf, h = %5.4lf, n = %5.5lf\n Y(x) = %8.6lf, S(x) = %8.6lf, |Y(x)-S(x)| = %8.6lf \n\n\n\n\n",a,b,x,h,n,s(x,n),y(x),fabs(y(x)-s(x,n)));