Implementation of round robin

Lab#3

#include <vcl.h>      // Visual Component Library
#include <stdio.h>    // standard input/output header
#include <conio.h>    //console input-output
#include <math.h>     //mathematics
#include <stdlib.h>   //standard library
#pragma hdrstop
//---------------------------------------------------------------------------
#pragma argsused
int main(int argc, char* argv[])
{
        double a,b,x,h,r,s,f,razn;
        int k,sign,n,count;
        do {
                clrscr();
                fflush(stdin);
                printf(" 1 - Example, others digits -your's inp\n");
                scanf("%d",&sign);
                if (sign==1) {
                        a=0.1; b=1.0; h=0.1;
                        n=10;
                }
                else {
                        do {
                                printf("print a,b,h,n\n");
                                fflush(stdin);
                        } while(scanf("%lf%lf%lf%d",&a,&b,&h,&n) != 4);


                 }
                for (x=a; x<=b; x+=h)  {                                
                        r=1;
                        s=0;
                        for (k=1; k<=n; k++)  {
                                r=-r*4*x*x/((2*k-1)*2*k);
                                s+=r;

                        }
                        f=2*(cos(x)*cos(x)-1);
                        razn=fabs(f-s);
                        printf(" x = %lf, s = %lf\, f= %lf, razn= %lf \n",x,s,f,razn);
                }

        
        puts("Exit - 1, Restart - any key");
        } while ( getch() != '1');


}