#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include "f.h"

int main(void)
{
    double x,res,eps;
    clock_t time;

    printf("x and EPS ");
    if((scanf("%lf",&x)!=1) || scanf("%lf",&eps)!=1)
    {
        fprintf(stderr,"Can not read x or eps\n");
        return ERROR_READ;
    }
    if(eps<0)
    {
        fprintf(stderr,"Incorrect EPS!\n");
        return ERROR_READ;
    }
    time = clock();
    res = fun(x,eps);
    printf("RESULT: %lf\nCalculation error: %lf\nTIME: %lf\n",res,fabs(res - exp(x)),((double)(clock() - time))/CLOCKS_PER_SEC);

    return 0;
}
#include <math.h>
#include "f.h"

double fun(double x, double eps)
{
    int i,flag = 0;
    double res = 1,k = 1;

    if(x<0)
    {
        flag++;
        x *= -1;
    }
    for(i = 1;k>eps;i++)
    {
        k *= x/i;
        res += k;
    }
    if(flag%2 == 1)
        res = 1/res;
    return res;
}
#ifndef F_H
#define F_H

double fun(double x0, double eps);

#define ERROR_READ 1
#endif