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

float factorial(float x);
float func(float fact_value);
int is_equal(float val1, float val2, float eps);

int main()
{
    float eps;
    float sum=0, i=1;
    printf("Enter epsilon: ");
    scanf("%f", &eps);
    printf("%f \n", func(5)-func(2));
    while (fabs(func(i)-func(i-1))<= eps)
    {
        sum+=func(i);
        i++;
    }
    printf("Total sum is %f ", sum);
    getch();
    return 0;
}

float factorial(float n)
{
    if (n == 0 || n == 1) return 1;
    return (n * factorial(n - 1));
}

float func(float x)
{
    return 1 /factorial(x);
}

int is_equal(float val1, float val2, float eps)
{
    int result;
    result = fabs(val1 - val2) < eps;
    return result;
}