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

float series(float x, float eps){
    int n = 1;
    float sum = 0, k;
    k = 1 / (3 * x);

    while (fabs(k) > eps) {
        if (x == 0) {
            return sum;
        }

        sum =+ k;
        k = k * ((2 * n - 3)) / ((2 * n * (2 * n + 1) * x));
        n++;
    }

    return sum;
}

int main()

{
    float A, B;
    float r;
    float eps;
    float x, Fx;

    printf("\t Input initial value interval A= ");
    scanf("%f", &A);

    printf("\n\t Input initial value interval B= ");
    scanf("%f", &B);

    while (B <= A) {
    printf("\nInitial value of limit (A) have to be less final value (B)");

    printf("\n\t Input initial value interval A= ");
    scanf("%f", &A);

    printf("\n\t Input initial value interval B= ");
    scanf("%f", &B);
    }

    printf("\n\t Input step r= ");
    scanf("%f", &r);

    while (r <= 0 || r >= (B - A)) {
        printf("\n Step tabulation have to be more than zero and less interval from A to B(%.f)\n",fabs(B - A));
        printf("\n\t Input initial value step r= ");
        scanf("%f",&r);
    }

    printf("\n\t Input accesable infelicity eps= ");
    scanf("%f", &eps);

    while ((eps >= 1) || (eps <= 0)) {
        printf("\n\t Accesable infelicity (eps) have to be more than zero and less than unit");
          printf("\n\t Input initial value eps= ");
        scanf("%f",&eps);
    }

    printf("\n\t\t\t    Table"
           "\n\t\t+---------+------------------+"
           "\n\t\t|    X    |        F(X)      |"
           "\n\t\t+---------+------------------+");
     x = A;
    while (x <= B) {
        Fx = series(x, eps);
        printf("\n\t\t|  %5.2f  |     %7.4f      |",x , Fx);
        x=x+r;
    }
    printf("\n\t\t+---------+------------------+");
}