lab7extra

#include <stdio.h>
#include <math.h>
#define N 10

double exponential(double x, int y){
    double number = 1;
    int i;

    for(i = 1; i<=y; i++){
        number *= x;
    }
    return number;
}

double expression(double x, int n){
    double num,den;
    num = exponential((x-1)/(x+1), (2*n)-1);
    den = (2*n) - 1;
    return (num/den);
}

double sum(double x, int n){
    int i;
    double suma = 0;

    for(i=1; i<=n; i++){
        suma += expression(x,i);
    }
    return 2*suma;
}

int main(int argc, char* argv[]){
    double x;

    do{
        printf("Enter x: ");
        scanf("%lf", &x);
        if(x<=0 || x > 6){
            printf("Invalid value!\n");
        }
    }while(x<= 0 || x > 6);

    printf("\nseries ln(%.3lf): %.15lf", x, sum(x,N));
    printf("\nmath ln(%.3lf): %.15lf\n", x, log(x));

    return 0;
}