Vezba 10 - Zad. 2

#include <stdio.h>
#include <stdlib.h>

double suma(int n, double x);

int main()
{
    int n;
    double s, x;
    do{
    printf("\nUnesite n: ");
    scanf("%d", &n);
    }while(n<1);
    printf("\nUnesite x: ");
    scanf("%lf", &x);
    s = suma(n, x);
    printf("\nSuma = %.3f", s);
    return 0;
}

double suma(int n, double x)
{
    int i, zbir, znak;
    double s,st;
    s=-x+1;
    znak=1;
    st=x;
    zbir=1;
    for(i=1;i<=n;i++)
    {
        if(i<3) s+=x;
        else
        {
            znak*=-1;
            st*=x;
            zbir+=i-1;
            s+=(i*st*x+znak*zbir)/((i-1)*st+zbir+i);
        }
    }
    return s;
}