ln(x+1)

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


double f(double x,int k);
main()
{
    float x,s=0;
    int k,n;
    printf("nhap vao so x ");
    scanf("%f",&x);
    printf("nhap vao n= ");
    scanf("%d",&n);
    for (k=1;k<=n;k++)

    s+=f(x,k);
    printf("\n gia tri cua bieu thuc %lf",s);

}

double f(double x,int k)
{
    double s=x;

    if(k==0)
    s=x;
    else
    s=pow(x,k)/k;
    k++;
    return s;
}