고수 형들 괜히 귀찮게 하지 말고 나와 같은 중하수들에게 묻슴다

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

double getnextcurrent(double i);
double getnextvoltage(double v,double i1, double i2);
double Vdd = 5.0;
double R = 1000.0;
double n = 1.0;
double V_temp = 0.0252;

int main(void)
{
 double first_voltage = 0.7;
 double first_current = 0.001;
 double next_voltage = 0.0;
 double next_current = 0.0;
 double comparision = 0.0;

 for( ;comparision < 0.0001 ; )
 {
  getnextcurrent(first_voltage);
  next_current = getnextcurrent(first_voltage);
  getnextvoltage(first_voltage, first_current, next_current);
  next_voltage = getnextvoltage(first_voltage, first_current, next_current);
  comparision = next_voltage - first_voltage;
  first_voltage = next_voltage;
  first_current = next_current;

 }
 printf("C를 이용한 newton method 결과\\nVd : %l\\nId : %l", next_voltage, next_current);
 return 0;
}

double getnextcurrent(double first_voltage)
{
 double i;
 i = (Vdd-first_voltage)/R;
 return i;
}

double getnextvoltage(double v, double i1, double i2)
{
 double V2;
 V2 = v + 2.3*(V_temp)*n*( log(i2) - log(i1) );
 return V2;
}
 
//I2 = (VDD - V1)/R
// V2 = V1 + 0.1 log(I2/I1)
// I3 = (VDD - V2)/R
// V3 = V2 + 0.1 log(I3/I2)

어디가 틀렸찌..?

LNK1120오류 떴는데 어디서 실수했는지 못찾겠음