Thread: problem with functions & for loop !

Hi
I'm trying to write a code that will a print a table of results
the values of first column are known so I put them using for loop
then i tried calling functions inside the loop to calculate the value fot the other columns
the problem is that the third function depends on the value of the first & second functions but the values can not be sent there !
here is the code

Code:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define PI 3.141592653589793238462
 
void get_values(double *, double*);
void get_capacitance(double*, int, double);
void get_inductance(double*, int, double);
void get_attenuation(double,int, double, double);
void get_attdb(double);
 
int main(void)
{
   double inductor, capacitor;
   int F;
   double capacitance, inductance, attenuation, attdb;
 
        
   get_values(&inductor, &capacitor);
  
   printf("L = %lf, C = %lf\n", inductor, capacitor);
  
   for (F=100;F<=1000;F=F+100)
   {
       printf("%i",F);
       printf("\t");
      
       get_capacitance(&capacitance,F,capacitor);
       printf("%lf", capacitance);
       printf("\t");
      
       get_inductance(&inductance,F,inductor);
       printf("%lf", inductance);
       printf("\t");
      
       get_attenuation(attenuation,F, inductance, capacitance);
       printf("%lf", attenuation);
       printf("\t");
      
       get_attdb(attenuation);
       printf("\t");
      
       printf("\n");
   }   
   system("PAUSE");
   return 0;
}
 
 
void get_values(double *L, double *C)
{
   printf( "Please, enter the required inductor value");
   scanf("%lf", L);
        
   printf("Please, enter the required capacitor value");
   scanf("%lf", C);         
}
 
 
void get_capacitance(double *capacitance, int frequency, double C)
{
    *capacitance =(((1/(2 * PI * frequency * C))));
   
}
 
void get_inductance(double *inductance, int frequency, double L)
{
    *inductance = (2 * PI * frequency * L);
}
 
void get_attenuation(double attenuation,int F, double L, double C)
{
     attenuation = (1/(1-(2*PI*F*2*PI*F*L*C)));
 
}
 
void get_attdb(double att)
{
     printf("%lf",(20 * log10(att)));
 
}

thanks in advance