I am working on this function where I have to take two arrays and perform a func

Question

I am working on this function where I have to take two arrays and perform a function with the results going into a third array.

This is a short version of what I have.

#include <iostream>  //pre-processor directs - iostream talks to screen
#include <fstream>   //pre-processor directs - allows accessing and inputing to data files
#include <string>    //pre-processor directs - enables string class functions
#include <cmath>  //pre-processor directs - allows math functions

const int size=30;

using namespace std;  //introduces namespace std

void velcFts (double, double, double);

int main ()

{
    int i=0;
    string filename;
    ifstream inFile;
    string car, date, driver;
    double time[size], dist[size], velcf[size];
    
    inFile.open("CAR1a.txt");
    
    if (!inFile.good())
       {
         cout<<"Could not open file"<<endl;
         system ("pause");
         return 1;
         }

   while (!inFile.eof()) //Reads the rest of the file into arrays time[i] and dist[i]
        {
         inFile>>time[i]>>dist[i];
         
         velcFts (time[size], dist[size], velcf[size]);
         
         cout<<time[i]<<", "<<dist[i]<<", "<<velcf[i]<<","<<endl;
         i++;
         }

inFile.close();
system("pause");
return 0;
}
//******************Velocity (ft/s) function definition*************************
void velcFts (double time[size], double dist[size], double velcf[size])
{
       for (int i=0;i<=size;i++)     //initiates, defines and sets counter
       {
       velcf[i] = (dist[i+1]-dist[i])/(time[i+1]-time[i]);
       }
}

When I try to run the program i get the following error- [Linker error] undefined reference to 'velcFts(double, double, double)' and Id returned 1 exit status

What am I doing wrong here.  I know that it is probibly something simple that I am overlooking.  Help with an explination would be greatly appreciated.

Explanation / Answer

Your prototype is conflicting your function.
void velcFts (double, double, double);

asks for 3 doubles however in your function

void velcFts (double time[size], double dist[size], double velcf[size])
{
for (int i=0;i<=size;i++) //initiates, defines and sets counter
{
velcf[i] = (dist[i+1]-dist[i])/(time[i+1]-time[i]);
}
}

It ends up asking for double arrays.

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