What is causing my undefined reference error for ComputeAvg()?

[Teh]

What is wrong with my program. I am so close!
Define stubs for the functions called by the below main(). Each stub should print "FIXME: Finish FunctionName()" followed by a newline, and should return -1. Example output:

FIXME: Finish GetUserNum()
FIXME: Finish GetUserNum()
FIXME: Finish ComputeAvg()
Avg: -1

#include <iostream>
using namespace std;

/* Your solution goes here  */

int GetUserNum();
int ComputeAvg();

int FunctionName(int argc, char ** v )
{
   GetUserNum();
   ComputeAvg();
   return 0;
}

int GetUserNum()
{
   cout << "FIXME: Finish GetUserNum()" << endl;
   return -1;
}

int ComputeAvg()
{
   cout << "FIXME: Finish ComputeAvg()" << endl;
   return -1;
}
 /* my solution ^ ^ ^ */

int main() {
   int userNum1 = 0;
   int userNum2 = 0;
   int avgResult = 0;

   userNum1 = GetUserNum();
   userNum2 = GetUserNum();

   avgResult = ComputeAvg(userNum1, userNum2);

   cout << "Avg: " << avgResult << endl;

   return 0;
}

output:

main.cpp: In function ‘int main()’:
main.cpp:42:45: error: too many arguments to function ‘int ComputeAvg()’
main.cpp:27:5: note: declared here

 

[Greg]

In the prototype for[m]ComputeAvg()[/m] you need [m]int ComputeAvg(int arg1, int arg2)[/m]. The names for the variables don't necessarily have to be [m]arg1[/m] and [m]arg2[/m].

 

[dalexander015]

I am stuck on the same problem and am a bit confused as to how to do this. I have the stub function for GetUserNum done, but when I try and do ComputeAvg(userNum1,userNum2), the compiler tells me
"undefined reference to `ComputeAvg(int, int)'
collect2: error: ld returned 1 exit status"