[lug] help

[heero yui]

I am having a problem with a C++ program using   findMax() .
  
I am only copying it out of the book and I did it exactly the same, but the linker still gives me this error:
  
a:\61.o(.text+0xb1):61.cpp: undefined reference to `findMax(int, int)'

Could you please tell me how to fix this program?
  
  
Also here is the program...
  
#include <iostream.h>
#include <stdio.h>

void findMax(int, int);  // the function declaration (prototype)
  
int main(int argc, char *argv[])
{
   
  int firstnum, secnum;
  
  cout << "\nEnter a number: ";
  cin >> firstnum;
  cout << "Great! Please enter a second number: ";
  cin >> secnum;
   
  findMax(firstnum, secnum); // the function is called here

  return 0;
}
  
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