Getting a build error in c++ - c++

Question

I am getting a weird C3681 error, keeps saying that an identifier cannot be found for one of my functions. I am very confused and have tried solutions found while using Google, but I cannot get it resolved. I would prefer not to use stl.
The error:
Error 1 error C3861: 'readTheStuff': identifier not found c:\users\xxxxxx\desktop\data structures\homework2\homework2\editor.cpp 38 1 Homework2
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int readFile(const char *fileName) {
ifstream myReadFile;
string line;
int i = 0;
myReadFile.open(fileName);
if (myReadFile.is_open()) {
while (!myReadFile.eof()) {
getline(myReadFile, line);
line += " "; //adds a space after every line
//cout << line << endl;
readTheStuff(line);
}
}
myReadFile.close();
return 0;
}
void readTheStuff(string command){
cout << command; //testing
}
int main(int argc, const char* argv[]){ //when they call, going to pass two parameters
if (argc > 2){
cout << "Error, more than one file given" << endl;
}
else if (argc < 2){
cout << "Error, no file given" << endl;
}
else if (argc == 2){
readFile(argv[1]);
}
}

Answer 1

You have to declare a function before you can call it. Either make a declaration of readTheStuff before readFile or, more simply, just move the whole function up above readFile

Answer 2

2 ways to fix this.
1.) Include the following line just underneath your #includes in editor.cpp
void readTheStuff(std::string command)
or include the following line in addition to your other #includes
#include "editor.h"
inside editor.h the following line would need to appear
void readTheStuff(string command)
This is called prototyping and allows the compiler to link readTheStuff(line) to the actual function reaTheStuff(string command).