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POMy makefile isn't working
 

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    <p>I'm new to C++, switching over from Java for a class I'm taking in college. In our first assignment we have to write several makefiles for our code. My first makefile isn't working - it always complains about an error in "TempControlTest: undefined reference to 'BangBangControl::XXXX', where XXXX a function in BangBangControl (I get errors for every function in BangBangControl). I've been looking around online and all the makefile examples look slightly different so I can't tell what I'm doing wrong. I'll post all my code below, if anyone could just give me a little help, that would be AWESOME. Also, this is due tonight, so any quick help is appreciated so much. If you're still here, thanks very much!</p> <p>HeatingUnit.h:</p> <pre><code>#ifndef HEATINGUNIT_H #define HEATINGUNIT_H class HeatingUnit { private: bool on; int temp; public: HeatingUnit(bool o, int t); void turnOn(); void turnOff(); int tick(); }; #endif </code></pre> <p>HeatingUnit.cpp:</p> <pre><code>#include "HeatingUnit.h" HeatingUnit::HeatingUnit(bool o, int t) { on = o; temp = t; } void HeatingUnit::turnOn() { on = true; } void HeatingUnit::turnOff() { on = false; } int HeatingUnit::tick() { if(on) return ++temp + 1; else return --temp; } </code></pre> <p>BangBangControl.h:</p> <pre><code>#ifndef BANGBANGCONTROL_H #define BANGBANGCONTROL_H #include "HeatingUnit.h" class BangBangControl { private: int tempToKeep; HeatingUnit unit; public: BangBangControl(int ttk, bool on, int initTemp); void setTemp(int t); int getTemp(); void update(); }; #endif </code></pre> <p>BangBangControl.cpp:</p> <pre><code>#include "HeatingUnit.h" #include "BangBangControl.h" BangBangControl::BangBangControl(int ttk, bool on, int initTemp) : unit(on, initTemp) { tempToKeep = ttk; } void BangBangControl::setTemp(int t) { tempToKeep = t; } int BangBangControl::getTemp() { return tempToKeep; } void BangBangControl::update() { int currentTemp = unit.tick(); if(currentTemp &gt; tempToKeep + 2) unit.turnOff(); else if(currentTemp &lt; tempToKeep - 2) unit.turnOn(); } </code></pre> <p>TempControlTest.cpp:</p> <pre><code>include &lt;iostream&gt; #include "BangBangControl.h" using namespace std; int main() { BangBangControl bang(100, false, 60); for(int i = 0; i &lt; 50; i++) { bang.update(); cout &lt;&lt; bang.getTemp() &lt;&lt; " "; if(i % 10 == 9) cout &lt;&lt; endl; } } </code></pre> <p>And finally, Makefile_Executable:</p> <pre><code>all: TempControlTest TempControlTest: TempControlTest.cpp BangBangControl.o g++ -o TempControlTest TempControlTest.cpp BangBangControl.o: BangBangControl.cpp HeatingUnit.o g++ -c BangBangControl.cpp HeatingUnit.o: HeatingUnit.cpp g++ -c HeatingUnit.cpp clean: rm -rf *.o TempControlTest </code></pre> <p>Again, thank you very much!</p>
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