C++ : "undefined reference to WeightCalc::getHeavier(int)"

Question

I have the following classes detailed below: (I am programming in Arduino language which is basically C++)

Weight_Tester_main.cpp :

#include "Weight_Tester_main.h"
#include "weightcalc.h"

WeightCalc weight;


int PotPin = A0;
int PotVal = 0;
int ALED = 12;
int BLED = 13;


void setup() {
    Serial.begin(9600);
    pinMode(ALED, OUTPUT);
    pinMode(BLED, OUTPUT);
    pinMode(btnPin, INPUT); 
    Serial.println("Setup complete. Both LEDs have been configured as outputs.                The button has been set.");
    delay(500);
}

 void loop() {
    PotVal = analogRead(PotPin);
    Serial.println(weight.getHeavier(PotVal));
}

Weight_Tester_main.h:

//-------------------------------------------------------------------
#ifndef __weight_tester_main_H__
#define __weight_tester_main_H__
//-------------------------------------------------------------------

#include <arduino.h>

//-------------------------------------------------------------------

//-------------------------------------------------------------------

void setup();
void loop();

 //-------------------------------------------------------------------

//===================================================================
// -> DO NOT WRITE ANYTHING BETWEEN HERE...
//      This section is reserved for automated code generation
//      This process tries to detect all user-created
//      functions in main_sketch.cpp, and inject their  
//      declarations into this file.
//      If you do not want to use this automated process,  
//      simply delete the lines below, with "&MM_DECLA" text 
//===================================================================
//---- DO NOT DELETE THIS LINE -- @MM_DECLA_BEG@---------------------
void loop();
void setup();
//---- DO NOT DELETE THIS LINE -- @MM_DECLA_END@---------------------
// -> ...AND HERE. This space is reserved for automated code generation!
//===================================================================


//-------------------------------------------------------------------
#endif
//-------------------------------------------------------------------

weightcalc.cpp:

#include "weightcalc.h"

int getHeavier (int Value) {

digitalWrite(13,LOW);
digitalWrite(12,LOW);

// Ready to go boolean

boolean readytogo = true;

// Here, we know Value is the Pot's Value which our main program is going to pass to us
// So we check it for a certain value

Value = 512 ? Serial.println("Perfect!") : Serial.println("Not exact, but who cares as long as its between our range.");

if (Value > 500 && Value < 530) {

    Serial.println(" We are good to go!");
    readytogo = true;
    delay(2000);
    Serial.println("Please put the objects in each of the containers.");
    delay(20000);
}


else {

    readytogo = false;
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);


}

if (!readytogo) {

    Serial.println("Aborting......");
    return -1;
}

else {

    ;

}

int newValue = analogRead(A0);



if (newValue < 500) {

    Serial.println ("A is heavier."); 
    digitalWrite(13, LOW);
    digitalWrite(12, HIGH);
    return 0;

}

else if (newValue > 530) {
    Serial.println("B is heavier.");
    digitalWrite(13, HIGH);
    digitalWrite(12, LOW);
    return 1;

}

else {
    Serial.println("They are both about the same weight.");

    return 2;
}

}

weightcalc.h:

//-------------------------------------------------------------------
#ifndef __weightcalc_H__
#define __weightcalc_H__
//-------------------------------------------------------------------

#include <arduino.h>

//-------------------------------------------------------------------

//-------------------------------------------------------------------

class WeightCalc{
public:
int getHeavier(int Value);
};



//-------------------------------------------------------------------

//===================================================================
// -> DO NOT WRITE ANYTHING BETWEEN HERE...
//      This section is reserved for automated code generation
//      This process tries to detect all user-created
//      functions in main_sketch.cpp, and inject their  
//      declarations into this file.
//      If you do not want to use this automated process,  
//      simply delete the lines below, with "&MM_DECLA" text 
//===================================================================
//---- DO NOT DELETE THIS LINE -- @MM_DECLA_BEG@---------------------
//---- DO NOT DELETE THIS LINE -- @MM_DECLA_END@---------------------
// -> ...AND HERE. This space is reserved for automated code generation!
//===================================================================


//-------------------------------------------------------------------
#endif
//-------------------------------------------------------------------

And I get the error you see in the title. I am using the MariaMole IDE. I'm sorry this is mostly code but I wanted to show everything so that you can help.

You're using [reserved identifiers](http://stackoverflow.com/questions/228783/what-are-the-rules-about-using-an-underscore-in-a-c-identifier). — chris, Jun 05 '14 at 17:29
Your question is answered in the linked duplicate [here](https://stackoverflow.com/a/12574407/241631) (*A common mistake is forgetting to qualify the name*) — Praetorian, Jun 05 '14 at 17:32

score 1 · Accepted Answer · answered Jun 05 '14 at 17:30

1

Shouldn't you specify WeightCalc::getHeavier(int) instead of just getHeavier(int) at the top of weightCalc.cpp? Looks like you didn't implement the declared function from the class. That one is globally defined.

answered Jun 05 '14 at 17:30

user3712302

26
1

Thanks! I do not know much C++ so I'll remember this! – Jun 06 '14 at 04:11

C++ : "undefined reference to WeightCalc::getHeavier(int)"

1 Answers1