Error: Redefinition of Class (C++)

Question

I'm trying to figure out why I'm getting the following error:

error: redefinition of 'TimeDuration'

// TimeDuration.cpp

#define HOUR 3600
#define MIN 60

#include <iostream>
#include <string>
#include "TimeDuration.h"

using namespace std;

TimeDuration::TimeDuration() {
    seconds = 0;
}

void TimeDuration::setDuration(const int sec) {
    seconds = sec;
}

void TimeDuration::display() {
    // Some code to display the time
}

The error is showing in my header file.

// TimeDuration.h

class TimeDuration {
    private:
        int seconds;
    public:
        TimeDuration();                     
        void setDuration(const int sec);    
        void display();                     
};

Have you got header guards in place? Post the exact compiler error output if you can — mathematician1975, Nov 25 '15 at 00:24
./TimeDuration.h:5:7: error: redefinition of 'TimeDuration' class TimeDuration { — anonymous, Nov 25 '15 at 00:30
./TimeDuration.h:5:7: note: previous definition is here class TimeDuration { — anonymous, Nov 25 '15 at 00:30
@raychul, clarify, is that your complete TimeDuration.h file? If so you need to add header gaurds. — Ethan Fine, Nov 25 '15 at 00:31
Alright, I'm not really familiar with headers guards, but I'll look it up. Thanks! — anonymous, Nov 25 '15 at 00:32
Probably you have not got header guards and have included that header in multiple files???? If so Google header guards and why you need them. — mathematician1975, Nov 25 '15 at 00:33
Thanks! I added header guards and everything works perfectly now. — anonymous, Nov 25 '15 at 00:37

score 3 · Accepted Answer · answered Nov 25 '15 at 00:37

3

The error is probably because you don't have header guards in TimeDuration.h

A standard way to header guard is to at the beginning of the file write:

#ifndef TIME_DURATION_H
#define TIME_DURATION_H

and at the end of the file:

#endif

answered Nov 25 '15 at 00:37

Ethan Fine

519
3
8

score 0 · Answer 2 · answered Jan 13 '23 at 10:20

0

you can use

#pragma once

in your TimeDuration.h file , at the starting

answered Jan 13 '23 at 10:20

Divyansh undley

33
5

Error: Redefinition of Class (C++)

2 Answers2

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