Error using Qt Creator:"multiple definition" "first defined here"

Question

I have a problem. In my Qt project I'm having an error. Tt says:

multiple definition of estructura

I think it is because I'm using too many "#includes", but I don't know how to fix it.

This is my program:

Struct.h

 #ifndef STRUCT_H #define STRUCT_H #include <stdio.h> #include <string> struct Circulo{ std::string nombre; int capacidad; int statusMujer[4]; int hijos[4]; }; struct Circulo estructura[30]; #endif // STRUCT_H

Logica.h

 #ifndef LOGICA_H #define LOGICA_H #include <iostream> void madresStatusCodificados(std::string , int , int[]); void ListadoDeCirculos(int, int , std::string []); std::string CirculoMayorCapacidad(int ); int NinnosEnCirculosconStatus(int , int ); void Listado(int); #endif // LOGICA_H

interfaz.cpp

#include <Interfaz/Interfaz.h> #include <Logica/Defecto.h> #include <Interfaz/Menu.h> #include <Logica/Struct.h> #include <iostream> using namespace std; void Principal(){ cin>>estructura[i].statusMujer[3]; cout<<"Escriba la cantidad de hijos con madres desconocidas"<<endl; cin>>estructura[i].hijos[3]; i++; }else{ break; } } }

Logica.cpp

#include <iostream> using namespace std; //#include <Logica/Logica.h> #include <Logica/Struct.h> void madresStatusCodificados(string t, int h , int k[]){ for(int i=0;i<h;i++){ if(estructura[i].nombre==t){ k[0]=estructura[i].statusMujer[0]; k[1]=estructura[i].statusMujer[1]; k[2]=estructura[i].statusMujer[2]; k[3]=estructura[i].statusMujer[3]; } } } void ListadoDeCirculos(int g,int u,string h[]){ for(int i=0;i<u;i++){ if(estructura[i].statusMujer[g-1]!=0) h[i]=estructura[i].nombre; } } string CirculoMayorCapacidad(int k){ int n=-1; string l; for(int i=0;i<k;i++){ if(estructura[i].capacidad>n){ n=estructura[i].capacidad; l=estructura[i].nombre; } } return l; } int NinnosEnCirculosconStatus(int a,int b){ int h=0; for(int i=0;i<b;i++){ h=h+estructura[i].hijos[a-1]; } return h; } void Listado(int y){ for(int i=0;i<y;i++){ cout<<"NOMBRE DEL CIRCULO CAPACIDAD Madres solteras Madres trabajadoras Madres caso social Madres desconocidas "<<endl; cout<<estructura[i].nombre<<""<<estructura[i].capacidad<<estructura[i].statusMujer[0]<<estructura[i].statusMujer[1]<<estructura[i].statusMujer[2]<<estructura[i].statusMujer[3]<<endl; } }

I am getting this error: Errors

idownvotedbecau.se/imageofanexception, and no pointer from you which line causes the error. Also idownvotedbecau.se/nomcve — Murphy
– Murphy, Commented Dec 30, 2017 at 9:42

Immac · Accepted Answer · 2017-12-27 22:26:12Z

You have defined a variable named "estructura" in several files, the error tells you that it was first defined in Struct.h being called #included in Logica.cpp,

struct Circulo estructura[30];

you have another definition the the file Defecto.h or a file included by Defecto.h

p-a-o-l-o · Accepted Answer · 2017-12-28 08:18:36Z

2

Move the definition of estructura in a cpp file of your choice, then declare it as extern wherever you need it. And you can omit the struct keyword, in c++.

In a struct.cpp file:

#include "Struct.h" Circulo estructura[30];

In your Logica.cpp and Interfaz.cpp files:

#include "Struct.h" extern Circulo estructura[30];

Here is a long and detailed explanation of your issue.

edited Dec 28, 2017 at 8:18

answered Dec 27, 2017 at 22:39

p-a-o-l-o

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3 Comments

cristian sori Over a year ago

Do you mean,put the estructura declaration in a .cpp file,and declare this declaration as extern??Thanks in advance

cristian sori Over a year ago

Already did that,so,now,do i have to declare estructura in all .cpp files?Thanks in advance

p-a-o-l-o Over a year ago

I edited the answer to better explain what you have to do. Please read the answer in the link I provided to understand why you have to do so.

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