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Home/ Questions/iso c++ forbids declaration of with no type - How to solve it?
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Litzy Nolan
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Litzy Nolan
Asked: July 10, 20222022-07-10T04:21:38+00:00 2022-07-10T04:21:38+00:00In: Error

iso c++ forbids declaration of with no type – How to solve it?

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Hi expert. I’m writing these words to ask for everyone’s help. I get the message: iso c++ forbids declaration of with no type, but I don’t know the way to fix it. 

[[email protected] ircservices]$ g++ main.cpp -o services
In file included from main.cpp:1:0:
services.h:8:15: error: ISO C++ forbids declaration of âserivcesâ with no type [-fpermissive]

used by the compiler (with g++)

main.cpp:

#include "services.h"

#include <iostream>
using namespace std;

int main(int ac, char **av)
{
services myservices;

if(myservices.startup() == 1)
cout << "Cool this works!!" << endl;

return(0);
}

services.h:

#ifndef SERVICES_H
#define SERVICES_H

class services
{

public:
serivces();
~services();
int startup();
};

#endif

services.cpp:

#include "services.h"

services::services()
{
}

services::~services()
{
}

int services::startup()
{
return 1;
}

Please help me. Thank you very much.

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    dttutoria Expert
    2022-07-10T04:42:13+00:00Added an answer on July 10, 2022 at 4:42 am

    The cause: 

    In response to your second update,

    This is the cause of your issue: iso c++ forbids declaration of with no type. You likely overlooked the creation of the object file, which is a compilation step:

    Solution:

    Step 1:

    g++ -c services.cpp

    This will produce the object file which you can do for linking, the final step:

    g++ main.cpp services.cpp -o executablename

    Since you were essentially pasting the complete code into the main during pre-processing, including the .cpp files in the main fixes the issue.

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