Home/ Questions/How to fix: ''unresolved external symbol c++'' error ?
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domenicalindgren
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Asked: 2022-06-08T15:17:53+00:00 In:

How to fix: ”unresolved external symbol c++” error ?

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Hey, geys! I’m back here. I am facing with the error: ”unresolved external symbol c++”  and I want to ask for your help. Let’s consider the following C++ program which I run:

#include <iostream>
int func1();
int main()
{
     
    func1();
}
Output
/tmp/cc3qLnFB.o: In function 'main':
main.cpp: (.text+0×5): undefined reference to 'func1()'
collect2: error: ld returned 1 exist status
Then it gives me a warning message:
Error: undefined reference/unresolved external symbol errors in C++
I have thought this problem for some days, but I don’t find the answer. I don’t know where the mistake is and how to fix it. Does anyone have suggestions for me?
unresolved external symbol errors in c++
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1 Answer

  1. Best Answer
    Expert

    The cause:

    This error happens because you are missing the definition for the object. Perhaps you forgot it.

    Solution:

    To fix this error, you need to give the definition of the function func1 for the program as below:

    #include <iostream>
using namespace std;
int func1();

int main()
{

func1();
}
int func1(){
cout<<"hello, world!!";
}

    Output:

    hello, world!!

    If you do this way, your problem will be solved.

    • 12

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