undefined reference Static Member C++ [duplicate]

Question

I have a code like this. When run, it's return fault: undefined reference to A::x. How can I fix this?

#include <iostream> using namespace std; class A { private: static int x; public: A(){ } A(int t) { x = t; } static void f() { cout<< A::x; } int f2() { return x; } }; int main() { A::f(); A a; a.f2(); }

Linking code from external hosts is not allowed. Minimal, valid and verifiable sample code, that represents your specific problem, must be included as part of the question. — Mateusz Grzejek
– Mateusz Grzejek, Commented Aug 18, 2015 at 1:59
you only declared static variable, static variable also should be defined out side of your class.(i.e) int A::x = some_value; your trying to modify static in your code. — BEPP
– BEPP, Commented Aug 18, 2015 at 1:59

Nishant · Accepted Answer · 2015-08-18 02:11:49Z

0

You have only declared your static variable, not defined it.

Define it outside of the class using:

int A::x = 0;

answered Aug 18, 2015 at 2:11

Nishant

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Comments

Carlton · Accepted Answer · 2015-08-18 02:10:58Z

You need to add

int A::x = 0; //Or any other value

somewhere outside your class declaration.

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