fork download
copy 
  1. class Helloworld{
  2.   public:
  3.      static int x;
  4.      void foo();
  5. };
  6.  
  7. // uncomment to fix
  8. //int Helloworld::x;
  9.  
  10. void Helloworld::foo(){
  11.      Helloworld::x = 10;
  12. };
  13.  
  14. int main() {
  15. 	return 0;
  16. }
Compilation error #stdin compilation error #stdout 0s 3336KB
comments (?)
stdin
copy 
Standard input is empty
compilation info 
/home/PBjAw9/ccefhKg5.o: In function `Helloworld::foo()':
prog.cpp:(.text+0x2): undefined reference to `Helloworld::x'
collect2: error: ld returned 1 exit status
stdout
copy 
Standard output is empty
https://ideone.com/oyLOag
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!