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  1. #include <iostream>
  2.  
  3. extern int i; // Only declaration
  4.  
  5. int func() 
  6. {
  7.     if (i)
  8.         return i;
  9.     else
  10.         return -1;
  11. }
  12.  
  13. int main() 
  14. {
  15.     int ret = func();
  16.     std::cout<<"Ret : "<<ret<<std::endl;
  17. }
Compilation error #stdin compilation error #stdout 0s 16064KB
comments (?)
stdin
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Standard input is empty
compilation info 
/home/R77EVE/ccd6n643.o: In function `func()':
prog.cpp:(.text+0x2): undefined reference to `i'
/home/R77EVE/ccd6n643.o: In function `main':
prog.cpp:(.text.startup+0x3): undefined reference to `i'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/NjEqoy
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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