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  1. int main ()
  2. {
  3.     extern int foo();
  4.     return foo();
  5. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
/home/VhdGV2/cc5qK0i6.o: In function `main':
prog.cpp:(.text.startup+0x7): undefined reference to `foo()'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/QGqzQG
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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