extern int a, b, c; int main() { return a + b + c; }
Standard input is empty
/home/CPCz1j/ccrst43X.o: In function `main': prog.cpp:(.text.startup+0x2): undefined reference to `b' prog.cpp:(.text.startup+0x8): undefined reference to `a' prog.cpp:(.text.startup+0xe): undefined reference to `c' collect2: error: ld returned 1 exit status
Standard output is empty