/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:48:40: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d/%d %d/%d\n", a, b, c, d);
                                        ^
/in/foo.cc:48:40: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:48:40: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:48:40: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]