foo.cc: In constructor ‘Complex::Complex()’:
foo.cc:9:23: warning: unused variable ‘re’ [-Wunused-variable]
    9 |         Complex(){int re=0,in=0;}
      |                       ^~
foo.cc:9:28: warning: unused variable ‘in’ [-Wunused-variable]
    9 |         Complex(){int re=0,in=0;}
      |                            ^~

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