foo.cc: In function 'int fen(int)':
foo.cc:6:2: error: 'ge' was not declared in this scope
    6 |  ge=temp%10;
      |  ^~
foo.cc:7:2: error: 'shi' was not declared in this scope
    7 |  shi=temp/10%10;
      |  ^~~
foo.cc:8:2: error: 'bai' was not declared in this scope
    8 |  bai=temp/100%10;
      |  ^~~

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