foo.cc: In function 'int main()':
foo.cc:7:6: warning: unused variable 'True' [-Wunused-variable]
    7 |  int True=3,False=1;
      |      ^~~~
foo.cc:7:13: warning: unused variable 'False' [-Wunused-variable]
    7 |  int True=3,False=1;
      |             ^~~~~
foo.cc:8:6: warning: unused variable 'A1' [-Wunused-variable]
    8 |  int A1=0,A2=0;
      |      ^~
foo.cc:8:11: warning: unused variable 'A2' [-Wunused-variable]
    8 |  int A1=0,A2=0;
      |           ^~
foo.cc:9:6: warning: unused variable 'B1' [-Wunused-variable]
    9 |  int B1=0,B2=0;
      |      ^~
foo.cc:9:11: warning: unused variable 'B2' [-Wunused-variable]
    9 |  int B1=0,B2=0;
      |           ^~
foo.cc:10:6: warning: unused variable 'C1' [-Wunused-variable]
   10 |  int C1=0,C2=0;
      |      ^~
foo.cc:10:11: warning: unused variable 'C2' [-Wunused-variable]
   10 |  int C1=0,C2=0;
      |           ^~
foo.cc:11:6: warning: unused variable 'D1' [-Wunused-variable]
   11 |  int D1=0,D2=0;
      |      ^~
foo.cc:11:11: warning: unused variable 'D2' [-Wunused-variable]
   11 |  int D1=0,D2=0;
      |           ^~

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