foo.cc: In function 'int Mod(int)':
foo.cc:51:10: warning: statement has no effect [-Wunused-value]
   51 |     for (i; i >= 0; i--)
      |          ^
foo.cc: In function 'void Outc2()':
foo.cc:83:10: warning: statement has no effect [-Wunused-value]
   83 |     for (i; i >= 0; i--)
      |          ^
foo.cc: In function 'void Output()':
foo.cc:98:15: warning: unused variable 'counta' [-Wunused-variable]
   98 |     int L, R, counta = 0;
      |               ^~~~~~

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