foo.cc: In function 'void Div(int, int)':
foo.cc:52:7: warning: unused variable 'b1' [-Wunused-variable]
   52 |   int b1=x1,b2=x2;
      |       ^~
foo.cc:52:13: warning: unused variable 'b2' [-Wunused-variable]
   52 |   int b1=x1,b2=x2;
      |             ^~
foo.cc:43:19: warning: unused variable 'k' [-Wunused-variable]
   43 |  int i=0,ys=0,t=0,k=0;
      |                   ^
foo.cc:44:6: warning: unused variable 'zs' [-Wunused-variable]
   44 |  int zs=x1/x2;
      |      ^~

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