/in/foo.cc: In function 'int main()':
/in/foo.cc:10:15: warning: comparison of constant '1000' with boolean expression is always true [-Wbool-compare]
   10 | else if(500<=m<1000)
      |         ~~~~~~^~~~~
/in/foo.cc:10:12: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   10 | else if(500<=m<1000)
      |         ~~~^~~
/in/foo.cc:12:16: warning: comparison of constant '1500' with boolean expression is always true [-Wbool-compare]
   12 | else if(1000<=m<1500)
      |         ~~~~~~~^~~~~
/in/foo.cc:12:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   12 | else if(1000<=m<1500)
      |         ~~~~^~~
/in/foo.cc:14:16: warning: comparison of constant '2000' with boolean expression is always true [-Wbool-compare]
   14 | else if(1500<=m<2000)
      |         ~~~~~~~^~~~~
/in/foo.cc:14:13: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   14 | else if(1500<=m<2000)
      |         ~~~~^~~
/in/foo.cc:16:11: warning: statement has no effect [-Wunused-value]
   16 | else (2000<=m);
      |      ~~~~~^~~~