/in/foo.cc: In function 'int main()':
/in/foo.cc:10:9: warning: comparison of constant '1000' with boolean expression is always true [-Wbool-compare]
  if(99<m<1000)
     ~~~~^~~~~
/in/foo.cc:10:7: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(99<m<1000)
     ~~^~
/in/foo.cc:9:8: warning: 'b' is used uninitialized in this function [-Wuninitialized]
  m=a+10*b+100*c;
      ~~^~
/in/foo.cc:9:5: warning: 'a' is used uninitialized in this function [-Wuninitialized]
  m=a+10*b+100*c;
    ~^~~~~
/in/foo.cc:9:14: warning: 'c' is used uninitialized in this function [-Wuninitialized]
  m=a+10*b+100*c;
           ~~~^~