/in/foo.c: In function 'main':
/in/foo.c:7:8: warning: comparison of constant '100' with boolean expression is always true [-Wbool-compare]
  if(1<n<100){x=n;}
        ^
/in/foo.c:7:6: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(1<n<100){x=n;}
     ~^~
/in/foo.c:14:2: warning: implicit declaration of function 'system' [-Wimplicit-function-declaration]
  system("pause");
  ^~~~~~