/in/foo.cc: In function 'int main()':
/in/foo.cc:8:9: warning: comparison of constant '100' with boolean expression is always true [-Wbool-compare]
  if(1<=x<=100) cout<<pow(x,3);
     ~~~~^~~~~
/in/foo.cc:8:6: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(1<=x<=100) cout<<pow(x,3);
     ~^~~