/in/foo.cc: In function 'int main()':
/in/foo.cc:7:6: warning: comparison of constant '50' with boolean expression is always true [-Wbool-compare]
    7 |  1<=n<=50;
      |  ~~~~^~~~
/in/foo.cc:7:3: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    7 |  1<=n<=50;
      |  ~^~~
/in/foo.cc:7:6: warning: statement has no effect [-Wunused-value]
    7 |  1<=n<=50;
      |  ~~~~^~~~