foo.cc: In function 'int main()':
foo.cc:7:11: warning: comparison of constant '1000' with boolean expression is always true [-Wbool-compare]
    7 | while(2<=n<1000)
      |       ~~~~^~~~~
foo.cc:7:8: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    7 | while(2<=n<1000)
      |       ~^~~

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