/in/foo.cc: In function 'int main()':
/in/foo.cc:25:31: warning: comparison of constant '85' with boolean expression is always false [-Wbool-compare]
   if(stu[i].class_scores > 80 > 85 && stu[i].student_cadre == 'Y') stu[i].scholarship += 850;
                               ^
/in/foo.cc:25:26: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   if(stu[i].class_scores > 80 > 85 && stu[i].student_cadre == 'Y') stu[i].scholarship += 850;
                          ^