if (course_select == "ACC 225" || "acc 225" || "acc 225"|| "Acc 225"|| "225")course_select in each time you do an or; it's not implicit. |
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course_select == "ACC 225" returns a boolean, but when you get to "acc 225", it is a string, whose first value is the ASCII letter 'a' which is NOT 0. Therefore, that evaluates to true or (rather) non-0.